Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codes

The Neutron Measurements Laboratory at the Nuclear Engineering Department of the Polytechnic University of Madrid consists of a bunker-like room and was built for neutron dosimetry research purposes and measurements. The facility includes a 74-GBq 241Am–Be neutron source placed inside a neutron Howi...

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Authors: Barros, Silvia, Gallego Díaz, Eduardo, Lorente, Alfredo, Goncalves, Isabel, Vaz, Pedro, Vega Carrillo, Héctor René
Format: article
Status:Published version
Publication Date:2012
Country:México
Institution:Universidad Autónoma de Zacatecas
Repository:Repositorio Institucional Caxcán
Language:English
OAI Identifier:oai:http://ricaxcan.uaz.edu.mx:20.500.11845/764
Online Access:http://localhost/xmlui/handle/20.500.11845/764
https://doi.org/10.48779/dh8a-0j83
Access Level:Open access
Keyword:CIENCIAS FISICO MATEMATICAS Y CIENCIAS DE LA TIERRA [1]
neutron dosimetry research
Bonner sphere spectrometer (BSS)
neutron fluence spectra
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spelling Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codesBarros, SilviaGallego Díaz, EduardoLorente, AlfredoGoncalves, IsabelVaz, PedroVega Carrillo, Héctor RenéCIENCIAS FISICO MATEMATICAS Y CIENCIAS DE LA TIERRA [1]neutron dosimetry researchBonner sphere spectrometer (BSS)neutron fluence spectraThe Neutron Measurements Laboratory at the Nuclear Engineering Department of the Polytechnic University of Madrid consists of a bunker-like room and was built for neutron dosimetry research purposes and measurements. The facility includes a 74-GBq 241Am–Be neutron source placed inside a neutron Howitzer container. The source can be moved to the irradiation or to the storage position. In this work, a Bonner sphere spectrometer (BSS) was used to measure the neutron fluence spectra with the source in both positions. Ambient dose equivalent rates, H *(10), were measured using a calibrated neutron area monitor LB6411 (Berthold). The measured count rates were used as input to the NSDann and NSDUAZ unfolding programs to obtain the neutron fluence spectra and H *(10). Monte Carlo (MC) simulation methods were used to model the system and to calculate the neutron fluence rate and the ambient dose equivalent rate at the measurement points. The comparison between NSDUAZ and NSDann resulted in relative deviations up to 6.87 % in the total neutron fluence rate and 7.18 % in H *(10) values, despite the differences in the shape of the spectra obtained for the irradiation position. Comparing with the measured values, the H *(10) values obtained with the unfolding programs exhibit a maximum relative deviation of 12.19 %. Taking into account the associated uncertainties, MC simulations seem to be in reasonable agreement with measurements. A maximum relative deviation of 15.65 % between computed and measured H *(10) values was obtained. The computed count rates were applied to the unfolding programs to calculate the total neutron fluence rate and a maximum deviation of 12.83 % was obtained between the original values calculated by NSDann. A sensitivity test showed that the NSDann unfolding program is very sensitive to the uncertainties of the BSS count rates.Oxford Academichttps://orcid.org/0000-0002-7081-908462072019-03-14T18:19:37Z2019-03-14T18:19:37Z2012-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfinfo:eu-repo/semantics/publishedVersion1742-34060144-8420http://localhost/xmlui/handle/20.500.11845/764https://doi.org/10.48779/dh8a-0j83Radiation Protection Dosimetry, Vol. 154, No 3, 2012, pp. 346-355reponame:Repositorio Institucional Caxcáninstname:Universidad Autónoma de Zacatecasinstacron:UAZenggeneralPublicGlobalAtribución-NoComercial-CompartirIgual 3.0 Estados Unidos de Américahttp://creativecommons.org/licenses/by-nc-sa/3.0/us/info:eu-repo/semantics/openAccessoai:http://ricaxcan.uaz.edu.mx:20.500.11845/7642024-08-28T03:21:55Z
dc.title.none.fl_str_mv Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codes
title Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codes
spellingShingle Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codes
Barros, Silvia
CIENCIAS FISICO MATEMATICAS Y CIENCIAS DE LA TIERRA [1]
neutron dosimetry research
Bonner sphere spectrometer (BSS)
neutron fluence spectra
title_short Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codes
