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Journal Articles

Evaluation of physicochemical properties of radioactive cesium in municipal solid waste incineration fly ash by particle size classification and leaching tests

Fujii, Kengo*; Ochi, Kotaro; Obuchi, Atsushi*; Koike, Yuya*

Journal of Environmental Management, 217, p.157 - 163, 2018/07

 Times Cited Count:16 Percentile:14.22(Environmental Sciences)

After the Fukushima Daiichi-Nuclear Power Plant accident, environmental recovery was a major issue because a considerable amount of municipal solid waste incineration (MSWI) fly ash was highly contaminated with radioactive cesium. In this study, MSWI fly ash was sampled in Fukushima Prefecture, and the physicochemical properties of radioactive cesium in MSWI fly ash were evaluated by particle size classification and the Japanese leaching test No. 13 (JLT-13). The results obtained from the classification of fly ash indicated that the activity concentration of radioactive cesium and the content of the coexisting matter (i.e., chloride, potassium, and sylvite) temporarily change in response to the particle size of fly ash. X-ray diffraction results indicated that water-soluble radioactive cesium exists as CsCl because of the cooling process and that insoluble cesium is bound to the inner sphere of amorphous matter.

Oral presentation

Study of the $$^{188}$$W-$$^{188}$$Re generator using PZC and synthesis of $$^{186}$$Re and $$^{188}$$Re-DMSA

Nogawa, Norio*; Hashimoto, Kazuyuki; Kurihara, Yuichi*; Koike, Yuya*; Morikawa, Naotake*; Ijiri, Kenichi*

no journal, , 

no abstracts in English

Oral presentation

Study of the $$^{188}$$W-$$^{188}$$Re generator using PZC

Kurihara, Yuichi*; Nogawa, Norio*; Hashimoto, Kazuyuki; Koike, Yuya*; Morikawa, Naotake*; Ijiri, Kenichi*

no journal, , 

no abstracts in English

Oral presentation

Synthesis of $$^{186,188}$$Re-MAG3 and $$^{186,188}$$Re-[(CO)$$_{3}$$(H$$_{2}$$O)$$_{3}$$]$$^{+}$$

Kurihara, Yuichi*; Nogawa, Norio*; Hashimoto, Kazuyuki; Koike, Yuya*; Morikawa, Naotake*; Ijiri, Kenichi*

no journal, , 

no abstracts in English

Oral presentation

Study of the $$^{188}$$W-$$^{188}$$Re generator using PZC

Kurihara, Yuichi*; Nogawa, Norio*; Hashimoto, Kazuyuki; Koike, Yuya*; Morikawa, Naotake*; Ijiri, Kenichi*

no journal, , 

no abstracts in English

Oral presentation

Report on recent activities at Young Researcher's Association and Student Association in Japan Health Physics Society

Kono, Takahiko; Ogino, Haruyuki*; Fujiwara, Keiko*; Moriya, Koichi*; Fujimichi, Yuki*; Koike, Yuya*

no journal, , 

no abstracts in English

Oral presentation

Suggestion from young researchers about internal exposure management in Fukushima Nuclear Power Plant accident

Kono, Takahiko; Ogino, Haruyuki*; Koike, Yuya*; Fujiwara, Keiko*; Shimada, Kazumasa*; Tani, Kotaro*; Fujimichi, Yuki*

no journal, , 

no abstracts in English

Oral presentation

Characterization of radiocesium in core soil collected at Kawasaki

Ichihashi, Jun*; Kasari, Mitsuki*; Ochi, Kotaro; Koike, Yuya*

no journal, , 

In this study, we sampled a core soil using a core sampler (0-30 cm) at Kawasaki. A sequential extraction procedure was used to characterize radiocesium in each layer of soil. We selected six sampling points in cosideration of the vegetation. Four soils were collected at 900 cm$$^{2}$$ range area. Core sample (0-30 cm) was devided into 5 cm layer and put in U-8 container, respectively. From measurement results, the vertival distribuition of radiocesium in core soil was 2.5 Bq kg$$^{-1}$$ (0-5 cm), 22.3 Bq kg$$^{-1}$$ (5-10 cm), 3.4 Bq kg$$^{-1}$$ (10-15 cm), 0.3 Bq kg$$^{-1}$$ (15-20 cm), 0.8 Bq kg$$^{-1}$$ (20-25 cm), 1.0 Bq kg$$^{-1}$$ (25-30 cm). It is indicated that radiocesium penetrate to deeper layer at Kawasaki.

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