Laboratory Studies on the Removal of Radon-Born Lead from KamLAND's Organic Liquid Scintillator

G Keefer,Christian D Grant,A Piepke,Tamotsu Ebihara,Hiroaki Ikeda, Y Kishimoto,Y Kibe,Yoshihiko Koseki, Masaaki Ogawa, J Shirai,Satoshi Takeuchi,C Mauger,Chao Zhang,George K Schweitzer,B E Berger,S A Dazeley,M P Decowski,J A Detwiler,Z Djurcic, D A Dwyer,Y V Efremenko, S Enomoto, S J Freedman,B K Fujikawa, K Furuno, A Gando,Y Gando,G Gratta,Susumi Hatakeyama, K M Heeger, Lichung Hsu,Koichi Ichimura, Kenichi Inoue,Tomotada Iwamoto,Y Kamyshkov,H J Karwowski, M Koga,A Kozlov,C Lane, J G Learned,J Maricic, D M Marko, S Matsuno, D Mckee, R D Mckeown,T Miletic,T Mitsui,M Motoki,Kazunori Nakajima, K Nakamura, T Odonnell, H Ogawa,F Piquemal, J S Ricol,Ippei Shimizu, F Suekane, A Suzuki,R Svoboda,O Tajima,Y Takemoto,K Tamae, K Tolich, W Tornow, Hiroko Watanabe,L A Winslow,Satoshi Yoshida

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment（2015）

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摘要

The removal of radioactivity from liquid scintillator has been studied in preparation of a low background phase of KamLAND. This paper describes the methods and techniques developed to measure and efficiently extract radon decay products from liquid scintillator. We report the radio-isotope reduction factors obtained when applying various extraction methods. During this study, distillation was identified as the most efficient method for removing radon-born lead from liquid scintillator.

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关键词

KamLAND,Low background,Purification,Liquid scintillator,Solar neutrinos

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