| Autor: |
A. M. Rawool, Trilok C. Kaushik, Sanjay Andola |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 944:162580 |
| ISSN: |
0168-9002 |
| DOI: |
10.1016/j.nima.2019.162580 |
| Popis: |
In this study, numerical simulations have been carried out to evaluate the effect of moderator parameters (material/dimensions) for standard radio-isotopic/fission (Pu-Be and 252Cf) and fusion sources (D-D). These sources are used for calibrating thermal neutron detectors, which are often employed for determining absolute neutron yield in fusion-based sources. Simulations have been carried out using the Monte Carlo based “FLUKA” code for typical moderator materials and 3He/BF3 proportional counter based thermal neutron detectors. Results have been validated against experimentally measured values for an available radio-isotopic source. A notable difference in the detector efficiency was observed due to the source energy term. The detection efficiency ratio for Pu-Be:D-D:252Cf sources with the same moderator thickness (optimized for 252Cf) was found to be 1 : 1.16±0.02 : 1.40±0.03. For these three types of sources, optimum acrylic (Perspex) and polypropylene moderator thicknesses have been observed to be 100,100,80 mm and 80,80,60 mm respectively with the corresponding efficiency ratio of 1 : 1.15±0.02 : 1.34±0.008. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect