Monte Carlo simulation of activity measurements by means of 4pb-g coincidence system
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Physics |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332004000500038 |
Resumo: | The methodology for simulating all detection processes in a 4<FONT FACE=Symbol>pb-g</FONT> coincidence system by means of the Monte Carlo technique is described. The goal is to predict the behavior of the observed activity as a function of the 4<FONT FACE=Symbol>pb</FONT> detector efficiency. In this approach, the information contained in the decay scheme is used for determining the contribution of all radiations emitted by the selected radionuclide, to the measured spectra by each detector. This simulation yields the shape of the coincidence spectrum, allowing the choice of suitable gamma-ray windows for which the activity can be obtained with maximum accuracy. The simulation can predict a detailed description of the extrapolation curve, mainly in the region where the 4<FONT FACE=Symbol>pb</FONT> detector efficiency approaches 100%, which is experimentally unreachable due to self absorption of low energy electrons in the radioactive source substrate. The theoretical work is being developed with MCNP Monte Carlo code, applied to a gas-flow proportional counter of 4pi geometry, coupled to a pair of NaI(Tl) crystals. The calculated efficiencies are compared to experimental results. The extrapolation curve can be obtained by means of another Monte Carlo algorithm, being developed in the present work, to take into account fundamental characteristics of a complex decay scheme, including different types of radiation and transitions. The present paper shows preliminary calculated values obtained by the simulation and compared to predicted analytical values for a simple decay scheme. |
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Brazilian Journal of Physics |
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Monte Carlo simulation of activity measurements by means of 4pb-g coincidence systemThe methodology for simulating all detection processes in a 4<FONT FACE=Symbol>pb-g</FONT> coincidence system by means of the Monte Carlo technique is described. The goal is to predict the behavior of the observed activity as a function of the 4<FONT FACE=Symbol>pb</FONT> detector efficiency. In this approach, the information contained in the decay scheme is used for determining the contribution of all radiations emitted by the selected radionuclide, to the measured spectra by each detector. This simulation yields the shape of the coincidence spectrum, allowing the choice of suitable gamma-ray windows for which the activity can be obtained with maximum accuracy. The simulation can predict a detailed description of the extrapolation curve, mainly in the region where the 4<FONT FACE=Symbol>pb</FONT> detector efficiency approaches 100%, which is experimentally unreachable due to self absorption of low energy electrons in the radioactive source substrate. The theoretical work is being developed with MCNP Monte Carlo code, applied to a gas-flow proportional counter of 4pi geometry, coupled to a pair of NaI(Tl) crystals. The calculated efficiencies are compared to experimental results. The extrapolation curve can be obtained by means of another Monte Carlo algorithm, being developed in the present work, to take into account fundamental characteristics of a complex decay scheme, including different types of radiation and transitions. The present paper shows preliminary calculated values obtained by the simulation and compared to predicted analytical values for a simple decay scheme.Sociedade Brasileira de Física2004-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332004000500038Brazilian Journal of Physics v.34 n.3a 2004reponame:Brazilian Journal of Physicsinstname:Sociedade Brasileira de Física (SBF)instacron:SBF10.1590/S0103-97332004000500038info:eu-repo/semantics/openAccessTakeda,Mauro N.Dias,Mauro S.Koskinas,Marina F.eng2004-10-26T00:00:00Zoai:scielo:S0103-97332004000500038Revistahttp://www.sbfisica.org.br/v1/home/index.php/pt/ONGhttps://old.scielo.br/oai/scielo-oai.phpsbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br1678-44480103-9733opendoar:2004-10-26T00:00Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF)false |
dc.title.none.fl_str_mv |
Monte Carlo simulation of activity measurements by means of 4pb-g coincidence system |
title |
Monte Carlo simulation of activity measurements by means of 4pb-g coincidence system |
spellingShingle |
Monte Carlo simulation of activity measurements by means of 4pb-g coincidence system Takeda,Mauro N. |
title_short |
Monte Carlo simulation of activity measurements by means of 4pb-g coincidence system |
title_full |
Monte Carlo simulation of activity measurements by means of 4pb-g coincidence system |
title_fullStr |
Monte Carlo simulation of activity measurements by means of 4pb-g coincidence system |
title_full_unstemmed |
Monte Carlo simulation of activity measurements by means of 4pb-g coincidence system |
title_sort |
Monte Carlo simulation of activity measurements by means of 4pb-g coincidence system |
author |
Takeda,Mauro N. |
author_facet |
Takeda,Mauro N. Dias,Mauro S. Koskinas,Marina F. |
author_role |
author |
author2 |
Dias,Mauro S. Koskinas,Marina F. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Takeda,Mauro N. Dias,Mauro S. Koskinas,Marina F. |
description |
The methodology for simulating all detection processes in a 4<FONT FACE=Symbol>pb-g</FONT> coincidence system by means of the Monte Carlo technique is described. The goal is to predict the behavior of the observed activity as a function of the 4<FONT FACE=Symbol>pb</FONT> detector efficiency. In this approach, the information contained in the decay scheme is used for determining the contribution of all radiations emitted by the selected radionuclide, to the measured spectra by each detector. This simulation yields the shape of the coincidence spectrum, allowing the choice of suitable gamma-ray windows for which the activity can be obtained with maximum accuracy. The simulation can predict a detailed description of the extrapolation curve, mainly in the region where the 4<FONT FACE=Symbol>pb</FONT> detector efficiency approaches 100%, which is experimentally unreachable due to self absorption of low energy electrons in the radioactive source substrate. The theoretical work is being developed with MCNP Monte Carlo code, applied to a gas-flow proportional counter of 4pi geometry, coupled to a pair of NaI(Tl) crystals. The calculated efficiencies are compared to experimental results. The extrapolation curve can be obtained by means of another Monte Carlo algorithm, being developed in the present work, to take into account fundamental characteristics of a complex decay scheme, including different types of radiation and transitions. The present paper shows preliminary calculated values obtained by the simulation and compared to predicted analytical values for a simple decay scheme. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-09-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332004000500038 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332004000500038 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-97332004000500038 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
dc.source.none.fl_str_mv |
Brazilian Journal of Physics v.34 n.3a 2004 reponame:Brazilian Journal of Physics instname:Sociedade Brasileira de Física (SBF) instacron:SBF |
instname_str |
Sociedade Brasileira de Física (SBF) |
instacron_str |
SBF |
institution |
SBF |
reponame_str |
Brazilian Journal of Physics |
collection |
Brazilian Journal of Physics |
repository.name.fl_str_mv |
Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF) |
repository.mail.fl_str_mv |
sbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br |
_version_ |
1754734861220839424 |