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spectrometry of terrestrial gamma rays using portable germanium detectors in area of 80 km radius around the Fukushima Daiichi Nuclear Power PlantMikami, Satoshi; Tanaka, Hiroyuki*; Okuda, Naotoshi*; Sakamoto, Ryuichi*; Ochi, Kotaro; Uno, Kiichiro*; Matsuda, Norihiro; Saito, Kimiaki
Nihon Genshiryoku Gakkai Wabun Rombunshi, 20(4), p.159 - 178, 2021/12
In order to know the background radiation level where the area affected by the Fukushima Daiichi Nuclear Power Plant accident in 2011, terrestrial gamma rays had been measured by using portable germanium detectors repeatedly from 2013 through 2019, at 370 locations within 80 km radius area centered on the Fukushima Daiichi Nuclear Power Plant. Radioactive concentrations of Uranium 238, Thorium 232, Potassium 40 and kerma rates in air due to terrestrial gamma rays were obtained at those locations based on the method of ICRU report 53. Averaged concentrations of 
U, 
Th and 
K were 18.8, 22.7, 428 Bq/kg, respectively, and kerma rate in air over the area was found to be 0.0402 
Gy/h. The obtained kerma rates in air were compared to those reported in literatures. It was confirmed that the data were correlated with each other, and were agreed within the range of their uncertainty. This is because the kerma rate in air due to terrestrial gamma rays is depend on geology. The similar trend to previous findings was observed that the kerma rate in air at locations geologically classified as Mesozoic era, Granite and Rhyolite were statistically significantly higher than the others.
Konno, Chikara; Sato, Satoshi; Ota, Masayuki; Kwon, Saerom; Ochiai, Kentaro
Fusion Engineering and Design, 109-111(Part B), p.1649 - 1652, 2016/11
Times Cited Count：7 Percentile：55.03(Nuclear Science & Technology)Recently we have examined KERMA factors and DPA cross section data in the latest official ACE files of JENDL-4.0, ENDF/B-VII.1, JEFF-3.2 and FENDL-3.0 in more detail and we found out the following new problems on the KERMA factors and DPA cross section data. (1) NJOY bugs and incorrect nuclear data generated KERMA factors and DPA cross section data of no increase with decreasing neutron energy in low neutron energy. (2) Huge helium production data caused drastically large KERMA factors and DPA cross section data in low neutron energy. (3) It seemed that NJOY could not adequately process capture cross section data in File 6, not File 12-15. (4) KERMA factors with the kinematics method are not correct for nuclear data libraries without detailed secondary particle data (energy-angular distribution data). These problems should be resolved based on our study.
Tachibana, Haruo; Kikuchi, Masamitsu; Sekita, Tsutomu; Yamaguchi, Takenori; Oeda, Mikihiro*; Kurosawa, Naohiro*
JAERI-Data/Code 2004-010, 19 Pages, 2004/06
JAERI-Data-Code-2004-010.pdf:1.92MB
JAERI-Data-Code-2004-010-appendix(CD-ROM).zip:12.12MB
This report is a revised edition of "Isopleths of Surface Air Concentration and Surface Air Absorbed Dose Rate due to a Radioactive Cloud Released from a Stack(II)"(JAERI-M 90-206) and based on the revised Nuclear Safety Guidelines reflected the ICRP1990 Recommendation. Characteristics of this report are the use of Air Karma Rate (Gy/h) unit instead of Air Absorbed Dose Rate (Gy/h) unit, and the records of isopleths of surface air concentration and surface air karma rate on CD-ROM. These recorded data on CD-ROM can be printed out on paper and/or pasted on digital map by personal computer.
Fukahori, Tokio; Chiba, Satoshi; Shibata, Keiichi; Ikeda, Yujiro; Aruga, Takeo; Watanabe, Yukinobu*; Murata, Toru*; Yamano, Naoki*; Kawai, Masayoshi*
Reactor Dosimetry: Radiation Metrology and Assessment (ASTM STP 1398), p.591 - 598, 2001/00
no abstracts in English
Saito, Kimiaki; Jacob, P.*
JAERI-Data/Code 98-001, 93 Pages, 1998/02
JAERI-Data-Code-98-001.pdf:3.67MB
no abstracts in English
Ikeda, Yujiro; Maekawa, Fujio; Kasugai, Yoshimi; Uno, Yoshitomo; A.Kumar*; M.Z.Youssef*; M.A.Abdou*; Konno, Chikara; Wada, Masayuki*
Fusion Engineering and Design, 42, p.289 - 297, 1998/00
Times Cited Count：6 Percentile：49.22(Nuclear Science & Technology)no abstracts in English
Ikeda, Yujiro; A.Kumar*; Maekawa, Fujio; Wada, Masayuki*; Kasugai, Yoshimi; M.A.Abdou*
Fusion Technology 1998, 2, p.1469 - 1472, 1998/00
no abstracts in English
Ikeda, Yujiro; A.Kumar*
Proc. of 9th Int. Symp. on Reactor Dosimetry, 0, p.881 - 888, 1998/00
no abstracts in English
Iguchi, Tetsuo*; Fukahori, Tokio
JAERI-Conf 97-005, 317 Pages, 1997/03
no abstracts in English
Ikeda, Yujiro; A.Kumar*; Konno, Chikara; Kosako, Kazuaki*; Oyama, Yukio; Maekawa, Fujio; Maekawa, Hiroshi; M.Z.Youssef*; M.A.Abdou*
Fusion Technology, 28(1), p.156 - 172, 1995/08
no abstracts in English
Oyama, Yukio; ; Noda, Kenji; Maekawa, Hiroshi
KEK-Proceedings-95-1, 0, p.293 - 302, 1995/06
no abstracts in English
Sakamoto, Yukio; Tanaka, Shunichi; ; W.Pairsuwan*; Yoshizawa, Nobuaki*; *; Furihata, Shiori*; Uehara, Takashi*; Iwai, Satoshi*
JAERI-Conf 95-007, 0, p.48 - 56, 1995/03
no abstracts in English
Ikeda, Yujiro; A.Kumar*; Kosako, Kazuaki*; Konno, Chikara; Oyama, Yukio; Maekawa, Fujio; M.Z.Youssef*; M.A.Abdou*; Maekawa, Hiroshi
Fusion Engineering and Design, 28, p.769 - 775, 1995/00
no abstracts in English
Ikeda, Yujiro; Konno, Chikara; Kosako, Kazuaki*; Oyama, Yukio; Maekawa, Fujio; Maekawa, Hiroshi; A.Kumar*; M.Z.Youssef*; M.A.Abdou*
Fusion Technology, 21(3), p.2190 - 2196, 1992/05
no abstracts in English
*; *; Kosako, Kazuaki*; Seki, Yasushi
JAERI-M 91-073, 101 Pages, 1991/05
no abstracts in English
JAERI-M 91-043, 138 Pages, 1991/03
no abstracts in English
Ikezoe, Yasumasa; ; Nakajima, Hayato; ;
Journal of Nuclear Science and Technology, 23(2), p.179 - 181, 1986/00
Times Cited Count：1 Percentile：28.17(Nuclear Science & Technology)no abstracts in English
Ikezoe, Yasumasa; ; ; ; ; *; *
Journal of Nuclear Science and Technology, 21(9), p.722 - 724, 1984/00
Times Cited Count：6 Percentile：77.98(Nuclear Science & Technology)no abstracts in English
; *
JAERI-M 6348, 35 Pages, 1975/12
no abstracts in English
