Radiologic assessment of a self-shield with boron-containing water for a compact medical cyclotron.

Genki Horitsugi, Toshioh Fujibuchi, Ichiro Yamaguchi, Akihisa Eto, Yasuo Iwamoto, Hiromi Hashimoto, Seiki Hamada, Satoshi Obara, Hiroshi Watanabe, Jun Hatazawa

Research output: Contribution to journalArticle

Abstract

The cyclotron at our hospital has a self-shield of boron-containing water. The amount of induced radioactivity in the boron-containing water shield of a compact medical cyclotron has not yet been reported. In this study, we measured the photon and neutron dose rates outside the self-shield during cyclotron operation. We estimated the induced radioactivities of the boron-containing water used for the self-shield and then measured them. We estimated the activation of concrete outside the self-shield in the cyclotron laboratory. The thermal neutron flux during cyclotron operation was estimated to be 4.72 × 10(2) cm(-2) s(-1), and the activation of concrete in a cyclotron laboratory was about three orders of magnitude lower than the clearance level of RS-G-1.7 (IAEA). The activity concentration of the boron-containing water did not exceed the concentration limit for radioactive isotopes in drainage in Japan and the exemption level for Basic Safety Standards. Consequently, the boron-containing water is treatable as non-radioactive waste. Neutrons were effectively shielded by the self-shield during cyclotron operation.

Original languageEnglish
Pages (from-to)129-137
Number of pages9
JournalRadiological physics and technology
Volume5
Issue number2
DOIs
Publication statusPublished - Jul 2012
Externally publishedYes

Fingerprint

Cyclotrons
Boron
cyclotrons
boron
Water
Neutrons
water
radioactivity
Radioactivity
activation
neutrons
clearances
drainage
flux (rate)
thermal neutrons
Photons
Radioisotopes
radioactive isotopes
Drainage
Japan

All Science Journal Classification (ASJC) codes

  • Radiation
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Radiology Nuclear Medicine and imaging

Cite this

Radiologic assessment of a self-shield with boron-containing water for a compact medical cyclotron. / Horitsugi, Genki; Fujibuchi, Toshioh; Yamaguchi, Ichiro; Eto, Akihisa; Iwamoto, Yasuo; Hashimoto, Hiromi; Hamada, Seiki; Obara, Satoshi; Watanabe, Hiroshi; Hatazawa, Jun.

In: Radiological physics and technology, Vol. 5, No. 2, 07.2012, p. 129-137.

Research output: Contribution to journalArticle

Horitsugi, G, Fujibuchi, T, Yamaguchi, I, Eto, A, Iwamoto, Y, Hashimoto, H, Hamada, S, Obara, S, Watanabe, H & Hatazawa, J 2012, 'Radiologic assessment of a self-shield with boron-containing water for a compact medical cyclotron.', Radiological physics and technology, vol. 5, no. 2, pp. 129-137. https://doi.org/10.1007/s12194-012-0147-4
Horitsugi, Genki ; Fujibuchi, Toshioh ; Yamaguchi, Ichiro ; Eto, Akihisa ; Iwamoto, Yasuo ; Hashimoto, Hiromi ; Hamada, Seiki ; Obara, Satoshi ; Watanabe, Hiroshi ; Hatazawa, Jun. / Radiologic assessment of a self-shield with boron-containing water for a compact medical cyclotron. In: Radiological physics and technology. 2012 ; Vol. 5, No. 2. pp. 129-137.
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