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Journal Articles

Detection limit of electron spin resonance for Japanese deciduous tooth enamel and density separation method for enamel-dentine separation

Oka, Toshitaka; Takahashi, Atsushi*; Koarai, Kazuma; Kino, Yasushi*; Sekine, Tsutomu*; Shimizu, Yoshinaka*; Chiba, Mirei*; Suzuki, Toshihiko*; Osaka, Ken*; Sasaki, Keiichi*; et al.

Journal of Radiation Research (Internet), 63(4), p.609 - 614, 2022/07

 Times Cited Count:0 Percentile:0.01(Biology)

Electron spin resonance (ESR) dosimetry is one of the most powerful tools for radiation dose reconstruction. The detection limit of this technique using human teeth is reported to be 56 mGy or 67 mGy; however, the absorbed dose of Fukushima residents after the Fukushima Daiichi Nuclear Power Plant (FNPP) accident was estimated to be lower than this detection limit. Our aim is to assess the absorbed radiation dose of children in Fukushima Prefecture after the accident; therefore, it is important to estimate the detection limit for their teeth. The detection limit for enamel of deciduous teeth of Japanese children separated by the mechanical method is estimated to be 115.0 mGy. The density separation method can effectively separate enamel from third molars of Japanese people. As we have collected thousands of teeth from children in Fukushima, the present technique may be useful to examine their external absorbed dose after the FNPP accident.

Journal Articles

Development of dose estimation method using wild animal teeth for low dose exposure

Mitsuyasu, Yusuke*; Oka, Toshitaka; Takahashi, Atsushi*; Koarai, Kazuma; Kino, Yasushi*; Okutsu, Kenichi*; Sekine, Tsutomu*; Yamashita, Takuma*; Shimizu, Yoshinaka*; Chiba, Mirei*; et al.

KEK Proceedings 2021-2, p.91 - 96, 2021/12

We examined whether the ESR dose estimation method could be applied to wild Japanese macaque. In this work, we investigated the enamel preparation protocol and the analytical method of the ESR spectra.

Journal Articles

Rapid analysis of $$^{90}$$Sr in cattle bone and tooth samples by inductively coupled plasma mass spectrometry

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Yanagisawa, Kayo*; Terashima, Motoki; Fujiwara, Kenso; Kino, Yasushi*; Oka, Toshitaka; Takahashi, Atsushi*; Suzuki, Toshihiko*; et al.

Journal of Analytical Atomic Spectrometry, 36(8), p.1678 - 1682, 2021/08

 Times Cited Count:2 Percentile:57.42(Chemistry, Analytical)

Rapid analysis of $$^{90}$$Sr in bone and tooth samples of cattle were achieved by an inductively coupled plasma mass spectrometry (ICP-MS) coupled with mass shift and solid phase extraction techniques. Limit of detection (LOD) in the ICP-MS measurement of 0.1 g samples was lower than that of the radioactivity measurement. Analytical time of the ICP-MS method was reduced from 20 days to 11 hours, compared with the radiometric method. Therefore, the ICP-MS method can be rapid and useful procedure of $$^{90}$$Sr in small bone and tooth samples derived from terrestrial animals.

Journal Articles

Radioactivity and radionuclides in deciduous teeth formed before the Fukushima-Daiichi Nuclear Power Plant accident

Takahashi, Atsushi*; Chiba, Mirei*; Tanahara, Akira*; Aida, Jun*; Shimizu, Yoshinaka*; Suzuki, Toshihiko*; Murakami, Shinobu*; Koarai, Kazuma; Ono, Takumi*; Oka, Toshitaka; et al.

Scientific Reports (Internet), 11(1), p.10355_1 - 10355_11, 2021/05

 Times Cited Count:4 Percentile:65.73(Multidisciplinary Sciences)

Journal Articles

External exposure dose estimation by electron spin resonance technique for wild Japanese macaque captured in Fukushima Prefecture

Oka, Toshitaka; Takahashi, Atsushi*; Koarai, Kazuma; Mitsuyasu, Yusuke*; Kino, Yasushi*; Sekine, Tsutomu*; Shimizu, Yoshinaka*; Chiba, Mirei*; Suzuki, Toshihiko*; Osaka, Ken*; et al.

Radiation Measurements, 134, p.106315_1 - 106315_4, 2020/06

 Times Cited Count:2 Percentile:39.71(Nuclear Science & Technology)

The relationship between the CO$$_{2}$$ radical intensity and the absorbed dose (dose response curve) of tooth enamel of Japanese macaque was observed by electron spin resonance and the detection limit of our system was estimated to be 33.5 mGy, which is comparable to the detection limit for human molar teeth. Using the dose response curve, external exposure dose for seven wild Japanese macaques captured in Fukushima prefecture were examined. The results suggest that the external exposure dose for the wild Japanese macaques were ranged between 45 mGy to 300 mGy.

