Given that radioactivity levels across Canada continue to be within normal background levels and that there is no cause for concern, on Thursday, August 11, 2011 Health Canada removed nine supplementary fixed point detectors that were installed in British Columbia and the Yukon in response to the Fukushima nuclear incident. In addition, on September 15, 2011, Health Canada will end its weekly data postings, resuming its previous schedule of quarterly postings of the fixed point network data and terminating Website Comprehensive Nuclear Test-Ban Treaty (CTBT) data reporting. Please note that Health Canada will maintain its continuous monitoring of radiation levels and daily review of data. Should there be changes in the situation in Japan; the reporting frequency of radiation data will be reassessed.
As part of routine operations, Health Canada's Radiation Protection Bureau monitors radiation levels across Canada 24/7 through networks of stations which measure radioactivity in air, water and other environmental samples (see Health Canada's pages on Environmental Radiation for a detailed description of these networks.
In response to the Japan nuclear incident, data from two of these networks comprising more than 100 radiation monitoring stations has been made available online. Measurements from these networks have confirmed that the quantities of radioactive materials that reached Canada as a result of the Japanese nuclear incident were very small and did not pose any health risk to Canadians. The very slight increases in radiation across the country, observed during the first few weeks following the onset of the incident, were smaller than the normal day to day fluctuations from background radiation. An overview of these networks and their data are provided below.
The first network (Fixed Point Network - FPS) measures radiation levels in air in real time. The summaries from this network provide an indication of the amount of radiation in the vicinity of the monitoring stations, including both natural background radiation as well as radionuclides from the damaged reactors that may have been carried by the wind. The dose data for March to August 2011 is available online. Routine data from this network, reported on a monthly basis, is also available.
The second network (which includes Canadian stations part of the global Comprehensive Nuclear Test Ban Treaty monitoring network - CTBT) can detect much lower quantities of radioactivity in air, but not in real time. The monitoring stations in this network collect air over 24-hour sampling periods so that any radioisotopes present in the samples can be measured at much lower levels by gamma radiation detectors. This network detected the first radioactive isotopes in Canada coming from the damaged Japanese reactors, in Sidney, BC. While data from this network is not routinely reported, in response to the nuclear incident in Japan, the data for March to August 2011 is also available online.
All monitoring stations in these networks are extremely sensitive and capable of detecting minute quantities of radioactivity as well as identifying a broad range of individual radionuclides. However, Health Canada only reports online the results for the principal radionuclides of interest in assessing radiation dose, as well as data for 133Xe.
Daily data for March and April are available online. Given that no elevated levels of radiation associated with the damaged reactors were observed after the first few weeks of the emergency, that no additional significant radioactive releases from the damaged Japanese reactors occurred, and that the levels of radiation across Canada continued to be within normal background levels, Health Canada changed the frequency of data publishing from all monitoring networks on the Website to a single day, once a week starting the first week in May. This weekly report includes a single daily dose calculated mid week from FPS monitoring stations across Canada (as listed in the currently posted charts), as well as the data on the concentration of radioisotopes in the air from the CTBT stations (as listed in the currently posted charts).
On September 15, 2011, Health Canada will end its weekly data postings, resuming its previous schedule of quarterly postings of the fixed point data and terminating Website CTBT data reporting. These changes are being made as radiation levels across Canada are within normal background levels and there is no cause for concern. Please note that Health Canada will continue to closely monitor the situation in Japan and review data received from the monitoring systems in Canada on a daily basis. If the situation changes, Health Canada will reassess the frequency of reporting.
Although there is only a slight increase in the level of radioactivity measured, it is possible to identify the radioisotopes in the radiation. This allows Health Canada to verify that the incident in Japan is the source of the isotopes. For example, xenon was detected on the west coast. Xenon is an isotope produced from a nuclear reactor.
