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作者:Hisao Nagai , Hiroyuki Matsuzaki
来源:[J].Nuclear Inst. and Methods in Physics Research, B(IF 1.266), 2019, Vol.455, pp.265-270
摘要:Abstract(#br)Atmospheric concentrations of 7 Be and 10 Be were investigated in Dazaifu, Fukuoka (1998–2001) and Tokyo (2002–2014) from 1998 to 2014. The seasonal variations were roughly the same for each year, with high 7 Be and 10 Be concentrations and high 10 Be/ 7 Be isot...
作者:Hisao Nagai , Takeyasu Yamagata ...
来源:[J].Journal of Environmental Radioactivity(IF 2.119), 2019, Vol.198, pp.79-88
摘要:Abstract(#br)We measured activity concentrations of radiocesium ( 134 Cs and 137 Cs) in seawater samples collected in North Pacific coastal and offshore areas of Japan within several months after the Fukushima Dai-ichi Nuclear Power Plant (FNPP1) accident in March 2011, incl...
作者:... Hiroyuki Matsuzaki , Hisao Nagai , Keisuke Sueki
来源:[J].Applied Geochemistry(IF 1.708), 2017, Vol.85, pp.169-179
摘要:Abstract(#br)The long-term environmental mobility of anthropogenic 129 I (physical half-life: 1.57 × 10 7 y) is of increasing concern from the view point of a low-level radiation risk assessment. A large amount of 129 I and 137 Cs (physical half-life: 30.1 y) were introduced...
作者:... Yuji Maejima , Takeyasu Yamagata , Hisao Nagai
来源:[J].Journal of Environmental Radioactivity(IF 2.119), 2015, Vol.146, pp.35-43
摘要:Abstract(#br)The 129 I derived from the FDNPP accident were clearly identified near the surface and showed a trend of rapid decrease with depth. The FDNPP 129 I and 137 Cs was 51.6 ± 1.7 mBq cm −2 and 88.2 ± 27.1 kBq cm −2 (average of four cores inventory) respectively....
作者:... Zin'ichi Karube , Hisao Nagai , Masatoshi Yamada
来源:[J].Talanta(IF 3.498), 2016, Vol.152, pp.219-227
摘要:Abstract(#br)It is important for public safety to monitor strontium-90 in aquatic environments in the vicinity of nuclear related facilities. Strontium-90 concentrations in seawater exceeding the background level have been observed in accidents of nuclear facilities. However...
作者:Hisao Nagai , Wataru Tada , Takayuki Kobayashi
来源:[J].Nuclear Inst. and Methods in Physics Research, B(IF 1.266), 2000, Vol.172 (1), pp.796-801
摘要:Abstract(#br)We have estimated the production rates of cosmogenic 7 Be and 10 Be in the stratosphere and troposphere using the neutron and proton cross-sections for 14 N and 16 O. The global average production rates (atoms cm −2 s −1 ) are 0.041 ( 7 Be) and 0.018 ( 10 Be) in...
作者:Hisao Nagai , Muneto Inayoshi ...
来源:[J].Applied Surface Science(IF 2.112), 2001, Vol.183 (3), pp.284-289
摘要:Abstract(#br)To clarify the ablation mechanism of polytetrafluoroethylene (PTFE) by synchrotron radiation (SR), the effect of the photon energy distribution of an SR beam on the ablation rate was examined. Carbon (C) and a carbon/magnesium fluoride/carbon (C/MgF x /C) membranes w...
作者:Hisao Nagai , Wataru Tada ...
来源:[J].Nuclear Inst. and Methods in Physics Research, B(IF 1.266), 2004, Vol.223-224, pp.237-241
摘要:Abstract(#br)Measurement of 7 Be by AMS was developed with the MALT 5UD Pelletron at the University of Tokyo. 7 Be 16 O − and 9 Be 16 O − negative ions were injected sequentially to the accelerator at a terminal voltage of 4.8 MV, and after passing through a high-energy anal...
作者:Takayuki Kobayashi , Hisao Nagai , Koichi Kobayashi
来源:[J].Nuclear Inst. and Methods in Physics Research, B(IF 1.266), 2000, Vol.172 (1), pp.579-582
摘要:Abstract(#br)In order to estimate their growth rates, high-resolution 10 Be profiles of three manganese crusts have been measured using accelerator mass spectrometry. One crust from the Pacific Ocean (D96-m4) displays a constant growth rate from its upper to its lower surfac...
作者:... Takeyasu Yamagata , Hajime Obata , Hisao Nagai
来源:[J].Analytica Chimica Acta(IF 4.387), 2014, Vol.852, pp.74-81
摘要:Abstract(#br)A robust and rapid method for the determination of natural levels of beryllium (Be) in seawater was developed to facilitate mapping Be concentrations in the ocean. A solid-phase extraction method using a silica gel column was applied for preconcentration and pur...

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