Induced radioactive nuclides of 10-MeV radiotherapy accelerators detected by using a portable HP-Ge survey meter

Toshioh Fujibuchi, Satoshi Obara, Ichiro Yamaguchi, Masaya Oyama, Hiroshi Watanabe, Takeji Sakae, Kazuaki Katoh

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The radioactivation of linear accelerator components for radiation therapy is interest for radiation protection in general, and particularly, when decommissioning these structures. The energy spectra of gamma rays emitted from the heads of two accelerator models, EXL-15SP and Clinac iX, after 10-MeV X-ray irradiation, were measured using a high-purity germanium semiconductor survey meter. After spectrum analyses, activities of 24Na, 28Al, 54Mn, 56Mn, 57Ni, 58Co, 60Co, 64Cu, 65Zn, 122Sb, 124Sb, 181W, 187W, 196Au, and 198Au were detected. One centimetre deep dose-equivalent rate of the heads of the linear accelerator was measured using the survey meter. The dose rate decreased to ~10 % of its initial rate after 1 week. Long-term activations were few, the radioactivity level was low, and a cooling time of several days was effective for reducing dose rate to an acceptable level for decommissioning.

Original languageEnglish
Article numberncr005
Pages (from-to)168-173
Number of pages6
JournalRadiation Protection Dosimetry
Volume148
Issue number2
DOIs
Publication statusPublished - Jan 2012
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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