Summary: Data received is as expected and does not pose a health risk to Canadians. Even though the data table does not show an increase over and above the normal day to day fluctuations, further identification of the radioactive material revealed very minute levels of isotopes which are indicative of the release in Japan. The actual dose increase in radiation measured was 0.0005µSv, which is so small that you cannot discern it from the background.
Station | P/T | Baseline (2010) | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Min | Average | Max | |||||||||||||
x dose data for this date was not collected due to problems with equipment or data transfer | |||||||||||||||
Calgary | AB | 0.28 | 0.48 | 0.64 | 0.45 | 0.48 | 0.46 | 0.44 | 0.43 | 0.42 | 0.44 | 0.48 | 0.43 | 0.45 | 0.48 |
Sidney | BC | 0.12 | 0.38 | 0.57 | 0.36 | 0.36 | 0.37 | 0.37 | 0.31 | 0.37 | 0.36 | 0.36 | 0.39 | 0.42 | 0.37 |
Victoria | BC | 0.21 | 0.23 | 0.35 | 0.23 | 0.22 | 0.22 | 0.23 | 0.25 | 0.23 | 0.23 | 0.22 | 0.23 | 0.26 | 0.24 |
Vancouver | BC | 0.07 | 0.44 | 0.59 | 0.42 | 0.42 | 0.42 | 0.43 | 0.43 | 0.44 | 0.42 | 0.41 | 0.43 | 0.50 | 0.44 |
Nanaimo | BC | 0.08 | 0.35 | 0.49 | 0.35 | 0.34 | 0.36 | 0.41 | 0.37 | 0.38 | 0.34 | 0.34 | 0.37 | 0.39 | 0.35 |
Winnipeg | MB | 0.31 | 0.38 | 1.06 | 0.32 | 0.32 | 0.32 | 0.29 | 0.31 | 0.32 | 0.34 | 0.34 | 0.30 | 0.31 | 0.39 |
Saint John | NB | 0.56 | 0.68 | 0.78 | 0.66 | 0.66 | 0.69 | 0.68 | 0.68 | 0.67 | 0.67 | 0.68 | 0.70 | 0.68 | 0.68 |
St. John's | NL | 0.49 | 0.68 | 0.76 | 0.61 | 0.61 | 0.62 | 0.64 | 0.67 | 0.54 | 0.54 | 0.57 | 0.63 | 0.65 | 0.62 |
Digby | NS | 0.17 | 1.10 | 1.20 | 1.07 | 1.08 | 1.10 | 1.09 | 1.08 | x | 1.08 | 1.09 | 1.10 | 1.09 | 1.08 |
Halifax | NS | 0.10 | 0.80 | 0.92 | 0.80 | 0.81 | 0.82 | 0.82 | 0.79 | 0.78 | 0.81 | 0.81 | 0.83 | 0.82 | 0.81 |
Yellowknife | NWT | 0.20 | 0.85 | 1.02 | 0.57 | 0.55 | 0.58 | 0.58 | 0.60 | 0.59 | 0.56 | 0.56 | 0.57 | 0.57 | 0.56 |
Amherstburg | ON | 0.42 | 0.54 | 0.84 | 0.52 | 0.52 | 0.50 | 0.51 | 0.49 | 0.52 | 0.56 | 0.53 | 0.54 | 0.52 | 0.53 |
Thunder Bay | ON | 0.39 | 0.46 | 1.04 | 0.40 | 0.43 | 0.41 | 0.40 | 0.41 | 0.42 | 0.42 | 0.49 | 0.42 | 0.41 | 0.47 |
Kincardine | ON | 0.26 | 0.36 | 0.68 | 0.44 | 0.44 | 0.34 | 0.33 | 0.28 | 0.29 | 0.37 | 0.34 | 0.38 | 0.34 | 0.34 |
Toronto | ON | 0.08 | 0.28 | 0.53 | 0.31 | 0.34 | 0.25 | 0.29 | 0.24 | 0.24 | 0.30 | 0.27 | 0.27 | 0.25 | 0.25 |
Port Hope | ON | 0.02 | 0.57 | 0.98 | 0.63 | 0.62 | 0.55 | 0.58 | 0.54 | 0.54 | 0.59 | 0.56 | 0.57 | 0.55 | 0.54 |
Pickering | ON | 0.47 | 0.53 | 0.82 | 0.55 | 0.58 | 0.48 | 0.52 | 0.48 | 0.48 | 0.56 | 0.50 | 0.51 | 0.49 | 0.49 |
Oshawa | ON | 0.44 | 0.49 | 0.87 | 0.57 | 0.53 | 0.46 | 0.49 | 0.45 | 0.46 | 0.53 | 0.47 | 0.48 | 0.46 | 0.46 |
Markham | ON | 0.14 | 0.54 | 0.84 | 0.58 | 0.60 | 0.50 | 0.54 | 0.50 | 0.50 | 0.57 | 0.52 | 0.53 | 0.51 | 0.51 |
Ottawa | ON | 0.16 | 0.40 | 0.57 | 0.35 | 0.33 | 0.31 | 0.32 | 0.33 | 0.34 | 0.36 | 0.36 | 0.40 | 0.37 | 0.38 |
Petawawa | ON | 0.39 | 0.64 | 0.89 | 0.42 | 0.41 | 0.36 | 0.39 | 0.38 | 0.37 | 0.38 | 0.39 | 0.47 | 0.51 | 0.47 |
Charlottetown | PEI | 0.46 | 0.54 | 0.68 | 0.46 | 0.46 | 0.49 | 0.51 | 0.49 | 0.49 | 0.50 | 0.51 | 0.57 | 0.51 | 0.51 |
Montréal | QC | 0.34 | 0.44 | 0.58 | 0.43 | 0.40 | 0.42 | 0.42 | 0.41 | 0.41 | 0.43 | 0.43 | 0.47 | 0.42 | 0.42 |
Trois-Rivières | QC | 0.04 | 0.35 | 0.98 | 0.22 | 0.18 | 0.18 | 0.16 | 0.16 | 0.16 | 0.18 | 0.17 | 0.24 | 0.20 | 0.20 |
Leprad | QC | 0.48 | 0.62 | 0.82 | 0.45 | 0.39 | 0.43 | 0.45 | 0.46 | 0.46 | 0.49 | 0.48 | 0.55 | 0.51 | 0.51 |
Regina | SK | 0.44 | 0.76 | 1.06 | 0.45 | 0.45 | 0.34 | 0.38 | 0.40 | 0.35 | 0.41 | 0.36 | 0.36 | 0.38 | 0.37 |
Station | P/T | Baseline (2010) | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Min | Average | Max | |||||||||||||
x dose data for this date was not collected due to problems with equipment or data transfer | |||||||||||||||
Calgary | AB | 0.28 | 0.48 | 0.64 | 0.48 | 0.45 | 0.46 | 0.44 | 0.45 | 0.48 | 0.46 | 0.44 | 0.45 | 0.44 | 0.44 |
Sidney | BC | 0.12 | 0.38 | 0.57 | 0.44 | 0.37 | 0.37 | 0.37 | 0.42 | 0.37 | 0.37 | 0.37 | 0.37 | 0.36 | 0.36 |
Victoria | BC | 0.21 | 0.23 | 0.35 | 0.29 | 0.23 | 0.23 | 0.24 | 0.26 | 0.23 | 0.23 | 0.23 | 0.23 | 0.23 | 0.23 |
Vancouver | BC | 0.07 | 0.44 | 0.59 | 0.51 | 0.43 | 0.42 | 0.43 | 0.45 | 0.44 | 0.45 | 0.43 | 0.44 | 0.47 | 0.43 |
Nanaimo | BC | 0.08 | 0.35 | 0.49 | 0.38 | 0.35 | 0.34 | 0.35 | 0.37 | 0.35 | 0.35 | 0.35 | 0.35 | 0.34 | 0.34 |
Winnipeg | MB | 0.31 | 0.38 | 1.06 | 0.34 | 0.32 | 0.32 | 0.32 | 0.33 | 0.32 | 0.32 | 0.33 | 0.33 | 0.33 | 0.35 |
Saint John | NB | 0.56 | 0.68 | 0.78 | 0.68 | 0.67 | 0.68 | 0.68 | 0.68 | 0.68 | 0.67 | 0.68 | 0.68 | 0.68 | 0.68 |
St. John's | NL | 0.49 | 0.68 | 0.76 | 0.61 | 0.62 | 0.63 | 0.57 | 0.56 | 0.51 | x | x | 0.51 | 0.51 | 0.51 |
Digby | NS | 0.17 | 1.10 | 1.20 | 1.10 | 1.08 | 1.09 | 1.09 | 1.09 | 1.09 | 0.97 | 1.08 | 1.09 | 1.09 | 1.09 |
Halifax | NS | 0.10 | 0.80 | 0.92 | 0.79 | 0.78 | 0.81 | 0.80 | 0.80 | 0.83 | 0.82 | 0.80 | 0.81 | 0.80 | 0.81 |
