Background components of Ge detectors in Ogoya underground laboratory

Y Hamajima; K Komura

doi:10.1016/j.apradiso.2004.03.041

Background components of Ge detectors in Ogoya underground laboratory

Appl Radiat Isot. 2004 Aug-Sep;61(2-3):179-83. doi: 10.1016/j.apradiso.2004.03.041.

Authors

Y Hamajima¹, K Komura

Affiliation

¹ LLRL, Kanazawa University, Tatsunokuchi 9231224, Japan. hama@cacheibm.s.kanazawa-u.ac.jp

PMID: 15177341
DOI: 10.1016/j.apradiso.2004.03.041

Abstract

Ogoya underground laboratory, (OUL; 270 m water equivalent), has 5 well, 4 planar, and 1 coaxial-type ultra-low background Ge detectors with passive shield of old lead. An anticoincidence system with a plastic scintillator (PS) has been tested to reduce cosmic-ray-induced background. Energy spectra of PSs, coincidence counting rate, and angular distribution of cosmic rays were studied. Based on this study, we propose a new index of Ge surface area-normalized background counting rate (d(-1) cm(-2)) to compare shielding efficiency between different types of Ge detectors.