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JAEA Reports

Analysis of the radioactivity concentrations in low-level radioactive waste generated from JPDR and JRR-4

Aono, Ryuji; Mitsukai, Akina; Haraga, Tomoko; Ishimori, Kenichiro; Kameo, Yutaka

JAEA-Data/Code 2020-006, 70 Pages, 2020/08

JAEA-Data-Code-2020-006.pdf:2.59MB

Radioactive wastes which generated from research and testing reactors in Japan Atomic Energy Agency are planning to be buried at the near surface disposal field. Therefore, it is required to establish the method to evaluate the radioactivity concentrations of radioactive wastes by the time it starts disposal. In order to contribute to this work, we collected and analyzed the samples generated from JPDR and JRR-4. In this report, we summarized the radioactivity concentrations of 19 radionuclides ( $^{3}$ H, $^{14}$ C, $^{36}$ Cl, $^{60}$ Co, $^{63}$ Ni, $^{90}$ Sr, $^{94}$ Nb, $^{99}$ Tc, $^{rm 108m}$ Ag, $^{129}$ I, $^{137}$ Cs, $^{152}$ Eu, $^{154}$ Eu, $^{234}$ U, $^{238}$ U, $^{238}$ Pu, $^{239+240}$ Pu, $^{241}$ Am, $^{244}$ Cm) which were obtained from radiochemical analysis of those samples.

Journal Articles

Phase behavior and Li $^{+}$ ion conductivity of styrene-ethylene oxide multiblock copolymer electrolytes

Sarapas, J. M.*; Saijo, Kenji*; Zhao, Y.; Takenaka, Mikihito*; Tew, G. N.*

Polymers for Advanced Technologies, 27(7), p.946 - 954, 2016/07

https://doi.org/10.1002/pat.3753

Times Cited Count：10 Percentile：36.08(Polymer Science)

Journal Articles

Application of turbidity measurement for evaluation of two-phase separation in ,-dialkylamides-nitric acid systems

Tsutsui, Nao; Ban, Yasutoshi; Hakamatsuka, Yasuyuki; Urabe, Shunichi; Matsumura, Tatsuro

Proceedings of 21st International Conference & Exhibition; Nuclear Fuel Cycle for a Low-Carbon Future (GLOBAL 2015) (USB Flash Drive), p.1153 - 1157, 2015/09

,-Dialkylamides are promising alternative extractants to tri--butyl phosphate in the reprocessing of spent nuclear fuels, but the two-phase separation between their organic and aqueous phases has not been evaluated quantitatively. ,-Di(2-ethylhexyl)-2,2-dimethylpropanamide (DEHDMPA) in -dodecane were agitated with uranyl nitrate-containing nitric acid, and their turbidities and their uranium distribution ratios were measured with respect to the time for the quantitative evaluation. Increasing DEHDMPA, uranium, and nitric acid concentrations enhanced turbidities. Although turbidities decreased with respect to the time, uranium distribution ratios slightly changed, indicating the observed turbidities did not affect these uranium distribution ratios significantly. Therefore, DEHDMPA may act as suitable extractant for uranium in nitric acid from two-phase separation viewpoint, and turbidity may be an indicator for extractant performance evaluation.

Journal Articles

Laser induced phase separation in the nickel-fullerene nano-composite

Vacik, J.*; Naramoto, Hiroshi; Kitazawa, Shinichi; Yamamoto, Shunya; Juha, L.*

Journal of Physics and Chemistry of Solids, 66(2-4), p.581 - 584, 2005/02

https://doi.org/10.1016/j.jpcs.2004.06.035

Times Cited Count：6 Percentile：30.12(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Defect-induced phase separation in relaxor Pb(In $_{1/2}$ Nb $_{1/2}$ )O crystals

Yoneda, Yasuhiro; Matsumoto, Norimasa; Terauchi, Hikaru*; Yasuda, Naohiko*

Journal of Physics; Condensed Matter, 15(3), p.467 - 474, 2003/01

https://doi.org/10.1088/0953-8984/15/3/311

Times Cited Count：6 Percentile：35.62(Physics, Condensed Matter)

Thermal properties of ordered and disordered Pb(In $_{1/2}$ Nb $_{1/2}$ )O (PIN) single clystals were investigated. The defect-induced phase separation provided a good agreement of the instability of the relaxor nd antiferroelectric states of the PIN crystals.

Journal Articles