Yellowknife | NWT | 0.20 | 0.85 | 1.02 | 0.55 | 0.56 | 0.56 | 0.56 | 0.55 | 0.55 | 0.56 | 0.56 | 0.56 | 0.57 | 0.58 |
Amherstburg | ON | 0.42 | 0.54 | 0.84 | 0.61 | 0.55 | 0.59 | 0.50 | 0.51 | 0.51 | 0.51 | 0.52 | 0.52 | 0.53 | 0.52 |
Thunder Bay | ON | 0.39 | 0.46 | 1.04 | 0.44 | 0.42 | 0.41 | 0.41 | 0.42 | 0.42 | 0.43 | 0.43 | 0.43 | 0.43 | 0.43 |
Kincardine | ON | 0.26 | 0.36 | 0.68 | 0.39 | 0.35 | 0.38 | 0.31 | 0.31 | 0.32 | 0.32 | 0.32 | 0.33 | 0.34 | 0.35 |
Toronto | ON | 0.08 | 0.28 | 0.53 | 0.30 | 0.25 | 0.28 | 0.23 | 0.23 | 0.24 | 0.24 | 0.24 | 0.24 | 0.25 | 0.25 |
Port Hope | ON | 0.02 | 0.57 | 0.98 | 0.61 | 0.55 | 0.55 | 0.55 | 0.54 | 0.54 | 0.54 | 0.54 | 0.54 | 0.55 | 0.57 |
Pickering | ON | 0.47 | 0.53 | 0.82 | 0.57 | 0.49 | 0.51 | 0.49 | 0.49 | 0.49 | 0.49 | 0.49 | 0.49 | 0.50 | 0.50 |
Oshawa | ON | 0.44 | 0.49 | 0.87 | 0.54 | 0.47 | 0.48 | 0.47 | 0.46 | 0.46 | 0.46 | 0.46 | 0.46 | 0.47 | 0.47 |
Markham | ON | 0.14 | 0.54 | 0.84 | 0.59 | 0.51 | 0.54 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | x | x |
Ottawa | ON | 0.16 | 0.40 | 0.57 | 0.41 | 0.37 | 0.37 | 0.38 | 0.37 | 0.38 | 0.37 | 0.37 | 0.32 | 0.38 | 0.38 |
Petawawa | ON | 0.39 | 0.64 | 0.89 | 0.49 | 0.46 | 0.46 | 0.47 | 0.47 | 0.47 | 0.47 | 0.47 | 0.48 | 0.51 | 0.52 |
Charlottetown | PEI | 0.46 | 0.54 | 0.68 | 0.51 | 0.51 | 0.51 | 0.51 | 0.51 | 0.52 | 0.52 | 0.52 | 0.52 | 0.52 | 0.52 |
Montréal | QC | 0.34 | 0.44 | 0.58 | 0.45 | 0.43 | 0.42 | 0.43 | 0.42 | 0.42 | 0.41 | 0.42 | 0.42 | 0.43 | 0.43 |
Trois-Rivières | QC | 0.04 | 0.35 | 0.98 | 0.23 | 0.22 | 0.21 | 0.21 | 0.22 | 0.21 | 0.21 | 0.21 | 0.22 | 0.22 | 0.23 |
Leprad | QC | 0.48 | 0.62 | 0.82 | 0.53 | 0.53 | 0.52 | 0.53 | 0.53 | 0.53 | 0.53 | 0.53 | 0.54 | 0.54 | 0.55 |
Regina | SK | 0.44 | 0.76 | 1.06 | 0.35 | 0.34 | 0.33 | 0.34 | 0.34 | 0.34 | 0.33 | 0.33 | 0.33 | 0.38 | 0.37 |
Station | P/T | Baseline | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | ||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Min | Average | Max | |||||||||||||
x dose data for this date was not collected due to problems with equipment or data transfer Supplementary detectors deployed in March: The MIN, MAX and MEDIAN numbers are only based on the first 35 days of continuous operation of these systems so it is reasonable to expect that future values will be slightly below/above the current MIN/MAX values. |
|||||||||||||||
Prince Rupert | BC | 0.41 | 0.42 | 0.45 | x | 0.43 | 0.43 | 0.44 | 0.43 | 0.43 | 0.43 | 0.43 | 0.42 | ||
Prince George | BC | 0.56 | 0.59 | 0.62 | 0.57 | 0.58 | 0.58 | 0.58 | 0.59 | 0.58 | 0.56 | 0.57 | 0.57 | ||
Kamloops | BC | 0.46 | 0.48 | 0.53 | x | 0.53 | 0.51 | 0.51 | 0.51 | 0.52 | 0.47 | 0.47 | 0.48 | ||
Burnaby | BC | 0.47 | 0.49 | 0.54 | x | 0.48 | 0.50 | 0.48 | 0.50 | 0.48 | 0.50 | 0.54 | 0.48 | ||
Port Hardy | BC | 0.25 | 0.26 | 0.29 | x | 0.26 | 0.27 | 0.29 | 0.27 | 0.26 | 0.27 | 0.28 | 0.26 | ||
Tofino | BC | 0.32 | 0.33 | 0.37 | 0.33 | 0.34 | 0.37 | 0.35 | 0.35 | 0.34 | 0.35 | 0.36 | 0.33 | ||
Abbotsford | BC | 0.28 | 0.29 | 0.31 | 0.29 | 0.29 | 0.30 | 0.29 | 0.29 | 0.28 | 0.29 | 0.31 | 0.28 | ||
Kelowna | BC | 0.84 | 0.87 | 0.93 | 0.87 | 0.88 | 0.92 | 0.89 | 0.93 | 0.89 | 0.87 | 0.87 | 0.84 | ||
Whitehorse | YT | 0.25 | 0.27 | 0.29 | x | 0.26 | 0.27 | 0.29 | 0.27 | 0.26 | 0.27 | 0.28 | 0.26 |
Analysis of the measured data shows that levels of total radiation are within normal background variations. Therefore starting April 1 2011, the daily dose data will be available for select stations across Canada and will only be updated three times a week; however, Health Canada will continue to monitor the data from all stations on a daily basis.
Summary: Data received is as expected and does not pose a health risk to Canadians.
Station | P/T | Baseline (2010) | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Min | Average | Max | |||||||||||||
x dose data for this date was not collected due to problems with equipment or data transfer | |||||||||||||||
Calgary | AB | 0.28 | 0.48 | 0.64 | 0.42 | 0.43 | 0.53 | 0.39 | 0.41 | 0.39 | 0.42 | 0.42 | 0.43 | 0.43 | 0.44 |
Victoria | BC | 0.21 | 0.23 | 0.35 | 0.22 | 0.23 | 0.24 | 0.22 | 0.23 | 0.22 | 0.22 | 0.22 | 0.23 | 0.22 | 0.22 |
Vancouver | BC | 0.07 | 0.44 | 0.59 | 0.42 | 0.43 | 0.44 | 0.43 | 0.43 | 0.43 | 0.44 | 0.44 | 0.43 | 0.43 | 0.43 |
Winnipeg | MB | 0.31 | 0.38 | 1.06 | 0.37 | 0.35 | 0.35 | 0.35 | 0.36 | 0.35 | 0.35 | 0.36 | 0.37 | 0.39 | 0.40 |
Saint John | NB | 0.56 | 0.68 | 0.78 | 0.69 | 0.68 | 0.70 | 0.67 | 0.67 | 0.69 | 0.69 | 0.68 | 0.70 | 0.68 | 0.68 |
St. John's | NL | 0.49 | 0.68 | 0.76 | 0.68 | 0.65 | 0.65 | 0.66 | 0.65 | 0.66 | 0.66 | 0.67 | 0.66 | 0.65 | 0.64 |
Halifax | NS | 0.10 | 0.80 | 0.92 | 0.81 | 0.80 | 0.81 | 0.80 | 0.82 | 0.83 | 0.81 | 0.87 | 0.84 | 0.84 | 0.82 |
Yellowknife | NWT | 0.20 | 0.85 | 1.02 | 0.55 | 0.55 | 0.55 | 0.55 | 0.55 | 0.56 | 0.55 | 0.56 | 0.56 | 0.56 | 0.56 |
Thunder Bay | ON | 0.39 | 0.46 | 1.04 | 0.45 | 0.44 | 0.42 | 0.42 | 0.44 | 0.42 | 0.42 | x | 0.43 | 0.43 | 0.43 |
