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Journal Articles

Comparison of photon spectra emitted from fuel debris using different decay data libraries

Matsumura, Taichi; Okumura, Keisuke; Fujita, Manabu*

JAEA-Conf 2021-001, p.144 - 149, 2022/03

https://doi.org/10.11484/jaea-conf-2021-001

We require reliable nuclear data that can appropriately evaluate the radiation characteristics of fuel debris for the purpose such as development of new sensors, non-destructive assay technologies and optimization of radiation shielding. In the past, even if different results were obtained depending on calculation codes, it was difficult to clarify what caused the differences. To overcome it, we have developed a new reliable code to calculate radiation decay and radioactive source spectra that can accurately treat with large amounts of nuclides and all decay modes in the decay data file. As the first step, we compared the photon spectra of fuel debris by using the recent decay data files: JENDL/DDF-2015, decay sub-libraries of ENDF/B-VIII.0 and JEFF-3.3. In the presentation, we will report requests for the modifications on the decay scheme and branching ratio of decay mode for the next JENDL decay data file.

Journal Articles

Conversion factor from dosemeter reading to air kerma for nuclear worker using anthropomorphic phantom for further conversion from air kerma to organ-absorbed dose

Furuta, Hiroshige*; Tsujimura, Norio; Nishide, Akemi*; Kudo, Shinichi*; Saigusa, Shin*

Radiation Protection Dosimetry, 189(3), p.371 - 383, 2020/05

https://doi.org/10.1093/rpd/ncaa051

Times Cited Count：4 Percentile：45.45(Environmental Sciences)

Journal Articles

Neutron emission spectrum from gold excited with 16.6 MeV linearly polarized monoenergetic photons

Kirihara, Yoichi; Nakashima, Hiroshi; Sanami, Toshiya*; Namito, Yoshihito*; Itoga, Toshiro*; Miyamoto, Shuji*; Takemoto, Akinori*; Yamaguchi, Masashi*; Asano, Yoshihiro*

Journal of Nuclear Science and Technology, 57(4), p.444 - 456, 2020/04

https://doi.org/10.1080/00223131.2019.1691073

Times Cited Count：7 Percentile：61.94(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Construction of adult Japanese voxel phantoms with various body sizes and their applications to evaluation of organ doses due to external photon irradiation

Sato, Kaoru; Takahashi, Fumiaki

Hoken Butsuri, 52(4), p.247 - 258, 2017/12

https://doi.org/10.5453/jhps.52.247

Organ doses for dose assessment in radiation protection are derived from ICRP reference phantoms (Male:RCP-AM, Female:RCP-AF) with standard Caucasian physiques. In adult, Japanese are smaller than Caucasian. To study impact of differences in physiques between Caucasian and Japanese on organ doses, we previously constructed Japanese phantoms (Male:JM-103, Female:JF-103) with average adult Japanese physiques. In addition, adult Japanese physiques have also wide distribution. Thus, we newly modeled DJM (Male) and DJF (Female) with 8 physiques by changing the perimeters of JM-103 and JF-103. Organ doses due to external photon irradiation of DJM and DJF were calculated, and were compared with those of RCP-AM and RCP-AF. In ISO geometry at 0.3 MeV, it was found that doses of breast, colon, lung, stomach, gonad, urinary bladder, esophagus, liver and thyroid in DJM and DJF with physiques, which are applicable to most adult Japanese, agreed with those of RCP-AM and RCP-AF within 10%.

JAEA Reports

MVP/GMVP version 3; General purpose Monte Carlo codes for neutron and photon transport calculations based on continuous energy and multigroup methods (Translated document)

Nagaya, Yasunobu; Okumura, Keisuke; Sakurai, Takeshi; Mori, Takamasa

JAEA-Data/Code 2016-019, 450 Pages, 2017/03

JAEA-Data-Code-2016-019.pdf:4.43MB
JAEA-Data-Code-2016-019-hyperlink.zip:2.36MB

In order to realize fast and accurate Monte Carlo simulation of neutron and photon transport problems, two Monte Carlo codes MVP (continuous-energy method) and GMVP (multigroup method) have been developed at Japan Atomic Energy Agency. The codes have adopted a vectorized algorithm and have been developed for vector-type supercomputers. They also support parallel processing with a standard parallelization library MPI and thus a speed-up of Monte Carlo calculations can be achieved on general computing platforms. The first and second versions of the codes were released in 1994 and 2005, respectively. They have been extensively improved and new capabilities have been implemented. The major improvements and new capabilities are as follows: (1) perturbation calculation for effective multiplication factor, (2) exact resonant elastic scattering model, (3) calculation of reactor kinetics parameters, (4) photo-nuclear model, (5) simulation of delayed neutrons, (6) generation of group constants, etc. This report describes the physical model, geometry description method used in the codes, new capabilities and input instructions.

