Feasibility study on using imaging plates to estimate thermal neutron fluence in neutron-gamma mixed fields

Toshioh Fujibuchi, Yu Tanabe, Takeji Sakae, Toshiyuki Terunuma, Tomonori Isobe, Hiraku Kawamura, Kiyoshi Yasuoka, Tetsuro Matsumoto, Hideki Harano, Jun Nishiyama, Akihiko Masuda, Akihiro Nohtomi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In current radiotherapy, neutrons are produced in a photonuclear reaction when incident photon energy is higher than the threshold. In the present study, a method of discriminating the neutron component was investigated using an imaging plate (IP) in the neutron-gamma-ray mixed field. Two types of IP were used: a conventional IP for beta- and gamma rays, and an IP doped with Gd for detecting neutrons. IPs were irradiated in the mixed field, and the photo-stimulated luminescence (PSL) intensity of the thermal neutron component was discriminated using an expression proposed herein. The PSL intensity of the thermal neutron component was proportional to thermal neutron fluence. When additional irradiation of photons was added to constant neutron irradiation, the PSL intensity of the thermal neutron component was not affected. The uncertainty of PSL intensities was approximately 11.4 %. This method provides a simple and effective means of discriminating the neutron component in a mixed field.

Original languageEnglish
Article numberncq493
Pages (from-to)394-400
Number of pages7
JournalRadiation Protection Dosimetry
Volume147
Issue number3
DOIs
Publication statusPublished - Nov 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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