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Journal Articles

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

Kurihara, Momo*; Yasutaka, Tetsuo*; Aono, Tatsuo*; Ashikawa, Nobuo*; Ebina, Hiroyuki*; Iijima, Takeshi*; Ishimaru, Kei*; Kanai, Ramon*; Karube, Jinichi*; Konnai, Yae*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 322(2), p.477 - 485, 2019/11

 Times Cited Count:2 Percentile:42.44(Chemistry, Analytical)

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 $$^{137}$$Cs results were within $$pm$$2, indicating that the methods were accurate. The relative standard deviations (RSDs) indicating the variability in the results from different laboratories were larger than the RSDs indicating the variability in the results from each separate laboratory.

Journal Articles

Development of new analytical method based on $$beta$$-$$alpha$$ coincidence method for selective measurement of $$^{214}$$Bi-$$^{214}$$Po; Application to dust filter used in radiation management

Sanada, Yukihisa; Tanabe, Yoichiro*; Iijima, Nobuo; Momose, Takumaro

Radiation Protection Dosimetry, 146(1-3), p.80 - 83, 2011/07

 Times Cited Count:1 Percentile:11.72(Environmental Sciences)

The radionuclide pair $$^{214}$$Bi and $$^{214}$$Bi which belongs to the uranium-series interferes with airborne radionuclide measurement, needed for the radiation management of a nuclear facility. Time intervals between $$^{214}$$Bi ($$alpha$$) and $$^{214}$$Po ($$beta$$) are much shorter than artificial radionuclides due to the short half-life of $$^{214}$$Po (164 $$mu$$s). Measurement of airborne radionuclides can subtract this background by the selective measurement of $$^{214}$$Bi-$$^{214}$$Po. The purpose of this study is to develop of a new analytical method (Time interval analysis: TIA) based on the beta-alpha coincidence method for selective measurement of $$^{214}$$Bi-$$^{214}$$Po. The developed method was applied to an actual dust-filter measurement.

Oral presentation

Training program of the surface contamination monitoring at the Tokai reprocessing plant

Takahata, Eiji; Iijima, Nobuo; Yamashita, Tomoyuki; Akiyama, Kiyomitsu

no journal, , 

A training program of the body surface contamination at the Tokai Reprocessing Plant is introduced. This program takes consideration with low-level measurement of alpha and beta ($$gamma$$) contamination in workplace. The training effect of this program is evaluated by actual survey tests.

Oral presentation

Radiation protection at Tokai Reprocessing Plant, JAEA

Endo, Kuniaki; Iijima, Nobuo; Yoshitsugu, Yuichi; Ito, Yasuhisa; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Radiation management under circumstances of ventilation stop at the reprocessing plant; The Effect of radon progenies on airborne monitoring

Iijima, Nobuo; Sanada, Yukihisa; Yamashita, Tomoyuki; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Radiation management under circumstances of ventilation stop at the reprocessing plant; The Effect of radon progenies on airborne monitoring

Hokama, Tomonori; Iijima, Nobuo; Sanada, Yukihisa; Yamashita, Tomoyuki; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Characteristic for high count rate of commercial $$alpha$$/$$beta$$ survey meter

Iijima, Nobuo; Sanada, Yukihisa; Sakuyama, Mitsuhiro*; Yamano, Toshiya*; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Development of smear measuring method by liquid scintillation counter

Nakamura, Keisuke; Iijima, Nobuo; Yamashita, Tomoyuki; Shiba, Kozo; Momose, Takumaro

no journal, , 

no abstracts in English

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