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Statements

Subject Item
n2:RIV%2F00177016%3A_____%2F14%3A%230000866%21RIV15-MSM-00177016
rdf:type
skos:Concept n17:Vysledek
rdfs:seeAlso
http://www.sciencedirect.com/science/article/pii/S0969806X12005324
dcterms:description
Germanium gamma spectrometers are effective instruments for low-activity measurement of a mixture of radionuclides in environmental samples, food samples, in materials released from nuclear facilities to the environment, etc. In such measurements cosmic rays have a significant contribution to the background signal. A Monte Carlo code MCNPXTM was used to calculate coaxial high-purity germanium (HPGe) detector pulse-height spectra caused by cosmic rays penetrating through shielding made of concrete and lead. Simulations were compared to two different measurements, one performed inside a 10 cm thick lead shielding and another done inside a larger chamber made of low-activity concrete and with several ceiling thicknesses. In the first experiment, a discrepancy was found between simulated and measured spectra by up to the factor of 4 at 2.62 MeV and slowly decreasing to unity at 13 MeV. It is assumed that the discrepancy between the measured and simulated spectra is caused by the simplification of muon energy losses treatment resulting in the underestimation of count rate in simulated pulse-height spectrum. Good agreement was obtained between simulation and measurement of differences of detector count rates in 662 keV and 1332 keV energy windows inside a concrete chamber with varying ceiling thickness. It is assumed that due to lower effective Z of concrete, delta electron bremsstrahlung has lower yield and the muon radiation energy losses start to be important at higher energies than in lead. As a result, the total contribution of these effects to the outputs of MCNPXTM simulations of concrete chamber is not dominant in the investigated energy windows and the simulation results are in a close agreement with the measurement. Germanium gamma spectrometers are effective instruments for low-activity measurement of a mixture of radionuclides in environmental samples, food samples, in materials released from nuclear facilities to the environment, etc. In such measurements cosmic rays have a significant contribution to the background signal. A Monte Carlo code MCNPXTM was used to calculate coaxial high-purity germanium (HPGe) detector pulse-height spectra caused by cosmic rays penetrating through shielding made of concrete and lead. Simulations were compared to two different measurements, one performed inside a 10 cm thick lead shielding and another done inside a larger chamber made of low-activity concrete and with several ceiling thicknesses. In the first experiment, a discrepancy was found between simulated and measured spectra by up to the factor of 4 at 2.62 MeV and slowly decreasing to unity at 13 MeV. It is assumed that the discrepancy between the measured and simulated spectra is caused by the simplification of muon energy losses treatment resulting in the underestimation of count rate in simulated pulse-height spectrum. Good agreement was obtained between simulation and measurement of differences of detector count rates in 662 keV and 1332 keV energy windows inside a concrete chamber with varying ceiling thickness. It is assumed that due to lower effective Z of concrete, delta electron bremsstrahlung has lower yield and the muon radiation energy losses start to be important at higher energies than in lead. As a result, the total contribution of these effects to the outputs of MCNPXTM simulations of concrete chamber is not dominant in the investigated energy windows and the simulation results are in a close agreement with the measurement.
dcterms:title
MCNPX simulation of influence of cosmic rays on low-activity spectrometric measurements MCNPX simulation of influence of cosmic rays on low-activity spectrometric measurements
skos:prefLabel
MCNPX simulation of influence of cosmic rays on low-activity spectrometric measurements MCNPX simulation of influence of cosmic rays on low-activity spectrometric measurements
skos:notation
RIV/00177016:_____/14:#0000866!RIV15-MSM-00177016
n3:aktivita
n7:V n7:R
n3:aktivity
R, V
n3:cisloPeriodika
February 2014
n3:dodaniDat
n15:2015
n3:domaciTvurceVysledku
n5:6049966 n5:1370391 n5:5905567
n3:druhVysledku
n18:J
n3:duvernostUdaju
n6:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
27726
n3:idVysledku
RIV/00177016:_____/14:#0000866
n3:jazykVysledku
n16:eng
n3:klicovaSlova
Cosmic rays; Pulse-height spectrum; Low-activity measurement; Gamma-ray spectrometry; Monte Carlo simulation; MCNPX
n3:klicoveSlovo
n9:Low-activity%20measurement n9:MCNPX n9:Gamma-ray%20spectrometry n9:Monte%20Carlo%20simulation n9:Pulse-height%20spectrum n9:Cosmic%20rays
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[EFC29E0CCDB9]
n3:nazevZdroje
Radiation Physics and Chemistry
n3:obor
n8:BG
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:rokUplatneniVysledku
n15:2014
n3:svazekPeriodika
95
n3:tvurceVysledku
Kovář, Petr Dryák, Pavel Šolc, Jaroslav
s:issn
0969-806X
s:numberOfPages
4
n13:doi
10.1016/j.radphyschem.2012.12.034