Abstract
A new approach has been developed, validated and demonstrated for generating detector response functions for γ-rays incident on NaI detectors. The approach is demonstrated for γ-rays with energies from 0.5 to 10.5 MeV incident on 3″ × 3″ and 6″ × 6″ cylindrical detectors. The γ-ray source used here is a point isotropic source located 10 cm from the detector face on the detector axis. However, the approach is very general and could be used for any other geometry desired and any detector type, with appropriate Monte Carlo simulation. A specific purpose Monte Carlo simulation code called DRFNCS has been designed for this purpose and was benchmarked against the general purpose ITS electron/photon codes developed by Sandia National Laboratories. The DRFNCS code is orders of magnitude faster than the ITS general purpose code and allows one to practically simulate the large number of spectra that are required for this purpose. Then the method of principal components is applied to the Monte Carlo data. This reduces the amount of data required and allows detector response functions to be generated efficiently and accurately for any γ-ray energy within the specified energy range.
| Original language | English |
|---|---|
| Pages (from-to) | 243-259 |
| Number of pages | 17 |
| Journal | Nuclear Geophysics |
| Volume | 8 |
| Issue number | 3 |
| State | Published - Jun 1994 |
| Externally published | Yes |