Radiation safety management of residual long-lived radioactivity distributed in an inner concrete wall of a medical cyclotron room

Ichiro Yamaguchi, Ken ichi Kimura, Toshioh Fujibuchi, Yasuyuki Takahashi, Kyoko Saito, Hidenori Otake

研究成果: ジャーナルへの寄稿学術誌査読

7 被引用数 (Scopus)

抄録

The depth distribution of residual long-lived radioactivity in the inner concrete wall of a medical cyclotron room was measured by assaying concrete cores. Seven long-lived radioactive nuclides (46Sc, 60Co, 65Zn, 134Cs, 152Eu, 22Na and 54Mn) were identified by gamma-ray spectrometry of the concrete samples. It was confirmed that the gamma-ray-emitting radionuclides induced by thermal neutrons through the (n, γ) reaction are dominant, and that the activity induced by thermal neutrons is greater at a depth of 10-30 cm, rather than at the surface of the concrete, and decreased exponentially beyond a depth of ~40 cm. Although the specific activity at the surface was greater than the clearance level for radioactive waste indicated in IAEA RS-G-1.7, the mean specific activities in the walls and floor were less than the clearance level.

本文言語英語
論文番号ncr129
ページ(範囲)167-169
ページ数3
ジャーナルRadiation Protection Dosimetry
146
1-3
DOI
出版ステータス出版済み - 7月 2011
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 放射線
  • 放射線技術および超音波技術
  • 放射線学、核医学およびイメージング
  • 公衆衛生学、環境および労働衛生

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