Real-time gamma-ray energy spectrum / dose monitor with k-α method based on sequential bayesian estimation

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

doi:https://doi.org/10.1016/j.apradiso.2024.111454

Real-time gamma-ray energy spectrum / dose monitor with k-α method based on sequential bayesian estimation

Murata, Isao; Voulgaris, Nikolaos; Miyoshi, Takaaki et al.

Applied Radiation and Isotopes, 2024, 212, 111454

アクセス数:88件（2025-05-22 22:08 集計）

固定URL: https://hdl.handle.net/11094/98177

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タイトル	Real-time gamma-ray energy spectrum / dose monitor with k-α method based on sequential bayesian estimation
著者	NRID 1000030273600 1000030273600 researchmap permalink read0185261 read0185261 Scopus Author ID 7101662513 7101662513 著者名 Murata, Isao
	著者名 Voulgaris, Nikolaos
	著者名 Miyoshi, Takaaki
	著者名 Shinohara, Moe
	著者名 Nishimura, Hikari
	著者名 Kobayashi, Mina
	NRID 1000030781314 1000030781314 researchmap permalink ks21 ks21 著者名 Kusaka, Sachie
	NRID 1000010823396 1000010823396 researchmap permalink stu417767g stu417767g Scopus Author ID 56785322900 56785322900 著者名 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 著者名 Sato, Fuminobu
内容	Murata I., Voulgaris N., Miyoshi T., et al. Real-time gamma-ray energy spectrum / dose monitor with k-α method based on sequential bayesian estimation. Applied Radiation and Isotopes 212, 111454 (2024); https://doi.org/10.1016/j.apradiso.2024.111454.
抄録	Medical applications of radiation have been widely spread until now. However, the exposure of medical staff is sometimes overlooked, because treatment of patients is the first priority. The purpose of this study is to develop a small and light monitor that can measure the energy spectrum and dose of gamma-rays at the same time in real-time for medical applications. Using the monitor, the medical staff could be guided to be more aware ofthe risk of radiation, and finally the exposure to them could be substantially suppressed. So far, a CsI scintillator has been chosen as a detection device of gamma-rays and combined with a Multi-Pixel Photon Counter (MPPC) to develop a prototype monitor. Then we confirmed its basic performance with standard gamma-ray sources. To achieve the real-time measurement, α method (sequential Bayesian estimation) was adopted and improved to propose a new unfolding process, named k-α method, with which the convergence speed could really be accelerated to realize real-time measurement. Also, gamma-ray measurements with a mixed source of 133Ba, 137Cs and 60Co were carried out to confirm the validity of the present monitor. As a result, it was found that gamma-ray energy spectrum could be estimated successfully in several-tens seconds in the field of around 6 μSv/h. For the dose estimation, the correct values could be estimated just after starting measurement.
出版者	Elsevier Ltd
収録物名	Applied Radiation and Isotopes
巻(号)	212
ページ	111454
刊行年月	2024-10-01
言語	英語
ハンドルURL	https://hdl.handle.net/11094/98177
PISSN	09698043
eISSN	18729800
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.apradiso.2024.111454
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCTERMS.bibliographicCitation	Applied Radiation and Isotopes. 2024, 212, p. 111454
DC.title	Real-time gamma-ray energy spectrum / dose monitor with k-α method based on sequential bayesian estimation
DC.creator	Murata, Isao
	Voulgaris, Nikolaos
	Miyoshi, Takaaki
	Shinohara, Moe
	Nishimura, Hikari
	Kobayashi, Mina
	Kusaka, Sachie
	Tamaki, Shingo
	Sato, Fuminobu
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-10-01
DC.identifier	https://doi.org/10.1016/j.apradiso.2024.111454
DC.description	Murata I., Voulgaris N., Miyoshi T., et al. Real-time gamma-ray energy spectrum / dose monitor with k-α method based on sequential bayesian estimation. Applied Radiation and Isotopes 212, 111454 (2024); https://doi.org/10.1016/j.apradiso.2024.111454.
DCTERMS.abstract	Medical applications of radiation have been widely spread until now. However, the exposure of medical staff is sometimes overlooked, because treatment of patients is the first priority. The purpose of this study is to develop a small and light monitor that can measure the energy spectrum and dose of gamma-rays at the same time in real-time for medical applications. Using the monitor, the medical staff could be guided to be more aware ofthe risk of radiation, and finally the exposure to them could be substantially suppressed. So far, a CsI scintillator has been chosen as a detection device of gamma-rays and combined with a Multi-Pixel Photon Counter (MPPC) to develop a prototype monitor. Then we confirmed its basic performance with standard gamma-ray sources. To achieve the real-time measurement, α method (sequential Bayesian estimation) was adopted and improved to propose a new unfolding process, named k-α method, with which the convergence speed could really be accelerated to realize real-time measurement. Also, gamma-ray measurements with a mixed source of 133Ba, 137Cs and 60Co were carried out to confirm the validity of the present monitor. As a result, it was found that gamma-ray energy spectrum could be estimated successfully in several-tens seconds in the field of around 6 μSv/h. For the dose estimation, the correct values could be estimated just after starting measurement.
DC.rights	This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
DC.format	98177
citation_title	Real-time gamma-ray energy spectrum / dose monitor with k-α method based on sequential bayesian estimation
citation_author	Murata, Isao
	Voulgaris, Nikolaos
	Miyoshi, Takaaki
	Shinohara, Moe
	Nishimura, Hikari
	Kobayashi, Mina
	Kusaka, Sachie
	Tamaki, Shingo
	Sato, Fuminobu
citation_publisher	Elsevier Ltd
citation_language	英語
citation_date	2024-10-01
citation_journal_title	Applied Radiation and Isotopes
citation_volume	212
citation_firstpage	111454
citation_doi	https://doi.org/10.1016/j.apradiso.2024.111454
citation_public_url	https://hdl.handle.net/11094/98177

Real-time gamma-ray energy spectrum / dose monitor with k-α method based on sequential bayesian estimation

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