Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG55] Crustal fluids and deformation

Thu. May 30, 2019 9:00 AM - 10:30 AM A11 (TOKYO BAY MAKUHARI HALL)

convener:Yuichi Kitagawa(Tectono-Hydrology Research Group, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Naoji Koizumi(School of Environmental Science,the University of Shiga Prefecture), Koji Umeda(Hirosaki University), Fumiaki Tsunomori(Geochemical Research Center, Graduate School of Science, University of Tokyo), Chairperson:Yuichi Kitagawa(産業技術総合研究所地質調査総合センター地震地下水研究グループ), Fumiaki Tsunomori(東京大学大学院理学系研究科地殻化学実験施設)

9:50 AM - 10:05 AM

[SCG55-04] Development of Radium Concentration Monitoring System based on Gamma-Ray Spectroscopy

*Fumiaki Tsunomori1, Shigekazu Nagai2, Junji Yoshii3, Yoshihide Kimura4, Yoriyuki Kamakura5, Yuki Inoue5, Norihito Sato6, Shiro Sakuragi7, Ryuichi Shimizu8, V N Gluchschenko9 (1.Geochemical Research Center, Graduate School of Science, University of Tokyo, 2.Graduate School of Engineering, Mie University, 3.Advanced Clinical Research Center, Fukushima Medical University, 4.Graduate School of Engineering, Osaka University, 5.Faculty of Information Science and Technology, Osaka Institute of Technology, 6.Chiyoda Technol corp., 7.Union Material Inc., 8.Office for University-Industry Collaboration, Osaka University, 9.Institute of Nuclear Physics, Almaty, Republic of Kazakhstan)

Keywords:Soil Radium Concentration, Gamma-Ray Spectroscopy

We have developed a radium concentration monitoring system in order to analyze a radium concentration in soil samples based on a gamma-ray spectrum. A gamma-ray spectrum of a soil sample was measured by a SrI2 solid scintillator equipped by a multi-pixel photon counter (hereinafter a detector). The detector was shielded by 5cm-thick lead brocks, because 214-bismuth, which is a daughter elements of radium contained in cement materials, emits strong gamma-ray. We have achieved 80% background reduction. We prepared a calibration curve in order to determine a soil radium concentration by a peak area of 214-bismuth in a gamma-ray spectrum of JG-1 geochemical reference sample (AIST, GSJ). We are going to have a discussion to improve problems of this system.