Toronto | ON | 0.08 | 0.28 | 0.53 | 0.25 | 0.26 | 0.26 | 0.24 | 0.31 | 0.28 | 0.25 | 0.25 | 0.32 | 0.24 | 0.25 |
Charlottetown | PEI | 0.46 | 0.54 | 0.68 | 0.57 | 0.53 | 0.53 | 0.52 | 0.53 | 0.53 | 0.54 | 0.54 | 0.54 | 0.52 | 0.53 |
Montréal | QC | 0.34 | 0.44 | 0.58 | 0.44 | 0.45 | 0.44 | 0.42 | 0.44 | 0.49 | 0.43 | 0.43 | 0.53 | 0.44 | 0.43 |
Regina | SK | 0.44 | 0.76 | 1.06 | 0.38 | 0.39 | 0.41 | 0.43 | 0.46 | 0.44 | 0.45 | 0.47 | 0.50 | 0.54 | 0.55 |
Station | P/T | Baseline | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Min | Average | Max | |||||||||||||
Supplementary detectors deployed in March: The MIN, MAX and MEDIAN numbers are only based on the first 35 days of continuous operation of these systems so it is reasonable to expect that future values will be slightly below/above the current MIN/MAX values. | |||||||||||||||
Prince Rupert | BC | 0.41 | 0.42 | 0.45 | 0.42 | 0.42 | 0.42 | 0.44 | 0.43 | 0.42 | 0.42 | 0.42 | 0.43 | 0.42 | 0.42 |
Prince George | BC | 0.56 | 0.59 | 0.62 | 0.56 | 0.59 | 0.59 | 0.58 | 0.59 | 0.58 | 0.58 | 0.59 | 0.59 | 0.59 | 0.59 |
Kamloops | BC | 0.46 | 0.48 | 0.53 | 0.48 | 0.48 | 0.48 | 0.47 | 0.47 | 0.48 | 0.48 | 0.48 | 0.49 | 0.47 | 0.47 |
Burnaby | BC | 0.47 | 0.49 | 0.54 | 0.48 | 0.48 | 0.48 | 0.54 | 0.50 | 0.48 | 0.48 | 0.48 | 0.48 | 0.50 | 0.48 |
Port Hardy | BC | 0.25 | 0.26 | 0.29 | 0.25 | 0.26 | 0.26 | 0.26 | 0.28 | 0.28 | 0.25 | 0.25 | 0.26 | 0.27 | 0.27 |
Tofino | BC | 0.32 | 0.33 | 0.37 | 0.32 | 0.32 | 0.33 | 0.34 | 0.34 | 0.34 | 0.33 | 0.33 | 0.33 | 0.34 | 0.33 |
Abbotsford | BC | 0.28 | 0.29 | 0.31 | 0.28 | 0.28 | 0.28 | 0.31 | 0.29 | 0.29 | 0.28 | 0.28 | 0.28 | 0.29 | 0.28 |
Kelowna | BC | 0.84 | 0.87 | 0.93 | 0.84 | 0.88 | 0.85 | 0.85 | 0.86 | 0.86 | 0.85 | 0.88 | 0.87 | 0.85 | 0.85 |
Whitehorse | YT | 0.25 | 0.27 | 0.29 | 0.25 | 0.26 | 0.26 | 0.26 | 0.28 | 0.28 | 0.25 | 0.25 | 0.26 | 0.27 | 0.27 |
Station | P/T | Baseline | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Min | Average | Max | |||||||||||||
Supplementary detectors deployed in March: The MIN, MAX and MEDIAN numbers are only based on the first 35 days of continuous operation of these systems so it is reasonable to expect that future values will be slightly below/above the current MIN/MAX values. | |||||||||||||||
Prince Rupert | BC | 0.41 | 0.42 | 0.45 | 0.43 | 0.42 | 0.42 | 0.41 | 0.42 | 0.42 | 0.43 | 0.45 | 0.41 | 0.42 | 0.41 |
Prince George | BC | 0.56 | 0.59 | 0.62 | 0.58 | 0.59 | 0.59 | 0.59 | 0.60 | 0.60 | 0.61 | 0.60 | 0.60 | 0.60 | 0.59 |
Kamloops | BC | 0.46 | 0.48 | 0.53 | 0.47 | 0.48 | 0.47 | 0.46 | 0.48 | 0.48 | 0.49 | 0.49 | 0.47 | 0.49 | 0.48 |
Burnaby | BC | 0.47 | 0.49 | 0.54 | 0.47 | 0.49 | 0.49 | 0.48 | 0.48 | 0.48 | 0.48 | 0.48 | 0.48 | 0.48 | 0.47 |
Port Hardy | BC | 0.25 | 0.26 | 0.29 | 0.26 | 0.26 | 0.26 | 0.26 | 0.25 | 0.25 | 0.26 | 0.27 | 0.26 | 0.25 | 0.25 |
Tofino | BC | 0.32 | 0.33 | 0.37 | 0.35 | 0.34 | 0.34 | 0.32 | 0.32 | 0.32 | 0.33 | 0.33 | 0.33 | 0.32 | 0.33 |
Abbotsford | BC | 0.28 | 0.29 | 0.31 | 0.28 | 0.29 | 0.30 | 0.28 | 0.29 | 0.28 | 0.28 | 0.29 | 0.28 | 0.28 | 0.28 |
Kelowna | BC | 0.84 | 0.87 | 0.93 | 0.85 | 0.88 | 0.86 | 0.86 | 0.86 | 0.86 | 0.88 | 0.86 | 0.86 | 0.87 | 0.85 |
Whitehorse | YT | 0.25 | 0.27 | 0.29 | 0.26 | 0.26 | 0.26 | 0.26 | 0.25 | 0.25 | 0.26 | 0.27 | 0.26 | 0.25 | 0.25 |
Station | P/T | Baseline | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Min | Average | Max | |||||||||||||
Supplementary detectors deployed in March: The MIN, MAX and MEDIAN numbers are only based on the first 35 days of continuous operation of these systems so it is reasonable to expect that future values will be slightly below/above the current MIN/MAX values. | |||||||||||||||
Prince Rupert | BC | 0.41 | 0.42 | 0.45 | 0.41 | 0.42 | 0.43 | 0.41 | 0.41 | 0.41 | 0.41 | 0.41 | |||
Prince George | BC | 0.56 | 0.59 | 0.62 | 0.61 | 0.62 | 0.60 | 0.60 | 0.59 | 0.60 | 0.59 | 0.59 | |||
Kamloops | BC | 0.46 | 0.48 | 0.53 | 0.49 | 0.50 | 0.48 | 0.48 | 0.47 | 0.47 | 0.47 | 0.47 | |||
Burnaby | BC | 0.47 | 0.49 | 0.54 | 0.48 | 0.49 | 0.49 | 0.48 | 0.48 | 0.48 | 0.48 | 0.47 | |||
Port Hardy | BC | 0.25 | 0.26 | 0.29 | 0.25 | 0.27 | 0.27 | 0.25 | 0.26 | 0.25 | 0.25 | 0.25 | |||
Tofino | BC | 0.32 | 0.33 | 0.37 | 0.33 | 0.35 | 0.33 | 0.32 | 0.33 | 0.33 | 0.32 | 0.32 | |||
Abbotsford | BC | 0.28 | 0.29 | 0.31 | 0.28 | 0.29 | 0.30 | 0.28 | 0.28 | 0.29 | 0.28 | 0.28 | |||
Kelowna | BC | 0.84 | 0.87 | 0.93 | 0.87 | 0.88 | 0.87 | 0.86 | 0.86 | 0.85 | 0.86 | 0.85 | |||
Whitehorse | YT | 0.25 | 0.27 | 0.29 | 0.25 | 0.27 | 0.27 | 0.25 | 0.26 | 0.25 | 0.25 | 0.25 |
Given that there have not been any recent significant releases of radiation from Japan and the levels of radiation across Canada continue to be within normal background levels, Health Canada has changed the frequency of publishing the data from all monitoring networks on the website to a single day once a week starting the first week in May.
Summary: Data received is as expected and does not pose a health risk to Canadians.
Summary: Data received is as expected and does not pose a health risk to Canadians.
