Nationwide survey on the operational status of medical compact cyclotrons in Japan

Toshioh Fujibuchi, Ichiro Yamaguchi, Hiroshi Watanabe, Ken Ichi Kimura, Shinji Tanaka, Tetsuo Kida, Hiroaki Nagaoka

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The management of induced radioactivity of the cyclotron itself and structures is an important issue in decommissioning of medical compact cyclotrons. To obtain basic data on the actual operational conditions of cyclotrons, we performed nationwide survey. The actual beam current was about half of the maximum beam current indicated in the official permits for cyclotron operation. The actual operating time was about 10% of the maximum operating time indicated in the official permits. The average daily radioactive-nuclide (18F) production was only 10% of the allowed maximum quantity. From these results, it became clear that the induced radioactivity of a cyclotron and its concrete structures based on the maximum beam current and the maximum operating time may be overestimated. These basic data are expected to be useful for a realistic evaluation and helpful in establishing a rational regulation in regard to radioactive waste control for decommissioning of medical cyclotrons.

Original languageEnglish
Pages (from-to)126-132
Number of pages7
JournalRadiological physics and technology
Issue number2
Publication statusPublished - Jul 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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