Journal Articles

Hydrothermal redistribution of rare earth elements in Toki granitic rock,central Japan

; Onuki, Toshihiko; Isobe, Hiroshi; Yanase, Nobuyuki; Sekine, Keiichi; *; *

Journal of Contaminant Hydrology, 35, p.191 - 199, 1998/00

 Times Cited Count:4 Percentile:19.14(Environmental Sciences)

no abstracts in English

Journal Articles

Distributions of uranium-series radionuclides in rock and migration rate of uranium at the Koongarra uranium deposit, Australia

Yanase, Nobuyuki; Sato, Tsutomu; ; Sekine, Keiichi

Radiochimica Acta, 82, p.319 - 325, 1998/00

no abstracts in English

Journal Articles

Change in sorption characteristics of uranium during crystallization of amorphous iron minerals

Onuki, Toshihiko; Yanase, Nobuyuki; Sekine, Keiichi; Isobe, Hiroshi; Nagano, Tetsushi; Sakamoto, Yoshiaki

Journal of Nuclear Science and Technology, 34(12), p.1153 - 1158, 1997/12

 Times Cited Count:25 Percentile:86.3(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Progress report on safety research on radioactive waste management for the period April 1995 to March 1996

Sekine, Keiichi; Muraoka, Susumu; Bamba, Tsunetaka

JAERI-Review 97-007, 61 Pages, 1997/03

JAERI-Review-97-007.pdf:2.18MB

no abstracts in English

JAEA Reports

Progress report on safety research on radioactive waste management for the period April 1993 to March 1995

Sekine, Keiichi; Muraoka, Susumu; Bamba, Tsunetaka

JAERI-Review 96-005, 97 Pages, 1996/03

JAERI-Review-96-005.pdf:2.88MB

no abstracts in English

Journal Articles

Selective extraction procedure and itsimportance in a natural analogue study; Case study at the Koongarra uranium deposit

Yanase, Nobuyuki; Sato, Tsutomu; Isobe, Hiroshi; Sekine, Keiichi

Hoshasei Haikibutsu Kenkyu, 2(1-2), p.121 - 135, 1996/02

no abstracts in English

Journal Articles

Solubility of neptunium(IV) hydrous oxide in aqueous solutions

Nakayama, Shinichi; Yamaguchi, Tetsuji; Sekine, Keiichi

Radiochimica Acta, 74(1), p.15 - 19, 1996/01

no abstracts in English

Journal Articles

Analogue studies in the Alligator Rivers region of Australia; Contribution to the scientific basis for the performance assessment of proposed repository sites

H.M.Garnett*; P.L.Airey*; Sekine, Keiichi; P.-S.Hahn*; W.R.Ott*; C.Pescatore*

10th Pacific Basin Nuclear Conf. (10-PBNC), 2, p.1335 - 1342, 1996/00

no abstracts in English

JAEA Reports

Geochemical studies for geologic disposal of high-level radioactive waste; Research activities in Department of Environmental Safety Research, Japan Atomic Energy Research Institute

; Sato, Tsutomu; Nagano, Tetsushi; Yanase, Nobuyuki; Yamaguchi, Tetsuji; Isobe, Hiroshi; Onuki, Toshihiko; Sekine, Keiichi

JAERI-Review 95-011, 94 Pages, 1995/07

JAERI-Review-95-011.pdf:4.81MB

no abstracts in English

Journal Articles

Groundwater geochemistry in the Koongarra ore deposit, Australia, II; Activity ratios and migration mechanisms of uranium series radionuclides

Yanase, Nobuyuki; T.E.Payne*; Sekine, Keiichi

Geochemical Journal, 29, p.31 - 54, 1995/00

 Times Cited Count:23 Percentile:47.99(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

Groundwater geochemistry in the Koongarra ore deposit, Australia,I; Implications for uranium migration

Yanase, Nobuyuki; T.E.Payne*; Sekine, Keiichi

Geochemical Journal, 29, p.1 - 29, 1995/00

 Times Cited Count:24 Percentile:49.39(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

Mesurement of uranium series radionuclides in rock and groundwater at the Koongarra ore deposit, Australia, by gamma spectrometry

Yanase, Nobuyuki; Sekine, Keiichi

Materials Research Society Symposium Proceedings, Vol.353, 0, p.1235 - 1242, 1995/00

no abstracts in English

Journal Articles

Detection efficiency of a total energy absorption peak for a Ge detector in water using water tank experiment

Yanase, Nobuyuki; Sekine, Keiichi

Nihon Genshiryoku Gakkai-Shi, 37(8), p.704 - 709, 1995/00

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Status of natural analogue studies; Based on the results obtained by JAERI

Sekine, Keiichi

JAERI-M 94-061, 21 Pages, 1994/03

JAERI-M-94-061.pdf:0.71MB

no abstracts in English

JAEA Reports

Progress report on safety research on radioactive waste management for the period April 1992 to March 1993

Muraoka, Susumu; ; Sekine, Keiichi

JAERI-M 94-027, 127 Pages, 1994/03

JAERI-M-94-027.pdf:3.27MB

no abstracts in English

33 (Records 1-20 displayed on this page)