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Ishitsuka, Etsuo; Kenzhina, I. E.*; Okumura, Keisuke; Takemoto, Noriyuki; Chikhray, Y.*
JAEA-Technology 2016-022, 35 Pages, 2016/10
JAEA-Technology-2016-022.pdf:3.73MB
As a part of study on the mechanism of tritium release to the primary coolant in research and testing reactors, the calculation methods by PHITS code is studied to evaluate the recoil tritium release rate from beryllium core components. Calculations using neutron and triton sources were compared, and it is clear that the tritium release rates in both cases show similar values. However, the calculation speed for the triton source cases is two orders faster than that for the neutron source case. It is also clear that the calculation up to history number per unit volume of 2
10
(cm
) is necessary to determine the recoil tritium release rate of two effective digits precision. Furthermore, the relationship between the beryllium shape and recoil tritium release rate using the triton sources was studied. Recoil tritium release rate showed linear relation to the surface area per volume of beryllium, and the recoil tritium release rate showed about half of the conventional equation value.
Nishitani, Takeo; Osakabe, Masaki*; Shinohara, Koji; Ishikawa, Masao
Purazuma, Kaku Yugo Gakkai-Shi, 80(10), p.860 - 869, 2004/10
no abstracts in English
Nakamura, Tatsuya; Masaoka, Sei; Yamagishi, Hideshi; Soyama, Kazuhiko; Aizawa, Kazuya
Proceedings of ICANS-XVI, Volume 1, p.441 - 446, 2003/07
Development of a Micro-Strip Gas Chamber(MSGC) in JAERI is presented. The performances we aim at are counting rate 
10
, position resolution 
1
, detection efficiency 60% at thermal neutron and good n/gamma discrimination. Our two-dimensional gas detector consists of a micro strip plate printed on a polyimide substrate and a high pressure gas chamber which has all the signal lines are directly taken out (256ch individual readout) and withstands the pressure of 10bar 
. The individual signal readout opens the way to realize high counting rate and high position resolution at the same time. We carried out range measurements of secondary particles to confirm the range measuring power of the MSGC with that read out method. The measured ranges in the gas of 3bar helium mixed with 
ethane is 3mm, 9.5mm for triton and proton, respectively. Those values are well agreed with theoretical estimation and we could show the feasibility of the precise measurement of the ranges by the MSGC.
Masaoka, Sei; Nakamura, Tatsuya; Yamagishi, Hideshi; Soyama, Kazuhiko
JAERI-Research 2003-012, 14 Pages, 2003/06
JAERI-Research-2003-012.pdf:1.58MB
A micro-strip gas chamber (MSGC) using helium-3 gas has been developing as a two-dimensional position sensitive neutron detector for neutron scattering experiments in a high-intensity proton accelerator facility. We have developed the encode board that have built-in FPGAs (Field-Programmable Gate Array). Logics of FPGAs can be freely programmed to carry out digital processing of signals from MSGC and information of the tracks of protons and tritons can be obtained by the encode board. Therefore, the position of neutron capture (more properly the centra of the track) can be calculated by a series of data handling system. As the result of the simulation of a neutron detection experiment, it has proved that the position resolution of less than 1.6 mm can be obtained by using this data handling system.
Masaki, Kei; Sugiyama, Kazuyoshi*; Tanabe, Tetsuo*; Goto, Yoshitaka*; Miyasaka, Kazutaka*; Tobita, Kenji; Miyo, Yasuhiko; Kaminaga, Atsushi; Kodama, Kozo; Arai, Takashi; et al.
Journal of Nuclear Materials, 313-316, p.514 - 518, 2003/03
Times Cited Count：55 Percentile：94.9(Materials Science, Multidisciplinary)Detailed tritium profiles on the JT-60U W-shaped divertor and first wall tiles were examined by Tritium Imaging Plate Technique (TIPT) and full combustion method. The tritium deposition image obtained by TIPT was consistent with the distribution measured by combustion method. The highest tritium concentration was 60 kBq/cm at the dome top tile. However, deposition layer was not obviously observed on the dome top tile. The tritium concentration in the inner divertor target tile was lower (2 kBq/cm) even with the thick deposition layer of 
60 
m. This tritium distribution can be explained by energetic triton particle loss due to ripple loss. According to the simulation using the OFMC code, 31% of the triton particles produced by D-D nuclear reaction is implanted deeply to the wall without fully losing the initial energy of 1 MeV.
Nakamichi, Masaru; Akutsu, Hisashi*; Yamaguchi, Katsuyoshi*; Tsuchiya, Kunihiko; Kawamura, Hiroshi; Ito, Haruhiko
JAERI-Data/Code 2002-010, 288 Pages, 2002/03
JAERI-Data-Code-2002-010.pdf:35.19MB
no abstracts in English
Nishitani, Takeo; Isobe, Mitsutaka*; G.A.Wurden*; R.E.Chrien*; Tobita, Kenji; Kusama, Yoshinori; Harano, Hideki*
Fusion Engineering and Design, 34-35, p.563 - 566, 1997/00
Times Cited Count：19 Percentile：79.94(Nuclear Science & Technology)no abstracts in English
Nishitani, Takeo; Hoek, M.; Harano, Hideki*; Isobe, Mitsutaka*; Tobita, Kenji; Kusama, Yoshinori; Wurden, G. A.*; Chrien, R. E.*
Plasma Physics and Controlled Fusion, 38(3), p.355 - 364, 1996/03
Times Cited Count：36 Percentile：73.38(Physics, Fluids & Plasmas)no abstracts in English
M.Hoek*; Nishitani, Takeo; Ikeda, Yujiro; Morioka, Atsuhiko
Review of Scientific Instruments, 66(1), p.885 - 887, 1995/01
Times Cited Count：23 Percentile：83.34(Instruments & Instrumentation)no abstracts in English
Nishitani, Takeo; M.Hoek*; Harano, Hideki*; G.A.Wurden*; R.E.Chrien*; Isobe, Mitsutaka*; Tobita, Kenji; Kusama, Yoshinori
22nd European Physical Society Conf. on Controlled Fusion and Plasma Physics,Vol. 19C,Part II, 0, p.2.061 - 2.064, 1995/00
no abstracts in English
Yamagiwa, Mitsuru
Physics of Plasmas, 1(1), p.205 - 207, 1994/01
Times Cited Count：4 Percentile：27(Physics, Fluids & Plasmas)no abstracts in English
; Tsunematsu, Toshihide; Takeda, Tatsuoki
JAERI-M 86-159, 32 Pages, 1986/11
no abstracts in English
Tsunematsu, Toshihide; *; *; Takeda, Tatsuoki
JAERI-M 84-185, 31 Pages, 1984/10
no abstracts in English
Takeda, Tatsuoki; Tsunematsu, Toshihide;
Comput.Phys.Commun., 34, p.15 - 29, 1984/00
Times Cited Count：1 Percentile：20.17(Computer Science, Interdisciplinary Applications)no abstracts in English
Takeda, Tatsuoki; Tsunematsu, Toshihide;
JAERI-M 82-097, 64 Pages, 1982/08
no abstracts in English
JAERI-M 82-093, 56 Pages, 1982/07
no abstracts in English
Takeda, Tatsuoki; Tsunematsu, Toshihide; *
JAERI-M 9096, 103 Pages, 1980/10
no abstracts in English
F produced by the O(t,n)F reaction in neutron-irradiated lithium compounds containing oxygen; Tanaka, Kichizo
Journal of Chemical Physics, 72(5), p.3049 - 3052, 1980/00
Times Cited Count：5 Percentile：26.36(Chemistry, Physical)no abstracts in English
