Radiological states around the Kraton-4 underground nuclear explosion site in Sakha.
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.
Takada
J
J
Research Institute for Radiation Biology and Medicine, Hiroshima University, Japan. jtakada@ipc.hiroshima-u.ac.jp
Stepanov
V E
VE
Yefremov
D P
DP
Shintani
T
T
Akiyama
A
A
Fukuda
M
M
Hoshi
M
M
D004307:Dose-Response Relationship, Radiation; D009678:Nuclear Energy; D011834:Radiation Monitoring; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D014586:USSR
D012990:Soil Pollutants, Radioactive