title: Ogoya underground laboratory for the measurement of extremely low levels of environmental radioactivity: review of recent projects carried out at OUL.
abstract: Recent topical measurements performed in the Ogoya Underground Laboratory are briefly summarized. The paper deals mainly with the following topics: measurements of variations of airborne 222Rn, 210Pb, 210Po and 7Be with high temporal resolution; the depth profile of 137Cs in Pacific water collected in 1957; cosmic-ray-induced 22Na in surface air, rain, river and lake waters; 152Eu in granite exposed to the Atomic Bomb in Hiroshima in 1945; and depleted uranium used in the Iraq War 2003.
authors.affiliation: Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Wake, Tatsunokuchi, Ishikawa 923-1224, Japan. komurak@po.incl.ne.jp
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Komura
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Hamajima