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Tanimura, Yoshihiko; Yoshitomi, Hiroshi; Nishino, Sho; Tsuji, Tomoya; Fukami, Tomoyo; Shinozuka, Tomoki; Oishi, Kohei; Ishii, Masato; Takamiya, Kei; Onuki, Takaya; et al.
Radiation Measurements, 176, p.107196_1 - 107196_6, 2024/08
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)The ICRU has proposed to change the definitions of the operational quantities used for the area and individual monitoring for external exposure in the ICRU Report 95. As introducing the new operational quantities into the radiation monitoring may affect the dose assessment results using the present personal dosimeters, it is necessary to characterize the energy spectrum in the workplace and the energy dependency of the dosimeters to be used. In this work the photon spectra were measured using a NaI(Tl) scintillation detector or a LaBr
(Ce) scintillation detector at the workplaces in the Japanese Research Reactor No.3 (JRR-3) and the Japan Proton Accelerator Research Complex (J-PARC) at Japan Atomic Energy Agency (JAEA). Then the present and new operational quantities were evaluated using the above mention spectra at the workplaces and compared each other.
Sakaki, Hironao; Fukuda, Yuji; Nishiuchi, Mamiko; Jinno, Satoshi; Kanasaki, Masato; Yogo, Akifumi; Kondo, Kiminori; Saito, Fumihiro; Fukami, Tomoyo; Ueno, Masayuki; et al.
Progress in Nuclear Science and Technology (Internet), 4, p.182 - 185, 2014/04
The concept of a compact ion particle accelerator has become attractive in view of recent progress in laser-driven ions acceleration. In the development of many applications of laser-accelerated ions, it is necessary for securing the radiation safety to calculate the dose evaluation. The dose was measured with the radio-photoluminescent (RPL) glass dosimeter on the test beamline of at laser-driven accelerator. The Monte Carlo code, PHITS (Particle and Heavy Ion Transport code system) simulation is shown to be reasonably predictive at the test beamline for measured with the RPL glass dosimeter. We compare of the measured dose level on the laser-driven accelerator with the result of PHITS code in this report.
Sakaki, Hironao; Nishiuchi, Mamiko; Maeda, Shota; Sagisaka, Akito; Pirozhkov, A. S.; Pikuz, T.; Faenov, A.*; Ogura, Koichi; Fukami, Tomoyo; Matsukawa, Kenya*; et al.
Review of Scientific Instruments, 85(2), p.02A705_1 - 02A705_4, 2014/02
Times Cited Count：2 Percentile：10.65(Instruments & Instrumentation)High intensity laser-plasma interaction has attracted considerable interest for a number of years. The laser-plasma interaction is accompanied by generation of various charged particle beams. Results of simultaneous novel measurements of electron-induced photonuclear neutrons (photoneutron), which are a diagnostic of the laser-plasma interaction, are proposed to use for optimization of the laser-plasma ion generation. The proposed method is demonstrated by the laser irradiation with the intensity os 1
10
W/cm
on the metal foil target. The photoneutrons are measured by using NE213 liquid scintillation detectors. Heavy-ion signal is registered with the CR39 track detector simultaneously. The measured signals of the electron-induced photoneutrons are well reproduced by using the Particle and Heavy Ion Transport code System (PHITS). The results obtained provide useful approach for analyzing the various laser based ion beams.
Yamada, Katsunori; Fujii, Katsutoshi; Kanda, Hiroshi; Higashi, Daisuke; Kobayashi, Toshiaki; Nakagawa, Masahiro; Fukami, Tomoyo; Yoshida, Keisuke; Ueno, Yumi; Nakajima, Junya; et al.
JAEA-Review 2013-033, 51 Pages, 2013/12
JAEA-Review-2013-033.pdf:2.73MB
After the accident at Fukushima Dai-ichi Nuclear Power Plant, various numerical criteria relevant to radiation protection were defined. We surveyed these criteria through internet. As a result of survey, the following 13 items were identified: (1) criteria for taking stable iodine tablets, (2) criteria for the screening of surface contamination, (3) evacuation area, sheltering area, etc., (4) activity concentrations in food, drinking water, etc., (5) dose limit for radiation workers engaged in emergency work, (6) guideline levels of radioactive substances in bathing areas, (7) criteria for use of school buildings and schoolyards, (8) restriction on planting rice, (9) acceptable activity concentrations in feedstuff, (10) acceptable activity concentrations in compost, (11) criteria for export containers and ships, (12) criteria for contaminated waste, (13) standards for radiation workers engaged in decontamination work. In this report, the basis of and issues on these criteria are summarized.
, n) reaction for the laser-driven accelerationSakaki, Hironao; Fukuda, Yuji; Kanasaki, Masato; Nishiuchi, Mamiko; Jinno, Satoshi; Yogo, Akifumi; Fukami, Tomoyo; Watanabe, Yukinobu; Sato, Tatsuhiko; Niita, Koji*
no journal, ,
In current researches of laser-driven acceleration, electron energies are getting higher as the high-energy ions are generated. Therefore, when the energy of ion exceeds several-tens of MeV, it is impossible to disregard the neutron generation from the (, n) reactions. Although such a neutron becomes as a background-nose of the ion measurement, a quantitative evaluation has not carried out in the laser-driven ions acceleration experiments. We report an evaluation of those neutron properties by using measurement data in the laser-plasma interaction experiments, and it is discussed with a result of Monte Carlo simulation including the (, n) reaction processes.
