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Journal Articles

Comprehensive exposure assessments from the viewpoint of health in a unique high natural background radiation area, Mamuju, Indonesia

Nugraha, E. D.*; Hosoda, Masahiro*; Kusdiana*; Untara*; Mellawati, J.*; Nurokhim*; Tamakuma, Yuki*; Ikram, A.*; Syaifudin, M.*; Yamada, Ryohei; et al.

Scientific Reports (Internet), 11(1), p.14578_1 - 14578_16, 2021/07

 Times Cited Count:8 Percentile:95.02(Multidisciplinary Sciences)

Mamuju is one of the regions in Indonesia which retains natural conditions but has relatively high exposure to natural radiation. The goals of the present study were to characterize exposure of the entire Mamuju region as a high natural background radiation area (HNBRA) and to assess the existing exposure as a means for radiation protection of the public and the environment. A cross-sectional study method was used with cluster sampling areas by measuring all parameters that contribute to external and internal radiation exposures. It was determined that Mamuju was a unique HNBRA with the annual effective dose between 17 and 115 mSv, with an average of 32 mSv. The lifetime cumulative dose calculation suggested that Mamuju residents could receive as much as 2.2 Sv on average which is much higher than the average dose of atomic bomb survivors for which risks of cancer and non-cancer diseases are demonstrated. The study results are new scientific data allowing better understanding of health effects related to chronic low-dose-rate radiation exposure and they can be used as the main input in a future epidemiology study.

Journal Articles

Solvent extraction of platinum group metals from urban mine by diglycolamide with soft donor atoms

Sasaki, Yuji; Nakase, Masahiko*

Petorotekku, 43(11), p.782 - 787, 2020/11

As analog compounds of DGA (diglycolamide), MIDOA(methylimino-diacetamide) and TDGA(thia-diglycolammide) are used for the extractants of platinum group metals. These extractants can be extracted noble metals and oxyanions, which followed by HSAB theory. The high concentration of these metals can be also extracted by these compounds. The research of metal-complex structures gives the information on the ability and role for complex-formation, which will be useful for the development of novel extractants.

Journal Articles

Development on high-power spallation neutron sources with liquid metals

Futakawa, Masatoshi

Proceedings of 13th International Symposium on Advanced Science and Technology in Experimental Mechanics (13th ISEM'18) (USB Flash Drive), 6 Pages, 2018/10

Issues on the engineering technologies relating to high-power spallation neutron sources with liquid metals are introduced. The present status on research activities and results was reviewed.

Journal Articles

The Promising features of new nano liquid metals; Liquid sodium containing titanium nanoparticles (LSnanop)

Itami, Toshio*; Saito, Junichi; Ara, Kuniaki

Metals, 5(3), p.1212 - 1240, 2015/09

 Times Cited Count:2 Percentile:5.64(Materials Science, Multidisciplinary)

A new kind of suspension liquid was developed by dispersing Ti nanoparticles (10 nm) in liquid Na, which was then determined by TEM (transmission electron microscopy) analysis. The volume fraction was estimated to be 0.0088 from the analyzed Ti concentration (2 at.%) and the densities of Ti and Na. This suspension liquid, Liquid Sodium containing nanoparticles of titanium (LSnanop), shows, despite only a small addition of Ti nanoparticles, many striking features, namely a negative deviation of 3.9% from the ideal solution for the atomic volume, an increase of 17% in surface tension, a decrease of 11% for the reaction heat to water, and the suppression of chemical reactivity to water and oxygen. The decrease in reaction heat to water seems to be derived from the existence of excess cohesive energy of LSnanop. The excess cohesive energy was discussed based on simple theoretical analyses, with particular emphasis on the screening effect. The suppression of reactivity is discussed with the relation to the decrease of heat of reaction to water or the excess cohesive energy, surface tension, the action as a plug of Ti oxide, negative adsorption on the surface of LSnanop, and percolation.

