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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numberncr129
Pages (from-to)167-169
Number of pages3
JournalRadiation Protection Dosimetry
Volume146
Issue number1-3
DOIs
Publication statusPublished - Jul 1 2011
Externally publishedYes

Fingerprint

safety management
Cyclotrons
Safety Management
Gamma Rays
Neutrons
radioactivity
Radioactivity
rooms
cyclotrons
Hot Temperature
Gamma Spectrometry
Radiation
Radioactive Waste
clearances
radiation
thermal neutrons
Radioisotopes
radioactive isotopes
assaying
gamma rays

All Science Journal Classification (ASJC) codes

  • Radiological and Ultrasound Technology
  • Radiation
  • Radiology Nuclear Medicine and imaging
  • Public Health, Environmental and Occupational Health

Cite this

Radiation safety management of residual long-lived radioactivity distributed in an inner concrete wall of a medical cyclotron room. / Yamaguchi, Ichiro; Kimura, Ken ichi; Fujibuchi, Toshioh; Takahashi, Yasuyuki; Saito, Kyoko; Otake, Hidenori.

In: Radiation Protection Dosimetry, Vol. 146, No. 1-3, ncr129, 01.07.2011, p. 167-169.

Research output: Contribution to journalArticle

Yamaguchi, Ichiro ; Kimura, Ken ichi ; Fujibuchi, Toshioh ; Takahashi, Yasuyuki ; Saito, Kyoko ; Otake, Hidenori. / Radiation safety management of residual long-lived radioactivity distributed in an inner concrete wall of a medical cyclotron room. In: Radiation Protection Dosimetry. 2011 ; Vol. 146, No. 1-3. pp. 167-169.
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