Yoshitomi, Hiroshi; Tatebe, Yosuke; Kawai, Keiichi; Kowatari, Munehiko; Nidaira, Atsushi; Fukami, Tomoyo; Sawahata, Katsunori
no journal, ,
no abstracts in English
Fukami, Tomoyo; Yoshitomi, Hiroshi; Nishino, Sho; Tsuji, Tomoya; Umino, Kazushige*; Tanimura, Yoshihiko
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no abstracts in English
Yoshitomi, Hiroshi; Tsuji, Tomoya; Nishino, Sho; Fukami, Tomoyo; Tanimura, Yoshihiko
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no abstracts in English
Yoshitomi, Hiroshi; Tsuji, Tomoya; Fukami, Tomoyo; Nishino, Sho; Tanimura, Yoshihiko
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no abstracts in English
Yoshitomi, Hiroshi; Tsuji, Tomoya; Fukami, Tomoyo; Nishino, Sho; Takamine, Jun; Murayama, Takashi; Tanimura, Yoshihiko
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no abstracts in English
Yoshitomi, Hiroshi; Nishino, Sho; Tsuji, Tomoya; Fukami, Tomoyo; Takamine, Jun; Umino, Kazushige*; Murayama, Takashi; Tanimura, Yoshihiko
no journal, ,
no abstracts in English
Tanimura, Yoshihiko; Yoshitomi, Hiroshi; Nishino, Sho; Tsuji, Tomoya; Fukami, Tomoyo; Takamine, Jun
no journal, ,
no abstracts in English
Nishino, Sho; Umino, Kazushige*; Yoshitomi, Hiroshi; Fukami, Tomoyo; Tsuji, Tomoya; Tanimura, Yoshihiko
no journal, ,
In the Facility of Radiation Standards (FRS) of JAEA, mono-energetic neutron calibration fields and a high-energy -ray calibration field using a 4MV Van de Graaff accelerator has been established, for calibration or characteristic tests of radiation measuring instruments. In this presentation, usage status and details of troubles occurred in the FRS accelerator in recent years will be reported.
Sakaki, Hironao; Fukuda, Yuji; Kanasaki, Masato; Jinno, Satoshi; Yogo, Akifumi; Nishiuchi, Mamiko; Kando, Masaki; Ueno, Masayuki; Fukami, Tomoyo; Niita, Koji*
no journal, ,
The compact ion particle accelerator has become attractive in view of recent progress in laser-driven ions acceleration. In the development of the instrument, it is necessary to do the bench-mark of the amount of the different types of radiation by the simulation code for radiation shieldings. The Monte Carlo Particle and Heavy Ion Transport code (PHITS) was used for bench-mark the dose on the laser-driven cluster-target type accelerator.
Sakaki, Hironao; Fukuda, Yuji; Kanasaki, Masato; Nishiuchi, Mamiko; Jinno, Satoshi; Yogo, Akifumi; Fukami, Tomoyo; Kondo, Kiminori; Sato, Tatsuhiko; Watanabe, Yukinobu; et al.
no journal, ,
Generally, if several-tens MeV electron is dumped into some material, photons with the same energy level are created by bremsstrahlung radiation. And then neutron is generated because of the (g, n) reactions. In current researches, electron energies are getting higher as the high-energy ions are generated. Therefore, when the energy of laser driven accelerated ion exceeds several-tens of MeV, it is impossible to disregard the neutron generation from the (g, n) reactions. Although such a neutron becomes as a background-nose of the ion measurement, a quantitative evaluation has not carried out in the laser-driven ions acceleration experiments yet. We report an evaluation of those neutron properties by using measurement data in the laser-plasma interaction experiments, and it is discussed with a result of Monte Carlo simulation including the (g, n) reaction processes.
, n) reactions in the laser-driven ion acceleratorSakaki, Hironao; Fukuda, Yuji; Kanasaki, Masato; Nishiuchi, Mamiko; Jinno, Satoshi; Yogo, Akifumi; Fukami, Tomoyo; Watanabe, Yukinobu; Sato, Tatsuhiko; Niita, Koji*
no journal, ,
In current researches, electron energies are getting higher as the high-energy ions are generated. Therefore, when the energy of ion exceeds several-tens of MeV, it is impossible to disregard the neutron generation from the (, n) reactions. Although such a neutron becomes as a background-nose of the ion measurement, a quantitative evaluation has not carried out in the laser-driven ions acceleration experiments yet. We report an evaluation of those neutron properties by using measurement data in the laser-plasma interaction experiments, and it is discussed with a result of Monte Carlo simulation including the (, n) reaction processes.
