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Experimentally determined vs. Monte Carlo simulated peak-to-valley ratios for a well-characterised n-type HPGe detector.

Östlund, Karl LU ; Samuelsson, Christer LU and Rääf, Christopher LU (2015) In Applied Radiation and Isotopes 95. p.94-100
Abstract
Measurements and simulations to investigate the contributing factors to the peak-to-valley (PTV) ratio have been both experimentally determined as well as Monte Carlo simulated for a well-characterised HPGe n-type detector together with a Cs-137 gamma source encapsulated in thin polystyrene. Measurements were carried out in a low-background gamma counting facility at Lund University. The results of the PTV ratio have been compared to distinguish what components or variables in the setup that significantly influence the ratio. In addition to manufacture specifications, the detector components have been examined using planar X-ray, source scanning and computer tomography in order to determine and verify component dimensions when necessary.... (More)
Measurements and simulations to investigate the contributing factors to the peak-to-valley (PTV) ratio have been both experimentally determined as well as Monte Carlo simulated for a well-characterised HPGe n-type detector together with a Cs-137 gamma source encapsulated in thin polystyrene. Measurements were carried out in a low-background gamma counting facility at Lund University. The results of the PTV ratio have been compared to distinguish what components or variables in the setup that significantly influence the ratio. In addition to manufacture specifications, the detector components have been examined using planar X-ray, source scanning and computer tomography in order to determine and verify component dimensions when necessary. In spite of these efforts a discrepancy of approximately 25% for thin absorbers in the PTV ratio between measurements and calculations is observed. However, this discrepancy becomes less significant for larger absorbing layers of copper (>1mm). This indicates that it would be difficult to achieve a field calibration for in-situ gamma spectrometry using the PTV ratio that could position a Cs-137 source in soil depth shallower than corresponding 1mm layer of copper. The results also showed that when building a detector in simulations part by part, the inner dead layer, and the contact pin are of great importance for the accuracy of the PTV ratio simulations. (Less)
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organization
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Contribution to journal
publication status
published
subject
in
Applied Radiation and Isotopes
volume
95
pages
94 - 100
publisher
Elsevier
external identifiers
  • pmid:25464184
  • wos:000347585200016
  • scopus:84909957556
ISSN
0969-8043
DOI
10.1016/j.apradiso.2014.09.022
language
English
LU publication?
yes
id
432095a6-1e38-43b2-8689-cc9998c5dd00 (old id 4912883)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/25464184?dopt=Abstract
date added to LUP
2015-01-08 18:49:01
date last changed
2017-07-30 03:16:32
@article{432095a6-1e38-43b2-8689-cc9998c5dd00,
  abstract     = {Measurements and simulations to investigate the contributing factors to the peak-to-valley (PTV) ratio have been both experimentally determined as well as Monte Carlo simulated for a well-characterised HPGe n-type detector together with a Cs-137 gamma source encapsulated in thin polystyrene. Measurements were carried out in a low-background gamma counting facility at Lund University. The results of the PTV ratio have been compared to distinguish what components or variables in the setup that significantly influence the ratio. In addition to manufacture specifications, the detector components have been examined using planar X-ray, source scanning and computer tomography in order to determine and verify component dimensions when necessary. In spite of these efforts a discrepancy of approximately 25% for thin absorbers in the PTV ratio between measurements and calculations is observed. However, this discrepancy becomes less significant for larger absorbing layers of copper (>1mm). This indicates that it would be difficult to achieve a field calibration for in-situ gamma spectrometry using the PTV ratio that could position a Cs-137 source in soil depth shallower than corresponding 1mm layer of copper. The results also showed that when building a detector in simulations part by part, the inner dead layer, and the contact pin are of great importance for the accuracy of the PTV ratio simulations.},
  author       = {Östlund, Karl and Samuelsson, Christer and Rääf, Christopher},
  issn         = {0969-8043},
  language     = {eng},
  pages        = {94--100},
  publisher    = {Elsevier},
  series       = {Applied Radiation and Isotopes},
  title        = {Experimentally determined vs. Monte Carlo simulated peak-to-valley ratios for a well-characterised n-type HPGe detector.},
  url          = {http://dx.doi.org/10.1016/j.apradiso.2014.09.022},
  volume       = {95},
  year         = {2015},
}