Journal Articles

Actively convected liquid metal divertor

Shimada, Michiya; Hirooka, Yoshihiko*

Nuclear Fusion, 54(12), p.122002_1 - 122002_7, 2014/12

 Times Cited Count:31 Percentile:85.86(Physics, Fluids & Plasmas)

Tungsten is considered to be the most promising material for divertor in a fusion reactor. Tungsten divertor can withstand the heat loads of ITER, but the heat loads of DEMO divertor is a challenge. Pulsive heat loads as those associated with disruption could melt tungsten targets. The surface would not be flat after subsequent resolidification, which would significantly deteriorate its heat handling capability. Furthermore, DBTT of tungsten is rather high: $$sim$$ 400$$^{circ}$$C, which would become even higher after neutron irradiation, possibly resulting in cracks in tungsten. Our proposal is to use liquid metal for the divertor target material and actively circulate it with $$j$$ $$times$$ $$B$$ force. A simplified analysis of mhd equation in a cylindrical geometry suggests that the engineering requirement is modest. This analysis suggests that this new divertor concept merits further investigation.

Journal Articles

X-ray magnetic circular dichroism at the ${it K}$ edge of Mn$$_{3}$$GaC

Takahashi, Manabu*; Igarashi, Junichi

Physical Review B, 67(24), p.245104_1 - 245104_5, 2003/06

 Times Cited Count:23 Percentile:71.51(Materials Science, Multidisciplinary)

We theoretically investigate the origin of the X-ray magnetic circular dichroism (XMCD) spectra at the K edge of Mn and Ga in the ferromagnetic phase of Mn$$_{3}$$GaC on the basis of an ab initio calculation. Taking account of the spin-orbit interaction in the LDA scheme, we obtain the XMCD spectra in excellent agreement with the recent experiment. We have analyzed the origin of each structure, and thus elucidated the mechanism of inducing the orbital polarization in the p symmetric states. We also discuss a simple sum rule connecting the XMCD spectra with the orbital moment in the p symmetric states.

JAEA Reports

Prevention measures for avoiding unexpected drifting of marine component in recovery equipment of significant metals from sea water; Positioning and monitoring system for marine component and improvement of its positioning accuracy

Tamada, Masao; Kasai, Noboru; Seko, Noriaki; Hasegawa, Shin; Kawabata, Yukiya*; Onuma, Kenji*; Takeda, Hayato*; Katakai, Akio; Sugo, Takanobu

JAERI-Tech 2001-065, 39 Pages, 2001/11

JAERI-Tech-2001-065.pdf:5.24MB

Positioning and monitoring system for marine component in recovery equipment of significant metals from seawater by using adsorbent was designed and assembled to avoid unexpected accidents. This system which was set on float part of the marine component obtains the position data by means of GPS satellites and send them to Takasaki and Mutsu establishments through satellite communication. As characteristic test for 20 days in the real sea, 256 data were obtained every 2 hours. The wrong data was eight and the positioning accuracy was 200.7m. To improve these characteristics, two new functions were added to the present firmware. These are to raise positioning resolutions in longitude and latitude from 0.001 to 0.00001 degree and to average remaining three data of positioning after maximum and minimum data were removed from continuous five times positioning. The improved system shows no wrong datum, average positioning of 6.74m. This performance is enough to prevent marine equipment from its drifting accident.

JAEA Reports

Transportation of significant metals recovered in real sea experiment of adsorbents

Takeda, Hayato*; Onuma, Kenji*; Tamada, Masao; Kasai, Noboru; Katakai, Akio; Hasegawa, Shin; Seko, Noriaki; Kawabata, Yukiya*; Sugo, Takanobu

JAERI-Tech 2001-062, 66 Pages, 2001/10

JAERI-Tech-2001-062.pdf:5.5MB

Real sea experiment for the recovery of significant metals such as uranium and vanadium has been carried out at the offing of Mutsu establishment to evaluate the adsorption performance of adsorbent synthesized by radiation-induced graft-polymerization. After elution of uranium and vanadium from the adsorbent, their metals were adsorbed onto the conventional chelate resin. This chelate resin in a plastic column was further put in a cylindrical stainless transport container. The container was transported to the facility for separation and purification by a truck for the exclusive loading. The maximum concentration is 60 Bq/g when the uranium is adsorbed on the chelate resin. Transportation of recovered metals can be treated as general substance since these amount and concentration are out of legal control. However, the recovered metals were transported in conformity to L type transportation as a voluntary regulation. The strength analysis of the container was equal to the safety level of IP-2 type which is higher transportation grade than L type .

