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Radiation Geophysics Gamma calculator
This JavaScript calculator demonstrates the process of calculating
equivalent ground concentrations of potassium (K), uranium (U) and
thorium (Th) from measured raw count rates and spectrometer/system
constants.
This calculator is for educational/demonstration purposes only.
A complete description of the techniques for
processing gamma-ray spectrometry data can be found in:
Airborne Gamma-Ray Spectrometer Surveying,
IAEA
Technical Reports Series No. 323,
International Atomic Energy Agency, 1991.
- The top two sections (Spectrometer/system constants &
Measured field data) are already pre-filled with sample values.
Note that these values are specific to a particular system
(consisting of a spectrometer, set of NaI detectors and an aircraft)
and can not be used on other systems. Proper calibration is required.
- You can modify any of the values in the top two sections if you
wish to experiment with different values.
- Press the Calculate button in the third section to
calculate the equivalent ground concentrations.
- The Spectrometer/system constants can be reset to the
original values with the Restore constants button.
The Measured field data can be reset to the original
values with the Restore data button.
- HTML/JavaScript limitations:
- Read-only/display-only fields are not available. Although the
values in the Calculate concentrations section can be edited,
the changes are ignored and are always over-written with calculated values
when the Calculate button is clicked.
- Functions to format floating-point numbers are limited:
I have made an arbitrary decision to display results with 2 decimal places.
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