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; ; ; Ishimori, Yuu
PNC TN6420 94-001, 128 Pages, 1994/02
Most of plutonium isotopes resulting from nuclear weapons tests from 1945 through 1980 accumlated in environments because or their long half-lives. This report is a summary on the environmental fallout of plutonium concentration data obtained in Japan. 
Pu levels are as follows: (1)annual deposition (in recent 5 years; 1988-1992), from 0.004 to 0.02 Bq/m
; (2)surface air (in recent 5 years; 1988-1992), less than the detectable limit; but only in Fukui prefecture, 22.9
10
mBq/m
in 1988; (3)surface soil, usually, from about 0.1 to a few Bq/kg dry; from 3.3 to 12.3 Bq/kg dry at Okuetsu in Fukui prefecture where it is a typical mountainous area on the side of the Sea of Japan; and from 10.4 to 55.5 Bq/kg dry at Nishiyama district in Nagasaki city where the atomic bomb exploded; (4)river water, from 0.0008 to 0.059 mBq/l; (5)lake sediments, from 0.43 Lo 8.0 Bq/kg dry; (6)river sediments, from less than the detectable limit to 0.27 Bq/kg dry; (7)sea water, from less than the detectable limit to 0.084 mBq/l; (8)sea sediments, from less than the detectable limit to 7.25 Bq/kg dry. 
Pu/
Pu activity ratio is about 0.04 (from 0.01 to 0.07 observed usually).
Sumiya, Shuichi; ; Shinohara, Kunihiko; ; ; Maruo, Yoshihiro;
PNC TN8410 92-022, 63 Pages, 1992/02
The environmental radioactivity research at PNC Tokai works has been intended to improve the radiation monitoring and the radiation dose assessment methods for Tokai reprocessing plant. This report summarizes the results of ten themes of research performed at Environmental Protection Section of Health and Safety Division from 1986 to 1990.
*; Yasu, Takami; Shoji, Kenji; Fukushima, Isao; *; Shibuya, Jun; ; ; Yamamoto, Masao
PNC TN8440 87-190, 35 Pages, 1987/08
no abstracts in English
; ; ; ; ; ; ; ; ; Ono, Akio; et al.
Journal of Nuclear Science and Technology, 23(1), p.53 - 72, 1986/00
Times Cited Count：9 Percentile：70(Nuclear Science & Technology)no abstracts in English
Takaoku, Yoshinobu*; Hattori, Isao*; Watanabe, Tetsuya*; Okaniwa, Takaaki*; Araya, Sadao*; Homma, Shunji*; Takano, Masato; Akai, Yoshie*; Suzuki, Yasuhiro*
no journal, ,
no abstracts in English