Station | P/T | Baseline (2010) | June 1 |
June 8 |
June 15 |
June 22 |
June 29 |
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Min | Average | Max | |||||||||||||
x dose data for this date was not collected due to problems with equipment or data transfer | |||||||||||||||
Calgary | AB | 0.28 | 0.48 | 0.64 | 0.45 | 0.46 | 0.47 | 0.45 | 0.47 | ||||||
Abbotsford | BC | 0.28 | 0.29 | 0.31 | 0.30 | 0.28 | 0.28 | 0.29 | 0.30 | ||||||
Burnaby | BC | 0.47 | 0.49 | 0.54 | 0.50 | 0.48 | 0.48 | 0.48 | 0.48 | ||||||
Kamloops | BC | 0.46 | 0.48 | 0.53 | 0.50 | 0.49 | 0.47 | 0.48 | 0.48 | ||||||
Kelowna | BC | 0.84 | 0.87 | 0.93 | 0.89 | 0.90 | 0.86 | 0.89 | 0.89 | ||||||
Port Hardy | BC | 0.25 | 0.26 | 0.29 | 0.26 | 0.26 | 0.25 | 0.25 | 0.29 | ||||||
Prince George | BC | 0.56 | 0.59 | 0.62 | 0.61 | 0.60 | 0.59 | 0.62 | 0.61 | ||||||
Prince Rupert | BC | 0.41 | 0.42 | 0.45 | 0.42 | 0.41 | 0.41 | 0.41 | 0.42 | ||||||
Tofino | BC | 0.32 | 0.33 | 0.37 | 0.34 | 0.33 | 0.33 | 0.33 | 0.33 | ||||||
Victoria | BC | 0.21 | 0.23 | 0.35 | 0.23 | 0.23 | 0.22 | 0.23 | 0.23 | ||||||
Vancouver | BC | 0.07 | 0.44 | 0.59 | 0.44 | 0.44 | 0.42 | 0.42 | 0.43 | ||||||
Winnipeg | MB | 0.31 | 0.38 | 1.06 | 0.35 | 0.40 | 0.42 | 0.43 | 0.38 | ||||||
Saint John | NB | 0.56 | 0.68 | 0.78 | 0.68 | 0.67 | 0.68 | 0.67 | 0.69 | ||||||
St. John's | NL | 0.49 | 0.68 | 0.76 | 0.62 | 0.64 | 0.65 | 0.66 | 0.65 | ||||||
Halifax | NS | 0.10 | 0.80 | 0.92 | 0.82 | 0.82 | 0.86 | 0.80 | 0.77 | ||||||
Yellowknife | NWT | 0.20 | 0.85 | 1.02 | 0.90 | 0.90 | 0.89 | 0.91 | 0.94 | ||||||
Thunder Bay | ON | 0.39 | 0.46 | 1.04 | 0.44 | 0.45 | 0.44 | 0.59 | 0.46 | ||||||
Toronto | ON | 0.08 | 0.28 | 0.53 | x | 0.44 | 0.39 | 0.44 | 0.40 | ||||||
Charlottetown | PEI | 0.46 | 0.54 | 0.68 | 0.53 | 0.53 | 0.53 | 0.52 | 0.54 | ||||||
Montréal | QC | 0.34 | 0.44 | 0.58 | 0.45 | 0.47 | 0.44 | 0.44 | 0.46 | ||||||
Regina | SK | 0.44 | 0.76 | 1.06 | 0.74 | 0.73 | 0.80 | 0.71 | 0.83 | ||||||
Whitehorse | YT | 0.25 | 0.27 | 0.29 | 0.26 | 0.26 | 0.25 | 0.25 | 0.29 |
Summary: Data received is as expected and does not pose a health risk to Canadians.
Summary: Data received is as expected and does not pose a health risk to Canadians.
Station | P/T | Baseline (2010) | August 3 |
August 10 |
August 17 |
August 24 |
August 31 |
||
---|---|---|---|---|---|---|---|---|---|
Min | Average | Max | |||||||
x: the detector for this location is no longer available | |||||||||
Calgary | AB | 0.28 | 0.48 | 0.64 | 0.48 | 0.51 | 0.461 | 0.49 | 0.56 |
Abbotsford | BC | 0.28 | 0.29 | 0.31 | 0.29 | 0.28 | 0.29 | 0.29 | 0.28 |
Burnaby | BC | 0.47 | 0.49 | 0.54 | 0.48 | 0.48 | 0.49 | 0.48 | 0.49 |
Kamloops | BC | 0.46 | 0.48 | 0.53 | 0.50 | 0.48 | 0.49 | 0.48 | 0.48 |
Kelowna | BC | 0.84 | 0.87 | 0.93 | 0.89 | 0.88 | 0.89 | 0.91 | 0.89 |
Port Hardy | BC | 0.25 | 0.26 | 0.29 | 0.25 | x | x | x | x |
Prince George | BC | 0.56 | 0.59 | 0.62 | 0.61 | 0.66 | x | x | x |
Prince Rupert | BC | 0.41 | 0.42 | 0.45 | 0.42 | 0.41 | x | x | x |
Tofino | BC | 0.32 | 0.33 | 0.37 | 0.33 | x | x | x | x |
Victoria | BC | 0.21 | 0.23 | 0.35 | 0.23 | 0.23 | 0.23 | 0.23 | 0.23 |
Vancouver | BC | 0.07 | 0.44 | 0.59 | 0.43 | 0.43 | 0.43 | 0.46 | 0.45 |
Winnipeg | MB | 0.31 | 0.38 | 1.06 | 0.43 | 0.40 | 0.39 | 0.40 | 0.44 |
Saint John | NB | 0.56 | 0.68 | 0.78 | 0.68 | 0.73 | 0.69 | 0.68 | 0.68 |
St. John's | NL | 0.49 | 0.68 | 0.76 | 0.66 | 0.66 | 0.68 | 0.67 | 0.68 |
Halifax | NS | 0.10 | 0.80 | 0.92 | 0.89 | 0.83 | 0.81 | 0.78 | 0.78 |
Yellowknife | NWT | 0.20 | 0.85 | 1.02 | 0.86 | 0.91 | 0.89 | 0.88 | 0.91 |
Thunder Bay | ON | 0.39 | 0.46 | 1.04 | 0.47 | 0.45 | 0.50 | 0.49 | 0.48 |
Toronto | ON | 0.08 | 0.28 | 0.53 | 0.51 | 0.42 | 0.41 | 0.46 | 0.43 |
Charlottetown | PEI | 0.46 | 0.54 | 0.68 | 0.54 | 0.53 | 0.55 | 0.54 | 0.54 |
Montréal | QC | 0.34 | 0.44 | 0.58 | 0.45 | 0.55 | 0.44 | 0.45 | 0.44 |
Regina | SK | 0.44 | 0.76 | 1.06 | 0.93 | 0.89 | 0.89 | 0.88 | 1.03 |
Whitehorse | YT | 0.25 | 0.27 | 0.29 | 0.25 | x | x | x | x |
Summary: Data received is as expected and does not pose a health risk to Canadians.
