Radiological states around the Kraton-4 underground nuclear explosion site in Sakha |
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Authors: | Takada J Stepanov V E Yefremov D P Shintani T Akiyama A Fukuda M Hoshi M |
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Institution: | Research Institute for Radiation Biology and Medicine, Hiroshima University, Japan. jtakada@ipc.hiroshima-u.ac.jp |
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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. |
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