Study of Neutron Background in order to Improve Radioactive Waste Drum Characterization

A usual way of radioactive waste drums characterization combines gamma spectrometry measurements with passive neutron measurements. The CEA facility for waste drum characterization hereby described has been operated for more than 30 years. In this framework, a large variety of waste drums has been c...

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Autor principal:	Lelaizant Gabrielle
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	neutron background coincidence counting radioactive waste characterization cosmic-ray induced neutrons Physics QC1-999
Acceso en línea:	https://doaj.org/article/197359098da9420fbf86f7b92aca6dc6
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spelling	oai:doaj.org-article:197359098da9420fbf86f7b92aca6dc62021-12-02T17:12:46ZStudy of Neutron Background in order to Improve Radioactive Waste Drum Characterization2100-014X10.1051/epjconf/202125308004https://doaj.org/article/197359098da9420fbf86f7b92aca6dc62021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_08004.pdfhttps://doaj.org/toc/2100-014XA usual way of radioactive waste drums characterization combines gamma spectrometry measurements with passive neutron measurements. The CEA facility for waste drum characterization hereby described has been operated for more than 30 years. In this framework, a large variety of waste drums has been characterized in terms of spectra, densities, materials and radioactivity levels. As the facility was first dedicated to measure Intermediate-Level Long-lived Waste, the neutron background was not significant compared to expected neutron emitters from waste packages. These last years, Dismantling and Decommissioning operations have been advanced in this CEA site to the point where they are now associated with mostly Very Low Level Waste production. Therefore, neutron background is becoming significant. Using the large variety of past characterized drums brings the opportunity to study this background. The present study has been led over a sample of almost 1500 drums over a wide waste density range. These drums have been selected over the last 20 years by taking into account only one criterion: without any expected neutron emitters from the waste itself. This work first presents the technical settings of the measurement facility before describing the raw data of the measurements. Next, a statistical study over raw data enables to better acknowledge the neutron spallation background behavior in terms of time, density and materials. Ensues a way of using this new knowledge in order to improve how to take into account neutron spallation background in passive neutron measurements of packages of low actinides activities and high densities.Lelaizant GabrielleEDP Sciencesarticleneutron backgroundcoincidence countingradioactive waste characterizationcosmic-ray induced neutronsPhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 08004 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	neutron background coincidence counting radioactive waste characterization cosmic-ray induced neutrons Physics QC1-999
spellingShingle	neutron background coincidence counting radioactive waste characterization cosmic-ray induced neutrons Physics QC1-999 Lelaizant Gabrielle Study of Neutron Background in order to Improve Radioactive Waste Drum Characterization
description	A usual way of radioactive waste drums characterization combines gamma spectrometry measurements with passive neutron measurements. The CEA facility for waste drum characterization hereby described has been operated for more than 30 years. In this framework, a large variety of waste drums has been characterized in terms of spectra, densities, materials and radioactivity levels. As the facility was first dedicated to measure Intermediate-Level Long-lived Waste, the neutron background was not significant compared to expected neutron emitters from waste packages. These last years, Dismantling and Decommissioning operations have been advanced in this CEA site to the point where they are now associated with mostly Very Low Level Waste production. Therefore, neutron background is becoming significant. Using the large variety of past characterized drums brings the opportunity to study this background. The present study has been led over a sample of almost 1500 drums over a wide waste density range. These drums have been selected over the last 20 years by taking into account only one criterion: without any expected neutron emitters from the waste itself. This work first presents the technical settings of the measurement facility before describing the raw data of the measurements. Next, a statistical study over raw data enables to better acknowledge the neutron spallation background behavior in terms of time, density and materials. Ensues a way of using this new knowledge in order to improve how to take into account neutron spallation background in passive neutron measurements of packages of low actinides activities and high densities.
format	article
author	Lelaizant Gabrielle
author_facet	Lelaizant Gabrielle
author_sort	Lelaizant Gabrielle
title	Study of Neutron Background in order to Improve Radioactive Waste Drum Characterization
title_short	Study of Neutron Background in order to Improve Radioactive Waste Drum Characterization
title_full	Study of Neutron Background in order to Improve Radioactive Waste Drum Characterization
title_fullStr	Study of Neutron Background in order to Improve Radioactive Waste Drum Characterization
title_full_unstemmed	Study of Neutron Background in order to Improve Radioactive Waste Drum Characterization
title_sort	study of neutron background in order to improve radioactive waste drum characterization
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/197359098da9420fbf86f7b92aca6dc6
work_keys_str_mv	AT lelaizantgabrielle studyofneutronbackgroundinordertoimproveradioactivewastedrumcharacterization
_version_	1718381363920371712

Study of Neutron Background in order to Improve Radioactive Waste Drum Characterization

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