Station | P/T | Baseline (2010) | September 7 |
September 14 |
September 21 |
September 28 |
||
---|---|---|---|---|---|---|---|---|
Min | Average | Max | ||||||
x dose data for this date was not collected due to problems with equipment or data transfer | ||||||||
Calgary | AB | 0.28 | 0.48 | 0.64 | 0.48 | |||
Abbotsford | BC | 0.28 | 0.29 | 0.31 | 0.29 | |||
Burnaby | BC | 0.47 | 0.49 | 0.54 | 0.49 | |||
Kamloops | BC | 0.46 | 0.48 | 0.53 | 0.51 | |||
Kelowna | BC | 0.84 | 0.87 | 0.93 | 0.92 | |||
Port Hardy | BC | 0.25 | 0.26 | 0.29 | x | |||
Prince George | BC | 0.56 | 0.59 | 0.62 | x | |||
Prince Rupert | BC | 0.41 | 0.42 | 0.45 | x | |||
Tofino | BC | 0.32 | 0.33 | 0.37 | x | |||
Victoria | BC | 0.21 | 0.23 | 0.35 | 0.24 | |||
Vancouver | BC | 0.07 | 0.44 | 0.59 | 0.44 | |||
Winnipeg | MB | 0.31 | 0.38 | 1.06 | 0.47 | |||
Saint John | NB | 0.56 | 0.68 | 0.78 | 0.68 | |||
St. John's | NL | 0.49 | 0.68 | 0.76 | 0.67 | |||
Halifax | NS | 0.10 | 0.80 | 0.92 | 0.80 | |||
Yellowknife | NWT | 0.20 | 0.85 | 1.02 | 0.89 | |||
Thunder Bay | ON | 0.39 | 0.46 | 1.04 | 0.51 | |||
Toronto | ON | 0.08 | 0.28 | 0.53 | 0.41 | |||
Charlottetown | PEI | 0.46 | 0.54 | 0.68 | 0.53 | |||
Montréal | QC | 0.34 | 0.44 | 0.58 | 0.44 | |||
Regina | SK | 0.44 | 0.76 | 1.06 | 0.90 | |||
Whitehorse | YT | 0.25 | 0.27 | 0.29 | x |
Health Canada's CTBT monitoring stations are highly sensitive and capable of detecting a broad range of isotopes at low concentrations. The measurements in the following charts show the concentrations of the principal isotopes of interest coming from the damaged reactors that were detected in the first few weeks of the emergency.
Five stations across Canada are equipped to detect and measure isotopes in particulate form. Data for cesium-137, iodine-131, and tellurium-132 are reported in milliBecquerels per cubic meter (mBq/m³).
In addition, Yellowknife, Ottawa, and St John's are equipped to collect data for xenon-133, which is a noble gas. Noble gases do not react with other elements in the environment. As a result, they can travel long distances in the atmosphere which makes them good tracers to follow the movements of atmospheric contamination. Xenon-133 measurements are reported in Becquerels per cubic meter (Bq/m³). The contribution of Xenon-133 to total radiation dose is minimal and does not pose any health risk.
Note: There is a lag time for posting data from this network of stations as the radioactivity is measured over a longer period of time and then must be analyzed.
Summary: Data received indicates no health risks to Canadians
Station | P/T | Radioisotope | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sidney | BC | Xe-133 (Bq/m³) |
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Te-132 (mBq/m³) |
- | 0.22 | 0.35 | 0.69 | 0.38 | 0.15 | 0.20 | 0.24 | 0.35 | 0.07 | 0.04 | 0.01 | 0.01 | 0.01 | - | ||
I-131 (mBq/m³) |
- | 0.55 | 1.91 | 3.63 | 2.75 | 1.29 | 1.14 | 1.64 | 2.74 | 0.51 | 0.63 | 0.39 | 0.26 | 0.28 | - | ||
Cs-137 (mBq/m³) |
- | 0.03 | 0.09 | 0.21 | 0.15 | 0.09 | 0.11 | 0.15 | 0.40 | 0.11 | 0.06 | 0.01 | 0.01 | 0.02 | - | ||
St. John's | NL | Xe-133 (Bq/m³) |
- | - | - | 0.00 | 0.00 | 0.00 | 0.01 | 0.05 | 0.08 | 0.16 | 0.05 | 0.09 | 0.15 | 0.16 | 1.2 |
Te-132 (mBq/m³) |
- | - | - | - | - | - | - | 0.19 | - | - | - | 0.00 | - | - | 0.01 | ||
I-131 (mBq/m³) |
- | - | 0.00 | - | - | - | 0.08 | 0.15 | - | 0.38 | 0.50 | 0.27 | 0.14 | 0.11 | 0.57 | ||
Cs-137 (mBq/m³) |
- | - | - | - | - | - | 0.00 | 0.00 | - | - | 0.00 | 0.00 | 0.00 | - | 0.05 | ||
Yellowknife | NWT | Xe-133 (Bq/m³) |
- | - | 0.00 | 0.00 | 0.00 | 0.00 | 0.31 | 0.69 | 2.18 | 0.65 | 1.26 | 1.34 | 1.21 | 1.06 | 1.85 |
Te-132 (mBq/m³) |
- | - | - | - | - | - | 0.02 | 0.01 | 0.09 | 0.01 | 0.03 | 0.01 | 0.02 | 0.02 | 0.04 | ||
I-131 (mBq/m³) |
- | - | - | - | 0.00 | - | 0.32 | 0.63 | 2.29 | 0.74 | 1.33 | 0.79 | 1.02 | 0.99 | 1.21 | ||
Cs-137 (mBq/m³) |
- | - | - | - | - | - | 0.02 | 0.02 | 0.12 | - | 0.06 | 0.04 | 0.06 | 0.07 | 0.17 | ||
Resolute Bay | NU | Xe-133 (Bq/m³) |
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Te-132 (mBq/m³) |
- | - | - | - | - | - | - | 0.00 | 0.00 | 0.08 | 0.01 | - | - | - | 0.01 | ||
I-131 (mBq/m³) |
- | - | - | - | 1.16 | 2.77 | 1.08 | 0.40 | 1.60 | 1.13 | 3.12 | 6.93 | 9.76 | 4.51 | 3.66 | ||
Cs-137 (mBq/m³) |
- | - | - | - | - | - | - | 0.00 | 0.01 | 0.08 | 0.05 | - | - | 0.05 | 0.06 | ||
Ottawa | ON | Xe-133 (Bq/m³) |
0.01 | 0.00 | 0.16 | 0.04 | - | 0.10 | - | 0.01 | 0.05 | 0.11 | 0.06 | 0.29 | 1.87 | 1.94 | 3.64 |
Te-132 (mBq/m³) |
- | - | - | - | 0.01 | 0.05 | 0.01 | 0.00 | - | - | 0.00 | - | - | 0.02 | 0.02 | ||
I-131 (mBq/m³) |
- | - | 0.01 | - | 0.25 | 4.26 | 1.43 | 1.19 | 0.78 | 0.47 | 0.72 | 0.39 | 1.18 | 0.80 | 0.80 | ||
Cs-137 (mBq/m³) |
- | - | - | - | - | 0.04 | 0.01 | 0.00 | 0.00 | - | 0.00 | 0.00 | 0.07 | 0.10 | 0.10 |
Please note that starting April 1, 2011 the following charts will only be updated 3 times a week; however, Health Canada will continue to monitor the data on a daily basis.
