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Satoh, Daiki; Iwamoto, Yosuke; Ogawa, Tatsuhiko
no journal, ,
At the nuclear interactions between protons whose kinetic energy is above several tens of MeV and materials, relatively high-energy neutrons are produced in the most-forward direction. While these neutrons are important in shielding design of proton-accelerator facilities, the reliability of particle transport simulation codes regarding the most-forward neutron production is not examined well because of the lack of experimental data. The purpose of the present research project is to acquire the systematic data of neutron-production double-differential cross sections (DDX) in the most-forward direction using the proton beams supplied at the Takasaki Ion Accelerators for Advanced Radiation Application (TIARA) and to improve the accuracy of the particle transport code system PHITS. We plan to measure the DDXs of carbon, aluminum, iron, and lead for 20, 34, 48, 63, and 78 MeV protons. In FY 2015, the DDXs have been measured for 63 MeV and 78 MeV protons. The measured data were compared with the calculation results of the evaluated nuclear data library JENDL-4.0/HE and the theoretical model INCL which are utilized in the nuclear reaction calculation of PHITS. The peaks corresponding to the Q values, energy levels inside a nucleus, and quasi-free scattering were observed in the measured neutron spectra. JENDL-4.0/HE reproduced the peaks corresponding to the Q values and energy levels, but could not reproduce the structures by quasi-free scattering. On the other hand, INCL could not reproduce any peaks because the model does not consider the energy levels inside a nucleus. We'll continue to prepare the systematic data set for the PHITS improvement.
ray irradiationMotooka, Takafumi; Yamagishi, Isao; Nagaishi, Ryuji
no journal, ,
Simulated carbonate slurry was irradiated by -rays to obtain the basic knowledge of the cause of stagnant water over the High Integrity Container. The rise in water level, air bubbles in the slurry, and supernatant were observed when the carbonate slurry with 95 g/L density was irradiated by -rays at 8.5 kGy/h. It was suggested that the cause of the rise in liquid level was regarded as the volume expansion by the gas retention in carbonate slurry.
Nishimura, Shusaku; Yasue, Kenichi; Tokuyasu, Kayoko; Tozawa, Terumasa; Horiuchi, Yasuharu; Komatsu, Tetsuya
no journal, ,
no abstracts in English
Ito, Yoshiyuki; Matsushima, Ryotatsu; Sato, Fuminori; Kojima, Junji
no journal, ,
no abstracts in English
Abe, Tomohisa; Shimazaki, Takejiro; Nakayama, Takuya; Osone, Osamu; Osugi, Takeshi; Nakazawa, Osamu; Yuri, Yosuke*; Yamada, Naoto*; Sato, Takahiro*
no journal, ,
no abstracts in English
Tanno, Takashi; Oka, Hiroshi; Yano, Yasuhide; Otsuka, Satoshi; Kaito, Takeji
no journal, ,
Fe self-ion irradiation to ODS steels was conducted at 400
C to evaluate the stability of oxide nano-dispersoids in the ODS steels and embrittlement behavior of higher Cr ODS steel under irradiation. Fe and He dual ion irradiation test at 470C was also conducted to evaluate the influence of He existence. The indentation hardness increased in early stage of the irradiation, and decreased over 150 dpa. But the hardness was higher than that as unirradiated, even if the dose reached 230 dpa. The Cr enrichment from 9Cr to 11Cr would not lead to extra irradiation hardening and/or irradiation embrittlement because the irradiation hardening behavior of 9Cr and 11Cr-ODS steels were almost same. The irradiation hardening due to Fe+He dual ions irradiation was negligible or comparatively small. Therefore it was considered that fine and dense voids formation enhanced by He existence was not significant.
irradiation for inorganic solidified samples containing simulated ALPS wastesSato, Junya; Suzuki, Shinji*; Kato, Jun; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu
no journal, ,
no abstracts in English
Sato, Junya; Suzuki, Shinji*; Kato, Jun; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu
no journal, ,
no abstracts in English
Takeuchi, Tomoaki; Tsuchiya, Kunihiko; Ishihara, Masahiro; Komanome, Hirohisa*; Miura, Kuniaki*
no journal, ,
no abstracts in English
-ray irradiationNagaishi, Ryuji; Motooka, Takafumi; Yamagishi, Isao; Inoue, Masao*; Matsumura, Taichi
no journal, ,
no abstracts in English
-ray irradiationSato, Tomonori; Kato, Chiaki; Ueno, Fumiyoshi; Osaka, Masahiko
no journal, ,
To evaluate the availability of the corrosion inhibitor under irradiation condition, the corrosion test of (CS) exposed to the diluted seawater containing corrosion inhibitor under -rays irradiation condition was performed. The sodium tungstate (Na
WO
), Mixed phosphate corrosion inhibitor (MPCI) and Molybdate-containing Mixed Phosphate-based Inhibitors (MMPI) were injected into the diluted seawater as corrosion inhibitors. The corrosion potentials (CPs) of CS under -ray irradiation were also performed. The corrosion was successfully mitigated in more than 5000 ppm of NaWO containing conditions. For MPCI and MMPI, the corrosions were successfully mitigated in all of the test cases. The CP of CS sifted to a much higher potential in the NaWO containing condition. It indicated that the passive film was formed at the surface in -ray irradiation conditions same as the non-irradiation condition. The CP of CS in the MPCI containing condition was almost same as that without inhibitors. It indicated that not only cathodic reaction but also anodic reaction was mitigated by the MPCI. The CP of CS in the MMPI containing condition was larger than that without inhibitors. It indicated that the formation of passive film by the molybdate is dominant for the mitigation of the corrosion by MMPI.
