Decommissioning procedures for an 11 MeV self-shielded medical cyclotron after 16 years of working time

R. Calandrino, A. Del Vecchio, A. Savi, S. Todde, V. Griffoni, S. Brambilla, R. Parisi, G. Simone, F. Fazio

Research output: Contribution to journalArticlepeer-review

Abstract

The present article describes the decommissioning of a compact, self-shielded, 11 MeV medical cyclotron. A Monte Carlo simulation of the possible nuclear reactions was performed in order to plan the decommissioning activities. In the course of the cyclotron dismantling, cyclotron components, shields, and floor concrete samples were measured. Residual activities were analyzed with a Ge(Li) detector and compared with simulation data. Doses to staff involved in the decommissioning procedure were monitored by individual TL dosimeters. The simulations identified five radioactive nuclides in shields and floor concrete: 55Fe and 45Ca (beta emitters, total specific activity: 2.29 × 104 Bq kg-1) and 152Eu, 154Eu, 60Co (gamma emitters, total specific activity: 1.62 × 103 Bq kg-1). Gamma-ray spectrometry confirmed the presence of gamma emitters, corresponding to a total specific activity of 3.40 × 102 Bq kg-1. The presence of the radioisotope 124Sb in the lead contained in the shield structure, corresponding to a simulated specific activity of 9.38 × 103 Bq kg-1, was experimentally confirmed. The measured dose from external exposure of the involved staff was

Original languageEnglish
Pages (from-to)588-596
Number of pages9
JournalHealth Physics
Volume90
Issue number6
DOIs
Publication statusPublished - Jun 2006

Keywords

  • Accelerators
  • Accelerators, medical
  • Cyclotron
  • Decommissioned
  • Operational topic

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)
  • Health, Toxicology and Mutagenesis
  • Toxicology
  • Physics and Astronomy (miscellaneous)
  • Public Health, Environmental and Occupational Health
  • Environmental Chemistry
  • Environmental Science(all)

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