Journal Article

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 and Hidenori Otake

in Radiation Protection Dosimetry

Volume 146, issue 1-3, pages 167-169
Published in print July 2011 | ISSN: 0144-8420
Published online April 2011 | e-ISSN: 1742-3406 | DOI: http://dx.doi.org/10.1093/rpd/ncr129
Radiation safety management of residual long-lived radioactivity distributed in an inner concrete wall of a medical cyclotron room

More Like This

Show all results sharing this subject:

  • Nuclear Chemistry, Photochemistry, and Radiation

GO

Show Summary Details

Preview

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.

Journal Article.  1844 words.  Illustrated.

Subjects: Nuclear Chemistry, Photochemistry, and Radiation

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.