Journal Articles

Single-photon emitting diode in silicon carbide

Lohrmann, A.*; Iwamoto, Naoya*; Bodrog, Z.*; Castelletto, S.*; Oshima, Takeshi; Karle, T. J.*; Gali, A.*; Prawer, S.*; McCallum, J. C.*; Johnson, B. C.*

Nature Communications (Internet), 6, p.7783_1 - 7783_7, 2015/07

https://doi.org/10.1038/ncomms8783

Times Cited Count：143 Percentile：96.84(Multidisciplinary Sciences)

Journal Articles

Dielectric response of laser-excited silicon at finite electron temperature

Sato, Shunsuke*; Shinohara, Yasushi*; Otobe, Tomohito; Yabana, Kazuhiro*

Physical Review B, 90(17), p.174303_1 - 174303_8, 2014/11

https://doi.org/10.1103/PhysRevB.90.174303

Times Cited Count：39 Percentile：81.84(Materials Science, Multidisciplinary)

We calculate the dielectric response of excited crystalline silicon in electron thermal equilibrium by adiabatic time-dependent density functional theory (TDDFT) to model the response to irradiation by high-intensity laser pulses. We find that the extracted effective mass are in the range of 0.22-0.36 and lifetimes are in the range of 1-14 fs depending on the temperature.

Journal Articles

Japanese adult male voxel phantom constructed on the basis of CT images

Sato, Kaoru; Noguchi, Hiroshi; Emoto, Yutaka*; Koga, Sukehiko*; Saito, Kimiaki

Radiation Protection Dosimetry, 123(3), p.337 - 344, 2007/02

https://doi.org/10.1093/rpd/ncl101

Times Cited Count：39 Percentile：91.43(Environmental Sciences)

A Japanese adult male voxel (volume pixel) phantom (hereinafter referred to as the JM phantom) was constructed on the basis of CT images of a healthy Japanese adult male volunteer. Body characteristics of the JM phantom were compared with those of a voxelized MIRD5 type phantom and a Japanese adult male voxel phantom which was previously developed. The voxel size of the JM phantom is 0.980.981 mm $^{3}$ . The shapes of organs of the JM phantom, even for small or complicated organs, such as thyroid and stomach, are more realistically reproduced as compared with the previous Japanese voxel phantom (voxel size: 0.980.9810 mm $^{3}$ ). Photon self-absorbed fractions for brain, kidneys, spleen, pancreas, thyroid and urinary bladder wall of JM were evaluated and were compared with those of the other phantoms. In consequence, it was suggested that the mass, shape and thickness of organs are important factors for the determination of self-absorbed fractions.

JAEA Reports

Basic study on ultra high sensitive neutron dosimetry technique based on resonant laser ablation, JAERI's nuclear research promotion program, H12-035 (Contract Research)

Iguchi, Tetsuo*; Watanabe, Kenichi*; Kawarabayashi, Jun*; Uritani, Akira*; Enokida, Yoichi*; Watanabe, Kazuo

JAERI-Tech 2004-010, 62 Pages, 2004/03

JAERI-Tech-2004-010.pdf:2.6MB

no abstracts in English

Journal Articles

High-counting-rate and high-position-resolution neutron imaging detectors using short-lifetime phosphors with crossed-fiber readout

Katagiri, Masaki; Sakasai, Kaoru; Matsubayashi, Masahito; Takahashi, Hiroyuki*; Nakazawa, Masaharu*

Nuclear Instruments and Methods in Physics Research A, 513(1-2), p.374 - 378, 2003/11

https://doi.org/10.1016/j.nima.2003.08.065

Times Cited Count：3 Percentile：27.69(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Photodissociation of highly vibrationally excited NH $_{3}$ in the 5 $nu_{N-H}$ region; Initial vibrational state dipendence of N-H bond dissociation cross section

Akagi, Hiroshi; Yokoyama, Keiichi; Yokoyama, Atsushi

Journal of Chemical Physics, 118(8), p.3600 - 3611, 2003/02

https://doi.org/10.1063/1.1538238

Times Cited Count：29 Percentile：67.38(Chemistry, Physical)

no abstracts in English

JAEA Reports

Dose conversion coefficients for high-energy photons, electrons, neutrons and protons

Sakamoto, Yukio; Sato, Osamu*; Tsuda, Shuichi; Yoshizawa, Nobuaki*; Iwai, Satoshi*; Tanaka, Shunichi; Yamaguchi, Yasuhiro

JAERI 1345, 103 Pages, 2003/01

JAERI-1345.pdf:4.95MB

no abstracts in English

Journal Articles

Lattice Boltzmann simulation of the interfacial growth of the horizontal stratified two-phase flow

Ebihara, Kenichi; Watanabe, Tadashi

International Journal of Modern Physics B, 17(1-2), p.113 - 117, 2003/01

no abstracts in English

JAEA Reports

Photon and decay data libraries for ORIGEN2 code based on JENDL FP decay data file 2000

Katakura, Junichi; Yanagisawa, Hiroshi

JAERI-Data/Code 2002-021, 81 Pages, 2002/11

JAERI-Data-Code-2002-021.pdf:3.62MB

no abstracts in English

Journal Articles

Evaluation of photon shielding capability for epithermal neutron detection during reactivity-initiated power burst experiments

Yanagisawa, Hiroshi; Nakajima, Ken; Ono, Akio; Miyoshi, Yoshinori

Journal of Nuclear Science and Technology, 39(7), p.800 - 803, 2002/07

https://doi.org/10.3327/jnst.39.800

Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Basic research on proton acceleration based on lasers and plasmas, JAERI's nuclear research promotion program, H10-008 (Contract research)

Ogata, Atsushi*; Okamoto, Hiromi*; Kusano, Kanya*; Endo, Ichita*; Nishida, Yasushi*; Sakae, Takeji*; Arai, Masatoshi*; Nakanishi, Hiroshi*; Kondo, Kiminori*

JAERI-Tech 2002-007, 28 Pages, 2002/03

JAERI-Tech-2002-007.pdf:1.34MB

no abstracts in English

Journal Articles