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23 results on '"MIYAZU, Susumu"'

5. 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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11. 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

12. Elevated rice 137Cs concentrations near the water inlet in paddy fields after the Fukushima nuclear accident.

Author

Suzuki, Yoshimasa, Shoji, Ryosuke, Tsurumaki, Takahiro, Tamaki, Syohei, Nakashima, Kousei, Miyazu, Susumu, Yoshikawa, Natsuki, Ishii, Hideki, Nogawa, Norio, Nonaka, Masanori, Suzuki, Kazuki, and Harada, Naoki

Subjects
CESIUM isotopes, FUKUSHIMA Nuclear Accident, Fukushima, Japan, 2011, BROWN rice, RICE, NUCLEAR power plant accidents, INLETS, PADDY fields, RICE straw
Abstract

The reasons why rice 137Cs concentrations increase near the water inlet were investigated using rectangular experimental plots settled in paddy fields. The 137Cs concentrations in brown rice and rice straw were highest at 1 m from the inlet and decreased gradually with increasing distance, showing a negative correlation with soil exchangeable potassium content (Ex-K). The 137Cs concentration in brown rice was negatively and positively correlated with yield and sterility rate, respectively. These results suggest that soil Ex-K reduction and rice anomalies occurred near the water inlet and could contribute to the local elevation of 137Cs concentrations in rice. [ABSTRACT FROM AUTHOR]

Published
2022
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15. Comparison of Concentration Methods for Low-level Radiocesium in Fresh Water

Author

YASUTAKA, Tetsuo, SHIN, Moono, ONDA, Yuichi, SHINANO, Takuro, HAYASHI, Seiji, TSUKADA, Hirofumi, AONO, Tatsuo, IIJIMA, Kazuki, EGUCHI, Sadao, OHNO, Koichi, YOSHIDA, Yukihiro, KAMIHIGASHI, Hiroshi, KITAMURA, Kiyoshi, KUBOTA, Tomijiro, NOGAWA, Norio, YOSHIKAWA, Natsuki, YAMAGUCHI, Hiroaki, SUEKI, Keisuke, TSUJI, Hideki, MIYAZU, Susumu, OKADA, Yukiko, KURIHARA, Momo, TARJAN, Sandor, MATSUNAMI, Hisaya, and UCHIDA, Shigeo

Abstract

A large amount of radiocesium was released from the accident at Fukushima Daiichi Nuclear Power Plant of Tokyo Electric Power Company. The determination of dissolved and particulate radiocesium concentrations in water is important, which can be used as basic information for understanding the long-term radiocesium dynamics in the environment and the transfer of radiocesium to crops. Conventional quantitative methods include the evaporative concentration to the dryness method and the AMP method. These methods need to concentrate about 20–200 L of water due to the low concentration of the dissolved radiocesium. After the accident, several new methods, such as the Prussian blue filter cartridge method and the solid-phase disk method, have been developed and put to practical use. In this study, we carried out an accuracy evaluation test to assess five methods (i.e., the evaporative concentration to dryness method, the AMP method, the Prussian blue filter cartridge method, the solid-phase disk method, and the ion-change resin method) using 3 types of water samples containing 0.01-1.0 Bq L−1 of dissolved radiocesium. Our results showed that the z-scores of over 80 % of the measured data were within ±2 and their CVs in the range of 8-13 %, indicating good reproducibility of these methods.

Published
2017

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