Gamma Spectrum Generator for large nuclide inventories?

October 15th, 2019
by Joseph Magill

(Qu.) AM, Linköping University, Sweden
Dear Nucleonica Team,
We work with a mixture of about 900 radionuclides. We would like to generate corresponding gamma spectra using the Gamma Spectrum Generator++, but the generator allows to work with no more than 20 nuclides in the mixture. Is there a way how to increase this number? Would a standalone application help? It would be a bit laborious to split the 900 nuclides to 45 groups, process each group individually and then combine the results.

(Ans. Nucleonica Team)
Depending on your requirements, it may not be necessary to use the Gamma Spectrum Generator, GSG (which is as you say restricted to 20 nuclides). A spectrum can be obtained using the Gamma Dosimetry & Shielding, D&S H*(10) application. This line spectrum is obtained using the activities, emission probabilities and the energies of the emitted radiation. This may be sufficient for your purposes. It does not include peak broadening, Compton scattering and background scattering as in the GSG. The advantage of using the D&S H*(10) is that it is can handle 900 nuclides with a reasonable calculation time (typically a few seconds).
If you require the full GSG spectrum with line broadening, Compton scattering etc. You will need to use one of our test servers for this purpose. There a GSG spectrum for approx. 900 nuclides (with around 28000 gamma lines) will require a calculation time of approx. 20 mins. The Nucleonica Team can provide more information on our test servers.

Once you have the GSG spectrum for the 900 nuclides, you can save this in XML format. This xml file can then be uploaded into the webGraph application. Using the xml files in webGraph provides therefore an “Active” graph which can be used for later viewing and examination. With the Active graph the user can zoom in and out and use the mouse cursor to identify the underlying nuclides.

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