Summary: Data received indicates no health risks to Canadians
Station | P/T | Radioisotope | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
blank: data not available at the time of publishing - : not detected < 0.01: less than 0.01 | |||||||||||||||||
Sidney | BC | Xe-133 (Bq/m³) |
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Te-132 (mBq/m³) |
< 0.01 |
< 0.01 |
0.01 | 0.01 | < 0.01 | < 0.01 | < 0.01 | < 0.01 | - | < 0.01 | - | - | - | - | - | ||
I-131 (mBq/m³) |
0.09 | 0.12 | 0.44 | 0.50 | 0.08 | 0.13 | 0.20 | 0.10 | - | 0.08 | 0.03 | 0.06 | 0.05 | 0.08 | 0.07 | ||
Cs-137 (mBq/m³) |
< 0.01 | 0.01 | 0.06 | 0.11 | 0.21 | 0.04 | 0.09 | 0.05 | - | 0.04 | 0.02 | 0.02 | 0.02 | 0.02 | 0.03 | ||
St. John's | NL | Xe-133 (Bq/m³) |
1.86 | 1.35 | 1.51 | 3.51 | 2.29 | 1.73 | 1.17 | - | - | - | 0.76 | 0.62 | 0.47 | 0.45 | 0.30 |
Te-132 (mBq/m³) |
0.01 | < 0.01 | < 0.01 | 0.03 | 0.07 | 0.01 | 0.01 | 0.02 | 0.01 | 0.01 | 0.01 | < 0.01 | - | < 0.01 | - | ||
I-131 (mBq/m³) |
0.42 | 0.14 | 0.20 | 0.94 | 2.17 | 0.39 | 0.44 | 0.50 | 0.71 | 0.81 | 0.40 | 0.22 | 0.14 | 0.30 | 0.02 | ||
Cs-137 (mBq/m³) |
0.04 | 0.02 | 0.04 | 0.26 | 0.92 | 0.11 | 0.22 | 0.35 | 0.29 | 0.30 | 0.29 | 0.18 | 0.05 | 0.12 | 0.01 | ||
Yellowknife | NWT | Xe-133 (Bq/m³) |
2.05 | 2.38 | 1.42 | 1.30 | 1.30 | 1.32 | 1.15 | - | - | - | - | - | - | - | - |
Te-132 (mBq/m³) |
0.04 | 0.04 | 0.01 | 0.02 | 0.01 | 0.01 | 0.01 | 0.01 | < 0.01 | < 0.01 | < 0.01 | < 0.01 | 0.01 | - | 0.01 | ||
I-131 (mBq/m³) |
1.34 | 1.72 | 2.15 | 2.37 | 1.96 | 1.07 | 1.28 | 0.74 | 0.34 | 0.72 | 1.00 | 1.17 | 1.07 | 0.70 | 1.00 | ||
Cs-137 (mBq/m³) |
0.22 | 0.30 | 0.11 | 0.14 | 0.16 | 0.13 | 0.13 | 0.13 | 0.08 | 0.12 | 0.15 | 0.16 | 0.36 | 0.20 | 0.46 | ||
Resolute Bay | NU | Xe-133 (Bq/m³) |
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Te-132 (mBq/m³) |
0.18 | 0.02 | 0.02 | 0.02 | 0.01 | < 0.01 | < 0.01 | - | < 0.01 | - | - | - | - | - | - | ||
I-131 (mBq/m³) |
5.03 | 3.86 | 7.35 | 3.14 | 2.36 | 1.31 | 1.32 | 1.36 | 1.93 | 1.37 | 2.14 | 1.93 | 1.23 | 0.67 | 0.87 | ||
Cs-137 (mBq/m³) |
0.81 | 0.10 | 0.16 | 0.18 | 0.10 | 0.07 | 0.10 | 0.06 | 0.10 | 0.12 | 0.16 | 0.13 | 0.09 | 0.08 | 0.15 | ||
Ottawa | ON | Xe-133 (Bq/m³) |
2.99 | 2.37 | 2.52 | - | - | - | - | - | - | 0.96 | 0.57 | 0.39 | 0.43 | 0.39 | 0.35 |
Te-132 (mBq/m³) |
0.06 | 0.04 | 0.04 | 0.02 | 0.01 | 0.01 | 0.01 | 0.01 | - | - | < 0.01 | - | < 0.01 | - | |||
I-131 (mBq/m³) |
2.61 | 1.66 | 3.10 | 2.14 | 0.48 | 0.48 | 1.11 | 1.05 | - | - | 0.37 | 0.05 | 0.38 | 0.13 | - | ||
Cs-137 (mBq/m³) |
0.25 | 0.26 | 0.27 | 0.21 | 0.07 | 0.11 | 0.24 | 0.24 | - | - | 0.10 | 0.01 | 0.12 | 0.06 | - |
Station | P/T | Radioisotope | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
blank: data not available at the time of publishing - : not detected < 0.01: less than 0.01 | |||||||||||||||||
Sidney | BC | Xe-133 (Bq/m³) |
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Te-132 (mBq/m³) |
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
I-131 (mBq/m³) |
0.07 |
0.07 | 0.04 | 0.04 | 0.04 | 0.03 | 0.03 | 0.07 | 0.06 | 0.03 | 0.01 | < 0.01 | 0.01 | 0.01 | 0.01 | ||
Cs-137 (mBq/m³) |
0.05 | 0.04 | 0.02 | 0.02 | 0.04 | 0.02 | 0.02 | 0.06 | 0.04 | 0.02 | < 0.01 | < 0.01 | < 0.01 | < 0.01 | < 0.01 | ||
St. John's | NL | Xe-133 (Bq/m³) |
0.28 | 0.31 | 0.26 | 0.18 | 0.17 | 0.16 |
0.14 | 0.13 | 0.10 | 0.09 | 0.07 | 0.07 | 0.06 | 0.05 | 0.03 |
Te-132 (mBq/m³) |
< 0.01 | - | - | - | - | - | - | - | - | - | - | - | - | - | |||
I-131 (mBq/m³) |
0.56 | 0.46 | 0.17 | 0.02 | 0.06 | 0.05 | 0.02 | 0.14 | 0.08 | < 0.01 | 0.02 | 0.02 | 0.01 | 0.01 | - | ||
Cs-137 (mBq/m³) |
0.30 | 0.36 | 0.22 | 0.01 | 0.09 | 0.05 | 0.03 | 0.13 | 0.10 | 0.06 | 0.02 | 0.02 | 0.02 | - | - | ||
Yellowknife | NWT | Xe-133 (Bq/m³) |
- | - | 0.24 | 0.21 | 0.15 | 0.13 | 0.12 | 0.12 | 0.12 | - | - | 0.07 | 0.06 | 0.05 | 0.05 |
Te-132 (mBq/m³) |
< 0.01 | < 0.01 | < 0.01 | - | - | - | - | - | - | - | - | - | - | - | - | ||
I-131 (mBq/m³) |
0.93 | 0.60 | 0.60 | 0.23 | 0.15 | 0.44 | 0.47 | 0.23 | 0.26 | 0.39 | 0.13 | 0.09 | 0.05 | 0.04 | 0.05 | ||
Cs-137 (mBq/m³) |
0.36 | 0.30 | 0.30 | 0.20 | 0.09 | 0.13 | 0.19 | 0.15 | 0.17 | 0.23 | 0.16 | 0.09 | 0.07 | 0.03 | 0.04 | ||
Resolute Bay | NU | Xe-133 (Bq/m³) |
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Te-132 (mBq/m³) |
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
I-131 (mBq/m³) |
0.87 | 1.01 | 0.79 | 0.88 | 0.67 | 0.54 | 0.36 | 0.29 | 0.46 | 0.37 | - | 0.30 | 0.14 | 0.18 | 0.10 | ||
Cs-137 (mBq/m³) |
0.24 | 0.23 | 0.16 | 0.29 | 0.31 | 0.30 | 0.19 | 0.13 | 0.26 | 0.28 | - | 0.20 | 0.11 | 0.21 | 0.15 | ||
Ottawa | ON | Xe-133 (Bq/m³) |
0.33 | - | - | - | - | 1.10 | - | 0.14 | 0.12 | 0.13 | - | - | - | - | - |
Te-132 (mBq/m³) |
- | - | < 0.01 | - | - | - | - | - | - | - | - | - | - | - | - | ||
I-131 (mBq/m³) |
- | - | 0.20 | 0.10 | 0.11 | 0.03 | 0.04 | - | - | - | - | 0.01 | < 0.01 | < 0.01 | - | ||
Cs-137 (mBq/m³) |
- | - | 0.16 | 0.14 | 0.09 | 0.03 | 0.05 | - | - | - | - | 0.02 | 0.01 | < 0.01 | - |
Given that there have not been any recent significant releases of radiation from Japan and the levels of radiation across Canada continue to be within normal background levels, Health Canada has changed the frequency of publishing the data from all monitoring networks on the Website to a single day once a week starting the first week in May.
