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I/
I and 
C records in a modern coral from Rowley Shoals off northwestern Australia reflect the 20th-century human nuclear activities and ocean/atmosphere circulationsMitsuguchi, Takehiro; Okabe, Nobuaki*; Yokoyama, Yusuke*; Yoneda, Minoru*; Shibata, Yasuyuki*; Fujita, Natsuko; Watanabe, Takahiro; Kokubu, Yoko
Journal of Environmental Radioactivity, 235-236, p.106593_1 - 106593_10, 2021/09
Times Cited Count：5 Percentile：35.21(Environmental Sciences)For a contribution to developing the usage of iodine-129 (I) as a tracer of deep-seated fluid, I/I and C were measured for annual bands (AD 1931-1991) of a modern coral collected from Northwestern Australia; the measurements were performed using the JAEA-AMS-TONO-5MV for I/I and an AMS facility of the University of Tokyo for C. Results indicate that both I/I and C distinctly increase from 1950s. The C increase can be ascribed to atmospheric nuclear tests, while the I/I increase is due to nuclear-fuel reprocessing as well as atmospheric nuclear tests. These results are in good agreement with previous studies, indicating that the I/I measurement by JAEA-AMS-TONO-5MV has been further developed.
Nemoto, Miho*; Ebine, Noriya; Okamoto, Akiko; Hosaka, Yasuhisa*; Tsuzuki, Katsunori; Terada, Hiroaki; Hayakawa, Tsuyoshi; Togawa, Orihiko
JAEA-Technology 2021-013, 41 Pages, 2021/08
JAEA-Technology-2021-013.pdf:2.52MB
When North Korea has carried out nuclear tests, Nuclear Emergency Assistance and Training Center (NEAT) predicts atmospheric dispersion of radionuclides by using the WSPEEDI-II upon requests from Nuclear Regulation Authority (NRA) and submits the predicted results to NRA in cooperation with Nuclear Science and Engineering Center (NSEC). This is a part of the activity of NEAT supporting the Japanese Government in emergency responses. The WSPEEDI-II automatic calculation system specialized for responses to nuclear tests by North Korea was developed by NSEC and was used for responses to three nuclear tests from February 2013 to September 2017. This report describes the transfer and installation of the calculation system to NEAT, and the subsequent maintenance and operation. Future issues for responses to nuclear tests are also described in this report.
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.
Ishizaki, Shuhei; Hayakawa, Tsuyoshi; Tsuzuki, Katsunori; Terada, Hiroaki; Togawa, Orihiko
JAEA-Technology 2018-007, 43 Pages, 2018/10
JAEA-Technology-2018-007.pdf:5.67MB
When North Korea has carried out a nuclear test, by a request from Nuclear Regulation Authority (NRA), Nuclear Emergency Assistance and Training Center (NEAT) predicts atmospheric dispersion of radionuclides by WSPEEDI-II system in cooperation with Nuclear Science and Engineering Center (NSEC), and submits the predicted results to NRA as the activity to assist responses by the Japanese Government. This report explains frameworks of the Japanese Government and Japan Atomic Energy Agency (JAEA) to cope with nuclear tests by North Korea, and describes a series of activities by NEAT regarding predictions of atmospheric dispersion of radionuclides in response to the 5th and 6th nuclear tests carried out by North Korea in September 2016 and September 2017. Future plans and issues to be solved for responses to nuclear tests are also described in this report, together with an outline of a computer program system used in the predictions.
Tsujimura, Norio
Isotope News, (756), p.54 - 55, 2018/04
no abstracts in English
Miyamoto, Yutaka; Oda, Tetsuzo; Adachi, Takeo; Noguchi, Hiroshi; Nishimura, Hideo; Usuda, Shigekazu
Nukleonika, 46(4), p.123 - 126, 2001/12
no abstracts in English
Tani, Hiroshi
JAERI-Review 2001-014, 135 Pages, 2001/03
JAERI-Review-2001-014.pdf:9.43MB
no abstracts in English
Aramaki, Takafumi; Mizushima, Toshihiko; Kuji, Tomoyuki*; Povinec, P. P.*; Togawa, Orihiko
Radiocarbon, 43(2B), p.857 - 867, 2001/03
no abstracts in English
Miyamoto, Yutaka
JAERI-Review 2000-025, 49 Pages, 2000/12
JAERI-Review-2000-025.pdf:16.77MB
no abstracts in English
Adachi, Takeo
Nihon Genshiryoku Gakkai-Shi, 42(11), p.1137 - 1139, 2000/11
no abstracts in English
Hayakawa, Takehito; Oshima, Masumi; Hatsukawa, Yuichi; Katakura, Junichi; Iimura, Hideki; Matsuda, Makoto; Shinohara, Nobuo; Toh, Yosuke; Mitarai, Shiro*; Shizuma, Toshiyuki; et al.
European Physical Journal A, 9(2), p.153 - 156, 2000/10
Times Cited Count：17 Percentile：66.14(Physics, Nuclear)no abstracts in English
GdHayakawa, Takehito; Oshima, Masumi; Hatsukawa, Yuichi; Katakura, Junichi; Iimura, Hideki; Matsuda, Makoto; Mitarashi, Shiro*; Shimizu, Y.*; Otsubo, Shinichi*; Shizuma, Toshiyuki; et al.
AIP Conference Proceedings 495, p.235 - 236, 1999/12
no abstracts in English
GdHayakawa, Takehito; Oshima, Masumi; Hatsukawa, Yuichi; Katakura, Junichi; Iimura, Hideki; Matsuda, Makoto; Mitarashi, Shiro*; Shimizu, Y.*; Otsubo, Shinichi*; Shizuma, Toshiyuki; et al.
Nuclear Physics A, 657(1), p.3 - 18, 1999/00
Times Cited Count：19 Percentile：70.55(Physics, Nuclear)no abstracts in English
Miyamoto, Yutaka; Oda, Tetsuzo; Noguchi, Hiroshi; Nishimura, Hideo
Dai-19-Kai Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Nenji Taikai Hobunshu, p.129 - 133, 1998/00
no abstracts in English
*; Ishii, Tetsuro; Ogawa, Masao*;
Nuclear Instruments and Methods in Physics Research A, 363, p.591 - 597, 1995/00
Times Cited Count：8 Percentile：63.11(Instruments & Instrumentation)no abstracts in English
Nagame, Yuichiro
Dai-4-Pan Jikken Kagaku Kouza, 14; Kaku, Hoshasen, p.42 - 60, 1992/00
no abstracts in English
Yamamoto, Yoichi; Kijima, Yuichi; Oda, Tetsuzo
no journal, ,
The Japanese NDC-2 estimated the movement of virtual radioactive plume by the Atmospheric Transport Modelling (ATM) simulations with regard to the DPRK 2016 event. The simulations were done in two hypothetical cases of coincident and delayed emission of radionuclides. The NDC-2 decided which IMS radionuclide stations should be monitored based on the simulation results. As the result, no radionuclides generated from the nuclear explosion were found in any IMS data obtained from the selected radionuclide stations in January. However, xenon-133 with high activity concentration above the normal background levels was detected 5 times at the Takasaki station in the middle of February. The NDC-2 estimated the location of emission source of the Xe-133 by ATM backward tracking simulations. Some ATM simulations and the analysis results by the NDC-2 are shown in the presentation.