Ogawa, Tatsuhiko; Yamaki, Tetsuya*; Sato, Tatsuhiko
no journal, ,
Scintillators are used for detection of various radiation such as electrons, -rays, protons and heavy ions. Fundamentally, scintillators emit lights depending on the deposition energy, but light yield is suppressed (i.e., quenching) in case of highly ionizing radiation. In this study, light yield of scintillators was calculated based on following assumptions; scintillation is attributed to excitation of phosphor molecules by incident particles, F
rster effect by the damaged phosphor molecules is the mechanism responsible for quenching, and excitation and damage of phosphor molecules can be calculated by molecular-scale radiation transport simulation code RITRACKS. Protons from 0.1MeV to 150 MeV and electrons from 0.1 MeV to 1 MeV were directed to full-stop thick NE102 scintillator as incident particles and the light yield of scintillators was calculated. Both calculated light yields and earlier measurement data showed that the light yield by electrons is proportional to incident energy whereas the light yield by protons increases with increase in incident energy in a non-linearly. Thus the simulation in this study can accurately reproduce the light yield of scintillators in radiation detection.
-ray irradiationIshijima, Yasuhiro; Ueno, Fumiyoshi
no journal, ,
Explosion-bonded metal joint has been used at the spent nuclear fuel reprocessing plant in Japan. The metal joint is made of zirconium, tantalum and stainless steel. And the radiolytic hydrogen is known to be generated in the spent nuclear fuel solution. Also, tantalum is known to be highly susceptible to hydrogen embrittlement. Therefore, evaluating the radiolytic hydrogen absorption behavior of Tantalum in nitric acid solution (HNO
) is essential. In this study, immersion tests were conducted on tantalum in nitric acid solutions under -ray irradiation to evaluate its radiolytic hydrogen absorption behavior. Results showed that there was no hydrogen absorption of tantalum after immersion. The reason was considered that the passive film generated by immersion in nitric acid solution inhibited hydrogen absorption.
ray irradiation effects of a multi functional laser processing head for fuel debris removalMuramatsu, Toshiharu; Nakamura, Masaki; Abe, Hiroshi*
no journal, ,
no abstracts in English
Inoue, Toshihiko; Yamagata, Ichiro; Otsuka, Satoshi; Kaito, Takeji; Yamashita, Shinichiro; Ioka, Ikuo
no journal, ,
no abstracts in English
Serizawa, Hiroyuki; Kaji, Yoshiyuki; Yamamoto, Shunya*; Yasunaga, Kazushi*; Oishi, Yuji*; Yamanaka, Shinsuke*
no journal, ,
Pieces of CeO(100) thin film were heat treated at 1273 K for 2h. The films were irradiated with 130-keV He
ions from 400-keV ion implanter of TIARA. The ion doped film was heat treated at 1773 K for 2h in air. The sample for STEM analysis was prepared by FIB. It was found that many blisters are formed on the surface of the thin film. The idea of gas-driven blister growth on a metal surface was first proposed by Evans et al.. So, the blisters are considered to be formed by gas babble formed accompanied by precipitation of He just under the surface. Many gas babbles are formed in the thin film. The size of the gas bubble falls within the range 30-100 nm. The shape of the gas bubble is truncated octahedron but clearly different from that of void, which mean, the existence of He in the gas bubble effect on the shape of the gas bubble.
Kumagai, Yuta; Sugawara, Atsushi; Segawa, Yukari; Watanabe, Masayuki
no journal, ,
Nanoscale porous structure of zeolites provides attractive environment for radiation-induced reactions. Efficiency of the reactions potentially improves owing to high yields of reactive radicals inside the pores, which would lead to an application of ionizing radiation for decomposition of organic substances of concern. Hence, this study examined degradation of a chlorinated organic compound, 2-chlorophenol (2-ClPh), as a model compound in aqueous solution by the combined use of gamma irradiation and adsorption by zeolite. Degradation efficiency of 2-ClPh by irradiation was improved when a hydrophobic zeolite was used as adsorbent. On the other hand, a hydrophilic zeolite showed an insignificant effect on the degradation efficiency. The difference between these zeolites is expected to be due to different performances for adsorption of 2-ClPh. The results indicate that degradation of aqueous organics can be promoted by the use of zeolites having high performance for adsorption.
Sakai, Takuro; Iikura, Hiroshi; Matsubayashi, Masahito; Yamada, Naoto*; Sato, Takahiro*; Ishii, Yasuyuki*; Uchida, Masaya*
no journal, ,
no abstracts in English