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Natural Resources Canada > Earth Sciences Sector > Geological Survey of Canada > Radiocarbon Dating
Radiocarbon Dating International Collaborative Study (C-14 Crosschecks) The Geological Survey of Canada Radiocarbon Dating Laboratory ceased operation at the end of 2005. This site will be maintained to provide reference information on the samples dated during the 45 years of operation of the GSC laboratory from 1960 to 2005.
For each stage, the GSC age estimates compare very favourably with the expected ages.
In stage 1 and 2 the GSC laboratory tended to provide ages slightly younger than the expected ages, but in stage 3 of the study, in which each laboratory carried out the complete treatment on natural samples, the GSC age estimates were excellent.
| |
|
Age
| |
| Stage 1 |
No treatment |
Expected |
Normalized |
Uncorrected |
del C-13 |
| GSC-4308 |
carbonate |
3600 |
3610 +/- 70 |
3690 +/- 70 |
-30.0 |
| GSC-4308R |
carbonate |
3600 |
3600 +/- 60 |
3680 +/- 60 |
-30.0 |
| GSC-4309 |
carbonate |
3600 |
3530 +/- 60 |
3610 +/- 60 |
-29.7 |
| GSC-4314 |
carbonate |
-66 |
-160 +/- 50 |
-150 +/- 50 |
-25.9 |
| GSC-4312 |
carbonate |
-66 |
-100 +/- 50 |
-90 +/- 50 |
-25.5 |
| |
| Stage 2 |
No treatment |
|
|
|
|
| GSC-4438 |
"marine alga, carbonate" |
2120 |
2020 +/- 60 |
1660 +/- 60 |
-2.8 |
| GSC-4437 |
"marine alga, carbonate" |
2120 |
2050 +/- 60 |
1690 +/- 60 |
-2.6 |
| GSC-4439 |
wood cellulose |
2250 |
2150 +/- 60 |
2130 +/- 60 |
-24.1 |
| GSC-4440 |
wood cellulose |
2250 |
2160 +/- 60 |
2170 +/- 60 |
-25.9 |
| |
| Stage 3 |
Standard treatment |
| 5-L counter |
| GSC-4674 |
wood |
290 +/- 15 |
280 +/- 50 |
290 +/- 50 |
-25.3 |
| GSC-4671 |
peat |
3395 |
3380 +/- 60 |
3460 +/- 60 |
-29.5 |
| GSC-4676 |
wood |
2185 +/- 10 |
2210 +/- 50 |
2230 +/- 50 |
-26.1 |
| GSC-4666 |
marine shells |
670 |
700 +/- 50 |
260 +/- 50 |
+2.0 |
| GSC-4677 |
wood |
2185 +/- 10 |
2140 +/- 60 |
2150 +/- 60 |
-25.6 |
| GSC-4677X |
wood |
2185 +/- 10 |
2180 +/- 80 |
2190 +/- 80 |
-25.6 |
| GSC-4673 |
wood |
100 +/- 15 |
70 +/- 50 |
100 +/- 50 |
-26.6 |
| GSC-4672 |
peat |
3395 |
3340 +/- 50 |
3380 +/- 50 |
-27.0 |
| GSC-4667 |
marine shells |
670 |
650 +/- 50 |
250 +/- 50 |
+0.2 |
| 2-L counter |
| GSC-4308 2 |
carbonate |
3600 |
3620 +/- 60 |
3680 +/- 60 |
-28.9 |
| GSC-4674 2 |
wood |
290 +/- 15 |
340 +/- 60 |
350 +/- 60 |
-25.3 |
| GSC-4671 2 |
peat |
3395 |
3370 +/- 60 |
3440 +/- 60 |
-29.5 |
| GSC-4676 2 |
wood |
2185 +/- 10 |
2210 +/- 60 |
2220 +/- 60 |
-26.1 |
| GSC-4677 2 |
wood |
2185 +/- 10 |
2290 +/- 70 |
2300 +/- 70 |
-25.6 |
| GSC-4673 2 |
wood |
100 +/- 15 |
150 +/- 60 |
180 +/- 60 |
-26.6 |
| GSC-4672 2 |
peat |
3395 |
3470 +/- 60 |
3500 +/- 60 |
-27.0 |
| GSC-4667 2 |
marine shells |
670 |
720 +/- 60 |
320 +/- 60 |
+0.2 |
|