Journal Articles

Distribution behavior of plutonium and americium in LiCl-KCl eutectic/liquid cadmium systems

Sakamura, Yoshiharu*; Shirai, Osamu; Iwai, Takashi; Suzuki, Yasufumi

Journal of Alloys and Compounds, 321(1), p.76 - 83, 2001/05

 Times Cited Count:52 Percentile:89.02(Chemistry, Physical)

no abstracts in English

Journal Articles

Lattice relaxation process in GeV ion irradiated materials

Iwase, Akihiro

Dai-11-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu (BEAMS 2000) Hobunshu, p.123 - 126, 2000/00

no abstracts in English

Journal Articles

Structure of liquid rubidium and liquid sodium under pressure

Morimoto, Yoshiki*; Kato, Sayuri*; Toda, Naohiro*; Katayama, Yoshinori; Tsuji, Kazuhiko*; Yaoita, Kenichi*; Shimomura, Osamu

Review of High Pressure Science and Technology, 7, p.245 - 247, 1998/03

X-ray diffraction for liquid Rb and liquid Na has been measured under pressure up to 6 GPa using synchrotron radiation. Volume dependences of static structure factor $$S(Q)$$ and pair distribution function $$g(r)$$ were obtained to the volume range $$nu(=V/V_{0})$$ of 0.52 for liquid Rb and $$nu$$ of 0.73 for liquid Na to investigate the effect of the electronic change on the structure of liquid metals. With increasing pressure, the peaks of $$S(Q)$$ of both liquid Rb and liquid Na shift towards higher $$Q$$, and the heights of the first peak increase. Theses volume dependences of the structural data are compared with those for other metals under pressure and expanded fluids.

Journal Articles

Ab initio molecular dynamics for simple liquid metals based on the hypernetted-chain approximation

; Chihara, Junzo

Molecular Simulation, 16, p.31 - 46, 1996/00

 Times Cited Count:3 Percentile:13.93(Chemistry, Physical)

no abstracts in English

Journal Articles

Report on 8th International Conference on Surface Modification of Metals by Ion Beams

Naramoto, Hiroshi

Isotope News, (474), p.28 - 29, 1993/12

no abstracts in English

Journal Articles

Effect of electron-excitation on ion-irradiation damage in metals

Iwase, Akihiro; Iwata, Tadao; Nihira, Takeshi*

Nihon Butsuri Gakkai-Shi, 48(4), p.274 - 278, 1993/04

no abstracts in English

Journal Articles

Defect recovery in FCC metals irradiated with 0.5 - 126 MeV energetic ions

Iwase, Akihiro; Iwata, Tadao; Nihira, Takeshi*; Sasaki, Shigemi

Mater. Sci. Forum, 97-99, p.605 - 614, 1992/00

no abstracts in English

Journal Articles

Defect recovery and radiation annealing in FCC metals irradiated with high energy ions

Iwase, Akihiro; Iwata, Tadao; Nihira, Takeshi*; Sasaki, Shigemi

Radiat. Eff. Defects Solids, 124(1), p.117 - 126, 1992/00

no abstracts in English

Journal Articles

Damage production and annealing in ion-irradiated FCC metals

Iwata, Tadao; Iwase, Akihiro

Radiation Effects and Defects in Solids,Vol. 113, p.133 - 154, 1990/00

no abstracts in English

JAEA Reports

Effect of electron-excitation on radiation damage in ion-irradiated FCC metals

Iwase, Akihiro

JAERI-M 89-071, 86 Pages, 1989/06

JAERI-M-89-071.pdf:2.13MB

no abstracts in English

JAEA Reports

Computer Simulations of Knock-on Processes in Crystals

*; ;

JAERI-M 87-026, 25 Pages, 1987/02

JAERI-M-87-026.pdf:0.67MB

no abstracts in English

41 (Records 1-20 displayed on this page)