title_full Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codes
title_fullStr Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codes
title_full_unstemmed Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codes
title_sort Dosimetric assessment and characterisation of the neutron field around a Howitzer container using a bonner sphere spectometrer, Monte Carlo simulations and the NSDANN and NSDUAZ unfolding codes
dc.creator.none.fl_str_mv Barros, Silvia
Gallego Díaz, Eduardo
Lorente, Alfredo
Goncalves, Isabel
Vaz, Pedro
Vega Carrillo, Héctor René
author Barros, Silvia
author_facet Barros, Silvia
Gallego Díaz, Eduardo
Lorente, Alfredo
Goncalves, Isabel
Vaz, Pedro
Vega Carrillo, Héctor René
author_role author
author2 Gallego Díaz, Eduardo
Lorente, Alfredo
Goncalves, Isabel
Vaz, Pedro
Vega Carrillo, Héctor René
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv https://orcid.org/0000-0002-7081-9084
6207
dc.subject.none.fl_str_mv CIENCIAS FISICO MATEMATICAS Y CIENCIAS DE LA TIERRA [1]
neutron dosimetry research
Bonner sphere spectrometer (BSS)
neutron fluence spectra
topic CIENCIAS FISICO MATEMATICAS Y CIENCIAS DE LA TIERRA [1]
neutron dosimetry research
Bonner sphere spectrometer (BSS)
neutron fluence spectra
description The Neutron Measurements Laboratory at the Nuclear Engineering Department of the Polytechnic University of Madrid consists of a bunker-like room and was built for neutron dosimetry research purposes and measurements. The facility includes a 74-GBq 241Am–Be neutron source placed inside a neutron Howitzer container. The source can be moved to the irradiation or to the storage position. In this work, a Bonner sphere spectrometer (BSS) was used to measure the neutron fluence spectra with the source in both positions. Ambient dose equivalent rates, H *(10), were measured using a calibrated neutron area monitor LB6411 (Berthold). The measured count rates were used as input to the NSDann and NSDUAZ unfolding programs to obtain the neutron fluence spectra and H *(10). Monte Carlo (MC) simulation methods were used to model the system and to calculate the neutron fluence rate and the ambient dose equivalent rate at the measurement points. The comparison between NSDUAZ and NSDann resulted in relative deviations up to 6.87 % in the total neutron fluence rate and 7.18 % in H *(10) values, despite the differences in the shape of the spectra obtained for the irradiation position. Comparing with the measured values, the H *(10) values obtained with the unfolding programs exhibit a maximum relative deviation of 12.19 %. Taking into account the associated uncertainties, MC simulations seem to be in reasonable agreement with measurements. A maximum relative deviation of 15.65 % between computed and measured H *(10) values was obtained. The computed count rates were applied to the unfolding programs to calculate the total neutron fluence rate and a maximum deviation of 12.83 % was obtained between the original values calculated by NSDann. A sensitivity test showed that the NSDann unfolding program is very sensitive to the uncertainties of the BSS count rates.
publishDate 2012
dc.date.none.fl_str_mv 2012-12
2019-03-14T18:19:37Z
2019-03-14T18:19:37Z
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv info:eu-repo/semantics/publishedVersion
1742-3406
0144-8420
http://localhost/xmlui/handle/20.500.11845/764
https://doi.org/10.48779/dh8a-0j83
identifier_str_mv info:eu-repo/semantics/publishedVersion
1742-3406
0144-8420
url http://localhost/xmlui/handle/20.500.11845/764
https://doi.org/10.48779/dh8a-0j83
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv generalPublic
dc.rights.none.fl_str_mv Atribución-NoComercial-CompartirIgual 3.0 Estados Unidos de América
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-NoComercial-CompartirIgual 3.0 Estados Unidos de América
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.coverage.none.fl_str_mv Global
dc.publisher.none.fl_str_mv Oxford Academic
publisher.none.fl_str_mv Oxford Academic
dc.source.none.fl_str_mv Radiation Protection Dosimetry, Vol. 154, No 3, 2012, pp. 346-355
reponame:Repositorio Institucional Caxcán
instname:Universidad Autónoma de Zacatecas
instacron:UAZ
instname_str Universidad Autónoma de Zacatecas
instacron_str UAZ
institution UAZ
reponame_str Repositorio Institucional Caxcán
collection Repositorio Institucional Caxcán
repository.name.fl_str_mv
repository.mail.fl_str_mv
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