title: Radiological states around the Kraton-4 underground nuclear explosion site in Sakha.
abstract: A radiological survey around the site of Kraton-4, an underground nuclear explosion (Yield of 20 kt, depth of 560 m, 1978) in Sakha was carried out in March 1998. Gamma survey and in-situ spectroscopy on the ground exhibited quite normal levels: a dose rate of 0.022 microSv/h and Cs-137 surface contamination of less than 1.1 kBq/m2 around the hypocenter. The results suggested no remarkable leakage of radioactivity from the epicenter to the ground surface at least not for non-rare gas elements as of 1998.
authors.affiliation: Research Institute for Radiation Biology and Medicine, Hiroshima University, Japan. jtakada@ipc.hiroshima-u.ac.jp
authors.forename: J
authors.initials: J
authors.lastname: Takada
authors.forename: V E
authors.initials: VE
authors.lastname: Stepanov
authors.forename: D P
authors.initials: DP
authors.lastname: Yefremov
authors.forename: T
authors.initials: T
authors.lastname: Shintani
authors.forename: A
authors.initials: A
authors.lastname: Akiyama
authors.forename: M
authors.initials: M
authors.lastname: Fukuda
authors.forename: M
authors.initials: M
authors.lastname: Hoshi
mesh_terms: D004307:Dose-Response Relationship, Radiation; D009678:Nuclear Energy; D011834:Radiation Monitoring; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D014586:USSR
chemical_list: D012990:Soil Pollutants, Radioactive