Decontamination of the Activation Product Based on a Legal Revision of the Cyclotron Vault Room on the Non-self-shield Compact Medical Cyclotron

Isao Komiya, Yoshiyuki Umezu, Toshioh Fujibuchi, Kazumasa Nakamura, Shingo Baba, Hiroshi Honda

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

The non-self-shield compact medical cyclotron and the cyclotron vault room were in operation for 27 years. They have now been decommissioned. We efficiently implemented a technique to identify an activation product in the cyclotron vault room. Firstly, the distribution of radioactive concentrations in the concrete of the cyclotron vault room was estimated by calculation from the record of the cyclotron operation. Secondly, the comparison of calculated results with an actual measurement was performed using a NaI scintillation survey meter and a high-purity germanium detector. The calculated values were overestimated as compared to the values measured using the NaI scintillation survey meter and the high-purity germanium detector. However, it could limit the decontamination area. By simulating the activation range, we were able to minimize the concrete core sampling. Finally, the appropriate range of radioactivated area in the cyclotron vault room was decontaminated based on the results of the calculation. After decontamination, the radioactive concentration was below the detection limit value in all areas inside the cyclotron vault room. By these procedures, the decommissioning process of the cyclotron vault room was more efficiently performed.

本文言語英語
ページ(範囲)989-998
ページ数10
ジャーナルNihon Hoshasen Gijutsu Gakkai zasshi
72
10
DOI
出版ステータス出版済み - 1 1 2016

All Science Journal Classification (ASJC) codes

  • 医学(全般)

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