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Kikuchi, Haruka; Hirano, Hiroshi*; Kitamura, Akihiro
Nihon Genshiryoku Gakkai Wabun Rombunshi, 21(1), p.50 - 63, 2022/03
The air fed suit is a kind of personal protective equipment that provides purified air through a hose and that protects a worker from radiation hazards. In the Nuclear Fuel Cycle Engineering Laboratories of the JAEA, the suit is used for size reduction and dismantlement of radioactively contaminated, in particular with plutonium, gloveboxes and equipment. Although the suit has been widely adopted in the similar activities, there still exist potential hazards due to the limiting features of the suit itself and its supplemental system. In fact, we had faced with several unexpected problems regarding such restricted aspects during the dismantling activities. To address these failure potentials, we have implemented various countermeasures and improvements to enhance the workers safety. We describe the disadvantages of the air fed suit system and positive feedbacks we have implemented.
K
Li
)NbO
synthesized by malic acid complex solution methodYoneda, Yasuhiro; Takada, Eri*; Nagai, Haruka*; Kikuchi, Takeyuki*; Morishita, Masao*; Kobune, Masafumi*
Japanese Journal of Applied Physics, 56(10S), p.10PB07_1 - 10PB07_7, 2017/10
Times Cited Count：3 Percentile：14.94(Physics, Applied)A monoclinic phase was discovered in (NaKLi)NbO solid solution ceramics grown by a malic acid complex solution method. The average and local structures of this monoclinic phase were analyzed by synchrotron X-ray measurements. The local structure can be reproduced by assuming a rhombohedral model, that is the same local structure of KNbO. The results demonstrate that the monoclinic average structure is observed as a disordered rhombohedral structure.
Yoneda, Yasuhiro; Takada, Eri*; Nagai, Haruka*; Kikuchi, Takeyuki*; Kobune, Masafumi*
no journal, ,
(Na,K)NbO has been a candidate for lead-free piezo electric material, since it shows a novel piezoelectric properties by making a mixture between (Na,K)NbO and LiNbO. (Na,K,Li)NbO lies around a morphotropic phase boundary at room temperature, and it has been reported some co-existing phases of a tetragonal and a orthorhombic structures. We re-examined the crystal structure of (Na,K,Li)NbO by using high-energy synchrotron X-ray. It was found that (Na,K,Li)NbO has a monoclinic structure at room temperature. Moreover, we found a phase transition at approximately 200 K, in which the intensity of Bragg peaks changed drastically. The novel piezoelectric response of (Na,K,Li)NbO is caused by modifying the phase transition below room temperature.
Kikuchi, Haruka
no journal, ,
no abstracts in English
