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1. Radionuclides of Interest
Select primary (parent) radionuclides of interest by clicking on a radionuclide in the
"Radionuclides (and daughter progeny)" list to highlight it and then clicking
on the ">>" button to add it to the "Radionuclides of Interest"
list. To calculate the parent and daughter activities manually,
deselect the box "Include daughter products." When one or all radionuclides have been selected, click "Next".
2. Activity Concentrations
Enter the target activity concentration (TAC) in pCi/cm2 for each radionuclide in the table.
TACs are like PRGs. If multiple radionuclides are selected, enter the Field Activity Concentrations (FACs).
FACs are simply used to generate the isotopic ratio. Click "Next".
3. Detector & Site Information
Select the size of the gamma scintillation detector. Enter the estimated distance between the source and the detector in
centimeters. Click "Next".
4. Results
The results are displayed. In the "Number of Photons" column, click on the hyperlinked number for a
list of a radionuclide's photon energies and yields. If a radionuclide in the list emits one or more photons outside the range of
the detector, a list of the photons excluded from the calculation of Gross Detector Response (GDP) will appear below the results table.
The GDP is presented in bold. Click the "Back" button to go back a page or click "Start Over" to begin another calculation.
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