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247 results on '"TSUKADA, Hirofumi"'

20. Repeatability and reproducibility of measurements of low dissolved radiocesium concentrations in freshwater using different pre-concentration methods

Author

Kurihara, Momo, Yasutaka, Tetsuo, Aono, Tatsuo, Ashikawa, Nobuo, Ebina, Hiroyuki, Iijima, Takeshi, Ishimaru, Kei, Kanai, Ramon, Karube, Zin’ichi, Konnai, Yae, Kubota, Tomijiro, Maehara, Yuji, Maeyama, Takeshi, Okizawa, Yusuke, Ota, Hiroaki, Otosaka, Shigeyoshi, Sakaguchi, Aya, Tagomori, Hisaya, Taniguchi, Keisuke, Tomita, Masatoshi, Tsukada, Hirofumi, Hayashi, Seiji, Lee, Sangyoon, Miyazu, Susumu, Shin, Moono, Nakanishi, Takahiro, Nishikiori, Tatsuhiro, Onda, Yuichi, Shinano, Takuro, and Tsuji, Hideki

Published
2019
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31. Addressing ecological effects of radiation on populations and ecosystems to improve protection of the environment against radiation: Agreed statements from a Consensus Symposium

Author

Bréchignac, François, Oughton, Deborah, Mays, Claire, Barnthouse, Lawrence, Beasley, James C., Bonisoli-Alquati, Andrea, Bradshaw, Clare, Brown, Justin, Dray, Stéphane, Geras'kin, Stanislav, Glenn, Travis, Higley, Kathy, Ishida, Ken, Kapustka, Lawrence, Kautsky, Ulrik, Kuhne, Wendy, Lynch, Michael, Mappes, Tapio, Mihok, Steve, Møller, Anders P., Mothersill, Carmel, Mousseau, Timothy A., Otaki, Joji M., Pryakhin, Evgeny, Rhodes, Olin E., Jr., Salbu, Brit, Strand, Per, and Tsukada, Hirofumi

Published
2016
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44. Repeatability and reproducibility of measurements of low dissolved radiocesium concentrations in freshwater using different pre-concentration methods

Author

SAKAGUCHI, Aya, ONDA, Yuichi, Kurihara, Momo, Yasutaka, Tetsuo, Aono, Tatsuo, Ashikawa, Nobuo, Ebina, Hiroyuki, Iijima, Takeshi, Ishimaru, Kei, Kanai, Ramon, Karube, Zin’ichi, Konnai, Yae, Kubota, Tomijiro, Maehara, Yuji, Maeyama, Takeshi, Okizawa, Yusuke, Ota, Hiroaki, Otosaka, Shigeyoshi, Tagomori, Hisaya, Taniguchi, Keisuke, Tomita, Masatoshi, Tsukada, Hirofumi, Hayashi, Seiji, Lee, Sangyoon, Miyazu, Susumu, Shin, Moono, Nakanishi, Takahiro, Nishikiori, Tatsuhiro, Shinano, Takuro, and Tsuji, Hideki

Abstract

We assessed the repeatability and reproducibility of methods for determining low dissolved radiocesium concentrations in freshwater in Fukushima. Twenty-one laboratories pre-concentrated three of 10 L samples by five different pre-concentration methods (Prussian-blue-impregnated filter cartridges, coprecipitation with ammonium phosphomolybdate, evaporation, solid-phase extraction disks, and ion-exchange resin columns), and activity of radiocesium was measured. The z-scores for all of the 137Cs results were within ± 2, indicating that the methods were a good degree of precision. The relative standard deviations (RSDs) indicating the reproducibility among different laboratories were larger than the RSDs indicating the repeatability in each separate laboratory.

Published
2019

45. Quantifying spatial distribution of 137Cs in reference site soil in Asia

Author

Tagami, Keiko, Tsukada, Hirofumi, and Uchida, Shigeo

Abstract

Fallout radiocaesium (137Cs) has been used to trace soil migration (i.e., by erosion and redistribution) and soil-to-crop transfer levels of radiocaesium in agricultural fields. For soil erosion studies, reference site settings (initial 137Cs inventory, Bq m-2) are critical. Typically, non-disturbed and flat grasslands have been selected as reference sites. However, it will be difficult to justify the 137Cs concentrations for these reference sites in the future because already almost 50 years have passed since the heaviest annual global fallout was reported and 137Cs has been redistributed in some of the selected reference sites. It would be helpful if empirically derived initial 137Cs inventory data were available for the sites for comparison. In this study, we focused on areas in Asia and northern Australia where the major source of 137Cs is global fallout. We carried out a literature survey, and a total of 83 inventory datasets of global fallout 137Cs were collated for those areas in the region extending from 72.85° E to 141.35° E and from 12.43° S to 49.19° N. These data included global fallout deposition data in Japan obtained before the Fukushima Daiichi Nuclear Power Plant accident. We found a good correlation between the logarithm of global fallout 137Cs concentrations at reference sites and latitudes (R=0.805, p

Published
2019

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