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Yokoyama, Sumi*; Hamada, Nobuyuki*; Tsujimura, Norio; Kunugita, Naoki*; Nishida, Kazutaka*; Ezaki, Iwao*; Kato, Masahiro*; Okubo, Hideki*
International Journal of Radiation Biology, 99(4), p.604 - 619, 2023/04
Times Cited Count：2 Percentile：19.1(Biology)In April 2011, the International Commission on Radiological Protection recommended reducing the occupational equivalent dose limit for the lens. Such a new occupational lens dose limit has thus far been implemented in many countries, and there are extensive discussions toward its regulatory implementation in other countries. In Japan, discussions in the Japan Health Physics Society (JHPS) began in April 2013 and in Radiation Council in July 2017, and the new occupational lens dose limit was implemented into regulation in April 2021. To share our experience, we have published a series of papers summarizing situations in Japan: the first paper based on information available by early 2017, and the second paper by early 2019. This paper (our third paper of this series) aims to review updated information available by mid-2022, such as regarding regulatory implementation of the new occupational lens dose limit, recent discussions by relevant ministries based on the opinion from the council, establishment process of safety and health management systems, the JHPS guidelines on lens dose monitoring and radiation safety, voluntary countermeasures of the licensees, development of lens dose calibration method, and recent studies on exposure of the lens in nuclear workers and biological effect on the lens.
Se
Lee, C. H.*; Nishida, Atsuhiro*; Hasegawa, Takumi*; Nishiate, Hirotaka*; Kunioka, Haruno*; Kawamura, Seiko; Nakamura, Mitsutaka; Nakajima, Kenji; Mizuguchi, Yoshikazu*
Applied Physics Letters, 112(2), p.023903_1 - 023903_4, 2018/01
Times Cited Count：28 Percentile：77.56(Physics, Applied)Low energy phonons in LaOBiSSe are studied using inelastic neutron scattering. Dispersionless flat phonon branches that are mainly associated with a large vibration of Bi atoms are observed at a relatively low energy of 
= 6 - 6.7 meV. The phonon energy softens upon Se doping owing to its heavier atomic mass than S atom and the expansion of lattice constant. Simultaneously, the lattice thermal conductivity lowered upon Se doping as the same manner of the phonon softening. These suggest that despite the lack of an oversized cage in LaOBiSSe, rattling motions of Bi atoms can scatter phonon like rattling in cage compounds, contributing to enhance the thermoelectric property.
Kasukabe, Yoshitaka*; Nishida, Shinsaku*; Yamamoto, Shunya; Yoshikawa, Masahito; Fujino, Yutaka*
Applied Surface Science, 254(23), p.7942 - 7946, 2008/09
Times Cited Count：8 Percentile：37.23(Chemistry, Physical)In order to clarify atomistic growth processes of TiN
films due to ion implantation, in-situ observations by using transmission electron microscope and electron energy loss spectroscope at JAEA-Takasaki have been carried out, along with composition analysis and with the characterization of the electronic structure by molecular orbital calculation. The characterization of electronic structure of Ti films before and after implantation indicates that octahedral sites of hcp-Ti with larger space have higher electron density, which leads to the invasion of implanted ions into octahedral sites, and that the hcp-fcc transformation is induced by the shear in 
010
direction on (001) plane, promoted by the forming of 
-type covalent bonds mainly consisted of hybridized orbitals due to combination of Ti3d and N2p, and by the weakening of Ti-Ti bonds.
Kasukabe, Yoshitaka*; Yamamura, Tsutomu*; Wang, J. J.*; Nishida, Shinsaku*; Yamamoto, Shunya; Yoshikawa, Masahito
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 146, 2007/02
no abstracts in English
Kanaya, Toshiji*; Takahashi, Nobuaki; Nishida, Koji*; Seto, Hideki*; Nagao, Michihiro*; Takeda, Takayoshi*
Physica B; Condensed Matter, 385-386(1), p.676 - 681, 2006/11
Times Cited Count：13 Percentile：51.98(Physics, Condensed Matter)We report neutron spin-echo measurements on three types of poly(vinyl alcohol) (PVA) gels. The first is PVA gel in a mixture of dimethyl sulfoxide (DMSO) and water with volume ratio 60/40, the second is PVA gel in an aqueous borax solution and the third is chemically cross-linked PVA gel. The observed normalized intermediate scattering functions I(Q,t)/I(Q,0) were very different among them. The I(Q,t)/I(Q,0) of the first and third gels showed a non-decaying component in addition to a decaying component, but the second one did not have the non-decaying one. This clearly indicates that the fluctuations in the first and third PVA gels consist of static and dynamic fluctuations whereas the second PVA gel does include only the dynamic fluctuations. The dynamic and static fluctuations of the PVA gels were analyzed in terms of a restricted motion in the gel network and the Zimm motion, respectively.
Bakhtiari, M.; Tamai, Hiroshi; Kawano, Yasunori; Kramer, G. J.*; Isayama, Akihiko; Nakano, Tomohide; Kamiya, Kensaku; Yoshino, Ryuji; Miura, Yukitoshi; Kusama, Yoshinori; et al.
