Characterization of the X-ray spectrum of a linear accelerator

The Nuclear Measurement Laboratory (LMN) at CEA Cadarache in France uses a high-energy electron linear accelerator, LINAC (9-21 MeV), to characterize nuclear waste drums. It enables to explore new examination modalities, such as active photon interrogation or dualenergy CT to scan large concrete obj...

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Autores principales:	Maulin Maëva, Allinei Pierre Guy, Eck Daniel, Estre Nicolas, Payan Emmanuel, Tisseur David, Kessedjian Grégoire
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	linear electron accelerator high energy computed tomography spectrum characterization linac Physics QC1-999
Acceso en línea:	https://doaj.org/article/5114ec350a0148afab9abe1a2adef2b3
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id	oai:doaj.org-article:5114ec350a0148afab9abe1a2adef2b3
record_format	dspace
spelling	oai:doaj.org-article:5114ec350a0148afab9abe1a2adef2b32021-12-02T17:12:45ZCharacterization of the X-ray spectrum of a linear accelerator2100-014X10.1051/epjconf/202125304002https://doaj.org/article/5114ec350a0148afab9abe1a2adef2b32021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_04002.pdfhttps://doaj.org/toc/2100-014XThe Nuclear Measurement Laboratory (LMN) at CEA Cadarache in France uses a high-energy electron linear accelerator, LINAC (9-21 MeV), to characterize nuclear waste drums. It enables to explore new examination modalities, such as active photon interrogation or dualenergy CT to scan large concrete objects with diameters up to 140 cm. These techniques require precise awareness of the photon spectrum emitted by the LINAC. However, direct measure of this photon energy spectrum cannot be achieved because of the accelerator pulses causing detector saturation. During the last few years, a large number of indirect methods has been developed. From an experimental point of view, the simplest indirect method for spectrum estimation method is ransmission measurements. Because it can be set up easily and accurately using an ionization chamber as well as an appropriate screen. The obtained transmission curve depends on the photon energy spectrum, which can be estimated using inverse models. In this paper, we present the development of a numerical model to determine the energy spectrum from an attenuation curve via transmission measurements which combines two types of inverse models: a continue model and a discrete model. We validate this tool using a test spectrum and its transmission curve obtained via Monte-Carlo simulation. This qualification allowed us to determine its sensitivity (signal-to-noise ratio, SNR) in order to have a good convergence. We show that if the SNR is less than 4%, we have a good estimation of the photon energy spectrum. Then, it was experimentally tested with a transmission curve obtained at the laboratory.Maulin MaëvaAllinei Pierre GuyEck DanielEstre NicolasPayan EmmanuelTisseur DavidKessedjian GrégoireEDP Sciencesarticlelinear electron acceleratorhigh energy computed tomographyspectrum characterizationlinacPhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 04002 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	linear electron accelerator high energy computed tomography spectrum characterization linac Physics QC1-999
spellingShingle	linear electron accelerator high energy computed tomography spectrum characterization linac Physics QC1-999 Maulin Maëva Allinei Pierre Guy Eck Daniel Estre Nicolas Payan Emmanuel Tisseur David Kessedjian Grégoire Characterization of the X-ray spectrum of a linear accelerator
description	The Nuclear Measurement Laboratory (LMN) at CEA Cadarache in France uses a high-energy electron linear accelerator, LINAC (9-21 MeV), to characterize nuclear waste drums. It enables to explore new examination modalities, such as active photon interrogation or dualenergy CT to scan large concrete objects with diameters up to 140 cm. These techniques require precise awareness of the photon spectrum emitted by the LINAC. However, direct measure of this photon energy spectrum cannot be achieved because of the accelerator pulses causing detector saturation. During the last few years, a large number of indirect methods has been developed. From an experimental point of view, the simplest indirect method for spectrum estimation method is ransmission measurements. Because it can be set up easily and accurately using an ionization chamber as well as an appropriate screen. The obtained transmission curve depends on the photon energy spectrum, which can be estimated using inverse models. In this paper, we present the development of a numerical model to determine the energy spectrum from an attenuation curve via transmission measurements which combines two types of inverse models: a continue model and a discrete model. We validate this tool using a test spectrum and its transmission curve obtained via Monte-Carlo simulation. This qualification allowed us to determine its sensitivity (signal-to-noise ratio, SNR) in order to have a good convergence. We show that if the SNR is less than 4%, we have a good estimation of the photon energy spectrum. Then, it was experimentally tested with a transmission curve obtained at the laboratory.
format	article
author	Maulin Maëva Allinei Pierre Guy Eck Daniel Estre Nicolas Payan Emmanuel Tisseur David Kessedjian Grégoire
author_facet	Maulin Maëva Allinei Pierre Guy Eck Daniel Estre Nicolas Payan Emmanuel Tisseur David Kessedjian Grégoire
author_sort	Maulin Maëva
title	Characterization of the X-ray spectrum of a linear accelerator
title_short	Characterization of the X-ray spectrum of a linear accelerator
title_full	Characterization of the X-ray spectrum of a linear accelerator
title_fullStr	Characterization of the X-ray spectrum of a linear accelerator
title_full_unstemmed	Characterization of the X-ray spectrum of a linear accelerator
title_sort	characterization of the x-ray spectrum of a linear accelerator
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/5114ec350a0148afab9abe1a2adef2b3
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Characterization of the X-ray spectrum of a linear accelerator

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