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Manabe, Sachi; Matsubara, Natsumi; Saegusa, Jun; Takeishi, Minoru
KEK Proceedings 2016-8, p.281 - 285, 2016/10
no abstracts in English
Atarashi-Andoh, Mariko; Kumakura, Yasuharu*; Amano, Hikaru; Fukui, Masami*
Fusion Science and Technology, 48(1), p.771 - 774, 2005/07
Times Cited Count：3 Percentile：24.22(Nuclear Science & Technology)Uptake of tritium by food plants is an important pathway in transferring tritium to the human body. Plants take up tritium as the form of water and a part of tritiated water (HTO) is converted to organically bound tritium (OBT). The formation of OBT in plants depends on the growth stage when the contamination occurs. Potted rice plants were exposed to deuterated water vapor, as a substitute for HTO vapor, for 4 h at 5 different times during the grain ripening period to estimate the influence of the growth stage on the formation and retention of organically bound deuterium (OBD) in rice. The plants were grown outside before and after the exposure experiments and were exposed to deuterated water vapor in a laboratory in a small chamber equipped with controllers of temperature, humidity and light intensity.The mass of OBD in grain at harvest showed the highest value when the exposure was carried out in the early stage of the ripening period. When the exposure was carried out after 26 day from the heading, the increase of OBD in the grain was a little.
Atarashi-Andoh, Mariko; Amano, Hikaru; Kakiuchi, Hideki; Ichimasa, Michiko*; Ichimasa, Yusuke*
Health Physics, 82(6), p.863 - 868, 2002/06
Times Cited Count：6 Percentile：39.54(Environmental Sciences)As a substitute of tritium, deuterium water (D2O) vapor release experiments were performed to estimate the difference of formation and subsequent retention of organically bound deuterium (OBD) in rice plants between daytime and nighttime exposure. Potted plants were exposed to deuterium water vapor in a greenhouse for 8 hours, under day and night conditions. Deuterium concentrations in free water and organic matter in rice leaves and ears were investigated until the harvest time. Data analysis was carried out using a model in which different generating processes of organic matter were considered. The calculated results agreed with the measured value.
Atarashi-Andoh, Mariko; Amano, Hikaru; Ichimasa, Michiko*; Ichimasa, Yusuke*
Fusion Science and Technology, 41(3), p.427 - 431, 2002/05
In processes of tritium transfer in the environment, conversion of HTO to OBT in plant by photosynthesis is important for both aspects of monitoring and dose estimation. Because once OBT is formed in plant, it stays in the plant for longer time than HTO, and OBT is more harmful than HTO for human body. Conversion rate of HTO in plant leaf to OBT in plant edible parts in the open air were obtained for some plants (komatsuna, radish and cherry tomato) during the chronic HT release experiment at Chalk River in 1994. At the experiment, HT gas was released to the atmosphere at the cultivated site for 12 days continuously [1]. HTO and OBT concentration in cultivated plants were measured during the experiment. For plant leaves conversion rate of HTO to OBT was about 0.2 (% h
) but it varied with their growth stage. A chamber experiment in laboratory was also carried out for comparison.
P.J.Barry*; B.M.Watkins*; Y.Belot*; P.A.Davis*; O.Edlund*; D.Galeriu*; W.Raskob*; S.Russell*; Togawa, Orihiko
Journal of Environmental Radioactivity, 42(2-3), p.191 - 207, 1999/00
Times Cited Count：19 Percentile：45.67(Environmental Sciences)no abstracts in English
Yamaguchi, Takenori; Noguchi, Hiroshi
Nihon Genshiryoku Gakkai-Shi, 39(11), p.940 - 941, 1997/00
no abstracts in English
Atarashi, Mariko; Amano, Hikaru
Eisei Kogaku Shimpojiumu Rombunshu, 0, p.181 - 185, 1995/11
no abstracts in English
Amano, Hikaru; Atarashi, Mariko; Noguchi, Hiroshi; Yokoyama, Sumi; Ichimasa, Yusuke*; Ichimasa, Michiko*
Fusion Technology, 28, p.803 - 808, 1995/10
no abstracts in English
Manabe, Sachi; Utsumi, Azusa; Matsubara, Natsumi; Saegusa, Jun; Takeishi, Minoru
no journal, ,
no abstracts in English
Manabe, Sachi; Takeishi, Minoru
no journal, ,
no abstracts in English
