Experimental verification of real-time gamma-ray energy spectrum and dose monitor

Nishimura, Hikari; Shinohara, Moe; Miyoshi, Takaaki; Voulgaris, Nikolaos; Kusaka, Sachie; Tamaki, Shingo; Sato, Fuminobu; Murata, Isao

doi:https://doi.org/10.1016/j.apradiso.2022.110226

Experimental verification of real-time gamma-ray energy spectrum and dose monitor

Nishimura, Hikari; Shinohara, Moe; Miyoshi, Takaaki et al.

Applied Radiation and Isotopes, 2022, 185, 110226

Number of Access:879（2025-08-14 00:09 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/88480

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Title	Experimental verification of real-time gamma-ray energy spectrum and dose monitor
Creator	CreatorName Nishimura, Hikari
	CreatorName Shinohara, Moe
	CreatorName Miyoshi, Takaaki
	CreatorName Voulgaris, Nikolaos
	NRID 1000030781314 1000030781314 CreatorName Kusaka, Sachie
	NRID 1000010823396 1000010823396 researchmap permalink stu417767g stu417767g Scopus Author ID 56785322900 56785322900 CreatorName Tamaki, Shingo
	NRID 1000040332746 1000040332746 ORCID 0000-0001-9582-4915 0000-0001-9582-4915 researchmap permalink sato_fuminobu sato_fuminobu Scopus Author ID 7402130720 7402130720 CreatorName Sato, Fuminobu
	NRID 1000030273600 1000030273600 researchmap permalink read0185261 read0185261 Scopus Author ID 7101662513 7101662513 CreatorName Murata, Isao
Subject	Laser ultrasonic
	Tungsten inert gas (TIG) arc spot welding
	In-process measurement
	High-temperature
Abstract	The purpose of this study is to develop a portable monitor that can measure the energy spectrum and dose of gamma-rays simultaneously in real time for the benefit of medical staff who must work in clinical radiation environments. For this purpose, we have developed a prototype monitor using a CsI (Tl) scintillator combined with a multi-pixel photon counter (MPPC). For real-time measurement, we employed an improved sequential Bayesian estimation (k-α method) to convert the measured pulse height spectrum into an energy spectrum. Then we confirmed that reconstruction of the energy spectrum and dose estimation could simultaneously be carried out in real time by the k-α method in a radiation field composed of mixed standard gamma-ray sources. In this study, we carried out measurements in a background gamma-ray field to confirm applicability of the prototype monitor to the weakest type of radiation field. In addition, we conducted measurements in front of a nuclear fuel storage room (∼2 μSv/h) in the authors’ laboratory to evaluate practicality of the monitor for measuring fields with a complex energy spectrum. As a result, it was found that the dose could be estimated in about 20 s after start of measurements even in the background field. For the energy spectrum, it was instantly reconstructed within 60 s in front of the fuel storage room. On the other hand, it could successfully be estimated within 10 min in the background gamma-ray field. Currently, the convergence of the energy spectrum is determined visually from time dependent change of the spectrum and dose. As a next step, we will attempt to develop a more quantitative procedure for determining the convergence.
Publisher	Elsevier
Source Title	Applied Radiation and Isotopes
Volume (Issue)	185
Page	110226
Date of Issued	2022-07
Language	English
Handle URL	https://hdl.handle.net/11094/88480
PISSN	09698043
eISSN	18729800
Relation.isVersionOf	DOI (Publisher Version) https://doi.org/10.1016/j.apradiso.2022.110226
Relation.isIdenticalTo	PMID 35533616
Access Rights	open access
CopyRight	© 2022. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
oaire:version	Accepted Manuscript
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Applied Radiation and Isotopes. 2022, 185, p. 110226
DC.title	Experimental verification of real-time gamma-ray energy spectrum and dose monitor
DC.creator	Nishimura, Hikari
	Shinohara, Moe
	Miyoshi, Takaaki
	Voulgaris, Nikolaos
	Kusaka, Sachie
	Tamaki, Shingo
	Sato, Fuminobu
	Murata, Isao
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2022-07
DC.identifier	https://doi.org/10.1016/j.apradiso.2022.110226
DC.subject	Laser ultrasonic
	Tungsten inert gas (TIG) arc spot welding
	In-process measurement
	High-temperature
DCTERMS.abstract	The purpose of this study is to develop a portable monitor that can measure the energy spectrum and dose of gamma-rays simultaneously in real time for the benefit of medical staff who must work in clinical radiation environments. For this purpose, we have developed a prototype monitor using a CsI (Tl) scintillator combined with a multi-pixel photon counter (MPPC). For real-time measurement, we employed an improved sequential Bayesian estimation (k-α method) to convert the measured pulse height spectrum into an energy spectrum. Then we confirmed that reconstruction of the energy spectrum and dose estimation could simultaneously be carried out in real time by the k-α method in a radiation field composed of mixed standard gamma-ray sources. In this study, we carried out measurements in a background gamma-ray field to confirm applicability of the prototype monitor to the weakest type of radiation field. In addition, we conducted measurements in front of a nuclear fuel storage room (∼2 μSv/h) in the authors’ laboratory to evaluate practicality of the monitor for measuring fields with a complex energy spectrum. As a result, it was found that the dose could be estimated in about 20 s after start of measurements even in the background field. For the energy spectrum, it was instantly reconstructed within 60 s in front of the fuel storage room. On the other hand, it could successfully be estimated within 10 min in the background gamma-ray field. Currently, the convergence of the energy spectrum is determined visually from time dependent change of the spectrum and dose. As a next step, we will attempt to develop a more quantitative procedure for determining the convergence.
DC.rights	© 2022. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
DC.format	88480
citation_title	Experimental verification of real-time gamma-ray energy spectrum and dose monitor
citation_author	Nishimura, Hikari
	Shinohara, Moe
	Miyoshi, Takaaki
	Voulgaris, Nikolaos
	Kusaka, Sachie
	Tamaki, Shingo
	Sato, Fuminobu
	Murata, Isao
citation_publisher	Elsevier
citation_language	English
citation_date	2022-07
citation_journal_title	Applied Radiation and Isotopes
citation_volume	185
citation_firstpage	110226
citation_doi	https://doi.org/10.1016/j.apradiso.2022.110226
citation_pmid	35533616
citation_public_url	https://hdl.handle.net/11094/88480

Experimental verification of real-time gamma-ray energy spectrum and dose monitor

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