Nuclear Fusion, 45(5), p.318 - 325, 2005/05
Times Cited Count：45 Percentile：79.15(Physics, Fluids & Plasmas)In the previous works we had shown that injecting a mixture of large amounts of hydrogen and small amounts of argon can terminate a tokamak discharge quickly with avoiding runaway electron generation. In this work we have done the same experiments but with different gases in addition to argon. In fact we compared the effect of the puffing of argon, krypton, and xenon gases with and without simultaneous hydrogen gas puffing on disruption mitigation. We observed that injecting all impurities in the form of an admixture in hydrogen lead to faster plasma shutdowns with less runaway electron generation. We also found that injecting krypton gas (with or without hydrogen) seems to be a good candidate for plasma shutdown purposes since it induces low heat flux to divertor plates and avoids runaway electron generation more effectively.
(M
,Si)
(M=Sr and Ba, M=Al and Ga), ternary silicides with the AlB-type structureImai, Motoharu*; Nishida, Kenji*; Kimura, Takashi*; Kitazawa, Hideaki*; Abe, Hideki*; Kito, Hijiri*; Yoshii, Kenji
Physica C, 382(4), p.361 - 366, 2002/11
Times Cited Count：57 Percentile：88.48(Physics, Applied)no abstracts in English
Bakhtiari, M.; Kawano, Yasunori; Tamai, Hiroshi; Miura, Yushi; Yoshino, Ryuji; Nishida, Yasushi*
Nuclear Fusion, 42(10), p.1197 - 1204, 2002/10
Times Cited Count：49 Percentile：80.52(Physics, Fluids & Plasmas)no abstracts in English
Bakhtiari, M.; Yoshino, Ryuji; Nishida, Yasushi*
Fusion Science and Technology, 41(2), p.77 - 87, 2002/03
Times Cited Count：6 Percentile：39.48(Nuclear Science & Technology)no abstracts in English
; Kato, Takashi; Tsuji, Hiroshi; *; *; Nakahira, Masataka; *; Oono, Isamu*; *; R.Bourque*; et al.
Proc. of 16th Int. Cryogenic Engineering Conf. /Int. Cryogenic Materials Conf., 0, p.427 - 430, 1996/00
no abstracts in English
*; *; *; *; *; *
PNC TJ9216 88-001, 53 Pages, 1988/09
Elevated temperature properties of SAW weldment for 9Cr-2Mo steel were studied. In this study, tensile tests, creep tests, low-cycle fatigue tests of SAW weld metal and welded joint were conducted. Creep-fatigue tests of base metal were also carried out. As a result, the following remarks were obtained. (1)Weld metal had higher creep rupture strength than that of base metal in the low stress region. In this region, test speciments of welded joint were ruptured at the base metal part, and welded joint had the same creep strengths as those of base metal. (2)Low-cycle fatigue strengths of weld metal were nearly equal with those of base metal and cyclic stress-strain curve of base metal was lower than that of weld metal. Therefore, for the welded joint, strain concentration occurred in the base metal part and test specimens fractured at this part. (3)In the case of creep-fatigue tests of strain hold at tension side for base metal, life reduction was not observed. However, in the case of compression hold, the life reduction ratio was remarkable in the lower strain range region.
; ; ; *; *;
Journal of Nuclear Materials, 155-157, p.861 - 865, 1988/00
Times Cited Count：4 Percentile：46.77(Materials Science, Multidisciplinary)no abstracts in English
; ; ; ; ; ; ; ;
JAERI-M 5557, 32 Pages, 1974/02
no abstracts in English
;
Journal of Nuclear Science and Technology, 5(9), p.472 - 475, 1968/00
Times Cited Count：0no abstracts in English
Takahashi, Nobuaki; Kanaya, Toshiji*; Nishida, Koji*; Seto, Hideki*; Nagao, Michihiro*; Takeda, Takayoshi*
no journal, ,
We have extensively studied nano-scale structure and dynamics of three types of poly(vinyl alcohol) (PVA) gels by using small-angle neutron scattering (SANS) and neutron spin-echo (NSE) techniques; two physical gels and one chemical gel. The first one was a PVA gel in a mixture of deuterated dimethyl sulfoxide (DMSO-d6) and D2O with volume fraction of DMSO-d6 being 0.6, in which cross-links were made of crystallites. On the basis of NSE results, SANS intensity was divided into static and dynamic fluctuations to find that the former contribution was dominant in the present wave vector (Q) range. The latter, dynamic fluctuations were analyzed in terms of fluctuations of cross-links in the quasi-equilibrium position. The second gel was PVA in aqueous borax solution. The intermediate scattering functions of the gel as well as the sol were well described by Zimm mode and gel mode in Q regions of above and below a critical wave vector (Qc). The last one was the chemically cross-linked PVA gel. The intermediate scattering function was also described by Zimm mode in a short-time region, suggesting that it behaves like polymer solution. However, in a long-time region, the data points deviated from Zimm-scaled master curve, suggesting that it was restricted by the cross-links made of covalent bonds.
Kasukabe, Yoshitaka*; Yamamura, Tsutomu*; Wang, J. J.*; Nishida, Shinsaku*; Yamamoto, Shunya; Yoshikawa, Masahito
no journal, ,
no abstracts in English
