Report · Printed book
Monte Carlo calculations and measurements of spectra from a C-14 source
To perform Monte Carlo simulations it is necessary to model the physical geometries i.e., the source and detector geometry. However, a complete model of the physical geometry may not be possible or may result in a very low calculation efficiency. Substituting the complete source model with a simplified model is one way of increasing the calculation efficiency.
In this report, the study of a simplified model of a "1"4C source is described. Results of Monte Carlo calculations with the EGS4 code are compared with measurements with a #beta# spectrometer consisting of two coaxial Si detectors, and a low-energy photon spectrometer being a Si(Li) detector. Calculations and measurements show generally good agreement.
However, the difference (a factor of 4) between calculated and measured response to electrons for the Si(Li) detector indicates that this detector has a dead layer about 12 #mu#m thick instead of 0.2 #mu#m as reported by the manufacturer. The efficiency of the calculations is increased by a factor of 10, when the complete source model is replaced by the simplified source model.
This reduces the calculation time of detector responses to a few days instead of weeks on the NRC SGI R4400 computers. Good agreement between measured and calculated data also verifies that the MC code EGS4 is a reliable and useful tool for simulating coupled electron and photon transport for particles with energies down to a few keV. (au) 3 tabs., 15 ills., 11 refs..
Language: | English |
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Year: | 1996 |
Pages: | 26 s. |
Series: | Denmark. Forskningscenter Risoe. Risoe-r |
ISBN: | 8755021794 and 9788755021792 |
ISSN: | 01062840 |
Types: | Report and Printed book |