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In-situ evaluation for activated concrete in accelerator facility with scintillation-type gamma-ray spectrometer

辐射防护 2020年第6期40卷 545-549页

作者： Go Yoshida Hiroshi Matsumura Koichi Nishikawa Akihiro Toyoda Yoshiharu Miyazaki Kazuyoshi Masumoto Hajime Nakamura Taichi Miura High Energy Accelerator Research Organization(KEK) 1-1 OhoTsukubaIbaraki 305-0801Japan The Medical and Pharmacological Research Center Foundation Wo-32Inoyama-machiHakuiIshikawa 925-0613Japan

The assessment of activated concrete is particularly difficult during the decommissioning of an accelerator *** analysis by core boring is the only method of investigating the activity of concrete *** address this problem,an in-situ and nondestructive analysis method was developed to determineγ-ray-emitting nuclides and their specific activities in the concrete walls and floor by using a portable germanium semiconductor *** this work,we examined a substitute for Ge detector to establish a simpler and more convenient *** candidates,we focused on some scintillation type spectrometers,and the possibility of a substitute for a Ge detector was examined by both simulation and *** detection limits were roughly estimated through Monte Carlo simulation for various scintillation crystals,and it was found that 1.5-inch LaBr3,CeBr3,and SrI2 could distinguish the clearance *** was confirmed that the 1.5-inch LaBr3 could reproduce the calibration curve of the Ge detector in the *** required thickness and length of the radiation shield for suppressing the background radiation during the measurement was also determined for the convenience of an actual decommissioning work.

关键词： activation accelerator concrete scintillation detector phits code

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