Summary: Data received indicates no health risks to Canadians
Station | P/T | Radioisotope | 4 | 11 | 18 | 25 | |
---|---|---|---|---|---|---|---|
blank: data not available at the time of publishing - : not detected < 0.01: less than 0.01 | |||||||
Sidney | BC | Xe-133 (Bq/m³) |
- | - | - | - | |
Te-132 (mBq/m³) |
- | - | - | - | |||
I-131 (mBq/m³) |
0.01 | - | < 0.01 | - | |||
Cs-137 (mBq/m³) |
0.01 | - | < 0.01 | < 0.01 | |||
St. John's | NL | Xe-133 (Bq/m³) |
0.03 | 0.01 | 0.01 | - | |
Te-132 (mBq/m³) |
- | - | - | - | |||
I-131 (mBq/m³) |
0.01 | - | - | < 0.01 | |||
Cs-137 (mBq/m³) |
0.01 | - | - | < 0.01 | |||
Yellowknife | NWT | Xe-133 (Bq/m³) |
0.03 | 0.01 | 0.01 | - | |
Te-132 (mBq/m³) |
- | - | - | - | |||
I-131 (mBq/m³) |
0.03 | < 0.01 | < 0.01 | < 0.01 | |||
Cs-137 (mBq/m³) |
0.04 | 0.01 | < 0.01 | < 0.01 | |||
Resolute Bay | NU | Xe-133 (Bq/m³) |
- | - | - | - | |
Te-132 (mBq/m³) |
- | - | - | - | |||
I-131 (mBq/m³) |
0.12 | - | 0.02 | 0.01 | |||
Cs-137 (mBq/m³) |
0.09 | - | 0.02 | < 0.01 | |||
Ottawa | ON | Xe-133 (Bq/m³) |
- | - | - | - | |
Te-132 (mBq/m³) |
- | - | - | - | |||
I-131 (mBq/m³) |
< 0.01 | < 0.01 | < 0.01 | - | |||
Cs-137 (mBq/m³) |
0.01 | - | - | - |
Data for Xe-133 from Japan is below reporting levels and no longer appears in the table.
Summary: Data received indicates no health risks to Canadians
Station | P/T | Radioisotope | 1 | 8 | 15 | 22 | 29 |
---|---|---|---|---|---|---|---|
blank: data not available at the time of publishing - : not detected < 0.01: less than 0.01 | |||||||
Sidney | BC | Te-132 (mBq/m³) |
- | - | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | - | ||
Cs-137 (mBq/m³) |
- | < 0.01 | - | - | - | ||
St. John's | NL | Te-132 (mBq/m³) |
- | - | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | - | ||
Cs-137 (mBq/m³) |
< 0.01 | - | - | - | - | ||
Yellowknife | NWT | Te-132 (mBq/m³) |
- | - | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | - | ||
Cs-137 (mBq/m³) |
< 0.01 | - | - | - | - | ||
Resolute Bay | NU | Te-132 (mBq/m³) |
- | - | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | - | ||
Cs-137 (mBq/m³) |
- | < 0.01 | - | - | - | ||
Ottawa | ON | Te-132 (mBq/m³) |
- | - | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | - | ||
Cs-137 (mBq/m³) |
< 0.01 | - | - | - | - |
Summary: Data received indicates no health risks to Canadians
Station | P/T | Radioisotope | 6 | 13 | 20 | 27 |
---|---|---|---|---|---|---|
blank: data not available at the time of publishing - : not detected < 0.01: less than 0.01 | ||||||
Sidney | BC | Te-132 (mBq/m³) |
- | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | ||
Cs-137 (mBq/m³) |
- | - | - | - | ||
St. John's | NL | Te-132 (mBq/m³) |
- | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | ||
Cs-137 (mBq/m³) |
- | - | - | - | ||
Yellowknife | NWT | Te-132 (mBq/m³) |
- | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | ||
Cs-137 (mBq/m³) |
- | - | - | - | ||
Resolute Bay | NU | Te-132 (mBq/m³) |
- | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | ||
Cs-137 (mBq/m³) |
- | - | - | - | ||
Ottawa | ON | Te-132 (mBq/m³) |
- | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | ||
Cs-137 (mBq/m³) |
- | - | - | - |
Summary: Data received indicates no health risks to Canadians
Station | P/T | Radioisotope | 3 | 10 | 17 | 24 | 31 |
---|---|---|---|---|---|---|---|
blank: data not available at the time of publishing - : not measured or not detected x: data for this date was not collected due to problems with equipment < 0.01: less than 0.01 |
|||||||
Sidney | BC | Te-132 (mBq/m³) |
x | x | - | - | < 0.01 |
I-131 (mBq/m³) |
x | x | - | - | - | ||
Cs-137 (mBq/m³) |
x | x | - | - | - | ||
St. John's | NL | Te-132 (mBq/m³) |
- | - | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | - | ||
Cs-137 (mBq/m³) |
- | - | - | - | - | ||
Yellowknife | NWT | Te-132 (mBq/m³) |
- | - | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | < 0.01 | ||
Cs-137 (mBq/m³) |
- | < 0.01 | - | - | - | ||
Resolute Bay | NU | Te-132 (mBq/m³) |
- | - | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | - | ||
Cs-137 (mBq/m³) |
- | < 0.01 | - | - | - | ||
Ottawa | ON | Te-132 (mBq/m³) |
- | - | - | - | - |
I-131 (mBq/m³) |
- | - | - | - | - | ||
Cs-137 (mBq/m³) |
- | < 0.01 | - | - | - |
Summary: Data received indicates no health risks to Canadians
Station | P/T | Radioisotope | 7 | 14 | 21 | 28 |
---|---|---|---|---|---|---|
x: air concentration data for this date was not collected due to problems with equipment blank: data not available at the time of publishing - : not detected < 0.01: less than 0.01 |
||||||
Sidney | BC | Te-132 (mBq/m³) |
- | |||
I-131 (mBq/m³) |
- | |||||
Cs-137 (mBq/m³) |
- | |||||
St. John's | NL | Te-132 (mBq/m³) |
- | |||
I-131 (mBq/m³) |
- | |||||
Cs-137 (mBq/m³) |
- | |||||
Yellowknife | NWT | Te-132 (mBq/m³) |
- | |||
I-131 (mBq/m³) |
- | |||||
Cs-137 (mBq/m³) |
- | |||||
Resolute Bay | NU | Te-132 (mBq/m³) |
- | |||
I-131 (mBq/m³) |
- | |||||
Cs-137 (mBq/m³) |
- | |||||
Ottawa | ON | Te-132 (mBq/m³) |
- | |||
I-131 (mBq/m³) |
- | |||||
Cs-137 (mBq/m³) |
- |