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Tsujimura, Norio
Radioisotopes, 69(8), p.253 - 261, 2020/08
The Japan Coast Guard observation vessel Takuyo encountered nuclear fallout originating from a U.S. nuclear weapon test detonated at Bikini Atoll on July 12, 1958. The exposure occurred two days after the detonation when the vessel was sailing southbound, about 300 km west of the danger area set up around the test site. From a small amount of rain sampled at the beginning of a rainsquall, a gross beta radioactivity of 16 kBq/L was observed, but no total precipitation measurement was made at that time. Therefore, the total amount of gross beta activity surface deposition density was alternatively derived based on an indication of a NaI(Tl) scintillation detector placed 0.3-m above the after deck of the Takuyo. By combining the maximum measured dose rate of 3.1 
Sv/h aboard with the results of Monte Carlo simulations, the surface deposition density on the Takuyo was estimated to be 2 PBq/km
, about 10 times higher than the past maximum observed in Japan in 1966. The resultant effective dose to crew members was also estimated to be below 100 Sv over the entire period of the voyage.
Tsujimura, Norio
Isotope News, (768), p.38 - 39, 2020/04
no abstracts in English
Tsujimura, Norio
Hoken Butsuri (Internet), 54(4), P. 205, 2019/12
no abstracts in English
Tsujimura, Norio
Isotope News, (763), p.42 - 43, 2019/06
no abstracts in English
Tsujimura, Norio
Hoken Butsuri (Internet), 54(1), p.40 - 44, 2019/03
Rainwater containing radioactive materials originating from the USA's nuclear weapon test conducted at Bikini Atoll was observed throughout Japan in 1954. It has been reported that the maximum gross beta activity observed at that time in Kyoto was 523 pCi/mL (19,000 Bq/L). This measurement, however, focused on the gross beta activity contained in a small amount of rain sampled at the beginning of rainfall, which is different from present observations that are based on the average gross beta activity contained in rain collected during a 24-h period. As a result of reviewing and converting the 1954 data to be equivalent to current measurement, the maximum value was reduced to 50 pCi/mL (1,800 Bq/L), with a resultant surface deposition density of 310 mCi/km (11,000 MBq/km). These values are well below 1/10 of the past maximum observed a few days after China's fifth nuclear weapon test in 1966.
Tkalin, A. V.*; Lishavskaya, T. S.*; Belan, T. A.*; Karasev, E. V.*; Togawa, Orihiko
Pacific Oceanography, 1(1), p.42 - 52, 2003/08
no abstracts in English
Maruo, Yoshihiro; ; Takeishi, Minoru; ; ; Takeyasu, Masanori;
JNC TN8440 2001-011, 146 Pages, 2001/06
JNC-TN8440-2001-011.pdf:2.98MB
Environmental radiation monitoring around the Tokai Reprocessing Plant has been performed since 1975, based on "Safety Regulations for the Tokai Reprocessing Plant, Chapter IV - Environmental Monitoring". This annual report presents the results of the environmental monitoring and the dose estimation to the hypothetical inhabitants due to the radioactivity discharged from the plant during April 2000 to March 2001. Appendices present comprehensive information, such as monitoring program, monitoring results, meteorological data and annual discharges from the plant.
Shinohara, Kunihiko; ; ; ; ; Kano, Yutaka;
JNC TN8440 2001-004, 62 Pages, 2001/02
JNC-TN8440-2001-004.pdf:4.17MB
Concerming about the action for the criticality accident in JCO Co., Ltd. (JCO) occurred at 10:35 on 30
Sept. 1999, Japan Nuclear Cycle Development Institute(JNC) established "JNC's task force" at 12:35 on the same date in conjuction with Head Office and Tokai Works. And JNC's task force had supported the government of Japan, the local governments and JCO humanly, physically and technically until the jobs of the task force was transferred to "Support Assembly for Countermeasure and Research of JCO Criticality Accident" and routine line on 12 Oct. 1999. This report compiled the results of the environmental monitoring performed by JNC based on the request from the government of Japan and the local governments.
Kinase, Sakae; Kawai, Katsuo; Okada, T.*; Shiraishi, Akemi; Oi, Yoshihiro; Mizushita, Seiichi
Health Physics, 76(4), p.443 - 444, 1999/04
no abstracts in English
Matsunaga, Takeshi; Ueno, Takashi; R.Chandradjith*; Amano, Hikaru; *; *
Chemosphere, 39(2), p.269 - 283, 1999/00
Times Cited Count：13 Percentile：34.68(Environmental Sciences)no abstracts in English
Yanase, Nobuyuki; Matsunaga, Takeshi; Amano, Hikaru; Isobe, Hiroshi; Sato, Tsutomu
Proc. of 7th Int. Conf. on Radioactive Waste Management and Environmental Remediation (ICEM'99)(CD-ROM), 6 Pages, 1999/00
no abstracts in English
Ueno, Takashi; Amano, Hikaru; R.L.R.Chandrajith*; *
The Fate of Mercury in Gold Mining and Measures to Control the Evironmental Pollution in Various Con, 0(0), p.52 - 60, 1996/11
no abstracts in English
Takahashi, Tomoyuki; *; *
Kurosu Oba Kenkyu Shimpojiumu, Osen Busshitsu No Kankyo Kyodo Yosoku Ni Kansuru Kyokuchi Kibo Shosai Moderu Narabini Sono Iko Parameta, 0, p.134 - 142, 1995/00
no abstracts in English
*; Hoshi, Michio
JAERI-M 93-161, 25 Pages, 1993/09
no abstracts in English
Cs in the Kuji River, JapanMatsunaga, Takeshi; Amano, Hikaru; Yanase, Nobuyuki
Applied Geochemistry, 6(2), p.159 - 167, 1991/00
Times Cited Count：36 Percentile：65.8(Geochemistry & Geophysics)no abstracts in English
Malinauskas, A. P.*; Buchanan, J. R.*; Lorenz, R. A.*;
Mech.Eng., 109(2), p.50 - 53, 1987/02
no abstracts in English
Hoken Butsuri, 20, p.79 - 83, 1985/00
no abstracts in English
Pu in Tokai-mura,Japan; ;
Health Physics, 46(1), p.214 - 217, 1984/00
no abstracts in English
Be in the lower atmoshere and fallout rate in Tokai;
Hoken Butsuri, 16(2), p.99 - 103, 1981/00
no abstracts in English
