Survey Methodology for the Activation of Beamline Components in an Electrostatic Proton Accelerator

Abstract

 To establish a systematic guideline for accelerator decommissioning, as a case study, beamline activation of 12 MeV-proton electrostatic accelerator was investigated employing a survey meter and γ-ray spectrometers. Beam loss points where reflected as high dose-rate area were identified, and generated nuclides and their activities were determined. Almost beamline components are made from stainless steel and ⁵²Mn and ⁵⁶Co were detected as principal induced activities. It was found that the ⁵⁶Co activity significantly contribute to the dose rate value denoted on the survey meter. From the beam operation history and the monitor currents of Faraday-cups, we revealed the beam loss on a certain point significantly reflects the ⁵²Mn activity on there. Induced activities of ⁵²Mn and ⁵⁶Co on the certain point of the beamline could be reproduced by the contact dose-rate on that point.