Evaluation of induced activity in various components of a PET-cyclotron

For decommissioning a cyclotron facility, it is important to evaluate the induced activity of the various components of the cyclotron; however, activation of the metal components has been rarely investigated. In this study, two types of cyclotrons were examined; one is a proton acceleration type usi...

Full description

Saved in:
Bibliographic Details
Published inJournal of physics. Conference series Vol. 1046; no. 1; pp. 12017 - 12025
Main Authors Toyoda, A., Yoshida, G., Matsumura, H., Masumoto, K., Nakabayashi, T., Yagishita, T., Sasaki, H.
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.06.2018
Subjects
Clearances
Coils
Coils (strip)
Cyclotrons
Evaluation
Foils
Germanium
Physics
Radioactivity
Vacuum chambers
Online AccessGet full text

Cover

More Information
Summary:For decommissioning a cyclotron facility, it is important to evaluate the induced activity of the various components of the cyclotron; however, activation of the metal components has been rarely investigated. In this study, two types of cyclotrons were examined; one is a proton acceleration type using a deflector, and another is a hydride ion (H-) acceleration type using a carbon stripper foil for beam extraction to the target port. The samples were obtained from various metal components such as the yoke, sector magnet, coil, and vacuum chamber by the core boring method, and the depth distribution of the radioactivity was determined via a germanium semiconductor detector. The activities of 54Mn and 60Co were detected from the surface to a deeper site of the yoke and sector magnet. Most of the observed activities of the cyclotron components were higher than the clearance levels, suggesting that a clearance system should not be applied to the yoke and sector magnet. In the case of a high-activity sample, we have to wait for 30 years to reach the clearance level.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1046/1/012017