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Ueta, Shohei; Imai, Yoshiyuki; Watanabe, Masashi; Segawa, Tomoomi; Yan, X.
International Journal of Applied Ceramic Technology, 20(1), p.261 - 265, 2023/01
Times Cited Count：2 Percentile：26.76(Materials Science, Ceramics)Takada, Hiroshi; Haga, Katsuhiro
JPS Conference Proceedings (Internet), 28, p.081003_1 - 081003_7, 2020/02
At the Japan Proton Accelerator Research Complex (J-PARC), the pulsed spallation neutron source has been in operation with a redesigned mercury target vessel from October 2017 to July 2018, during which the operational beam power was restored to 500 kW and the operation with a 1-MW equivalent beam was demonstrated for one hour. The target vessel includes a gas-micro-bubbles injector and a 2-mm-wide narrow mercury flow channel at the front end as measures to suppress the cavitation damage. After the operating period, it was observed that the cavitation damage at the 3-mm-thick front end of the target vessel could be suppressed less than 17.5 
m.
Kinase, Sakae; Takagi, Shunji*; Noguchi, Hiroshi; Saito, Kimiaki
Radiation Protection Dosimetry, 125(1-4), p.189 - 193, 2007/07
Times Cited Count：16 Percentile：71.98(Environmental Sciences)In the Japan Atomic Energy Research Institute (JAERI), a calculation code -UCWBC code- for whole-body counter calibrations using voxel phantoms has been developed as an EGS4 Monte Carlo user code. To validate the UCWBC code for calibrating whole-body counters in JAERI, response functions and counting efficiencies of a p-type high-purity Ge semiconductor detector used for the whole-body counter were evaluated for a water-filled block-shape phantom by the UCWBC code and were measured by experiments. Furthermore, counting efficiencies of the Ge semiconductor detector for the male and female voxel phantoms developed in JAERI were evaluated in the photon energy range 60-1836 keV by the UCWBC code in order to examine the differences between the counting efficiencies for voxel phantoms. In conclusion, it was found that the response functions and counting efficiencies of the Ge semiconductor detector by the UCWBC code for the water-filled block-shape phantom are in good agreement with measured data. The UCWBC code was validated by the comparisons.
Yanagisawa, Kazuaki; Takahashi, Shoji; Narita, Osamu; Yonezawa, Minoru
IAEA-CN-123/03/P/18 (CD-ROM), 9 Pages, 2004/10
To understand a socio-economic effect of basic research in JAERI, the stimulation and promotion of social interrelations through a formation of networking was studied quantitatively. (1)Worldwide trend of MS was studied by INIS by means of top {100} keywords as input. Research activity of MS in JAERI represented by top {100} keywords is not much different from that of other nuclear advanced countries participated to INIS. (2)Emphasized basic research fields (EBRF) of MS in JAERI can be clarified by selected keywords of "ion irradiation" and "actinides", those have a strong relation to nuclear. For actinides, the growth rate of networking between JAERI and PS was of order of 3-4% per 25 years and 8% per recent 5 years. The rate of networking formation is markedly increased recently. (3)Between JAERI and the other 5 selected research bodies, only 7 out of over 110 keywords such as "neutron" and "accelerators" were overlapped. In the overlapped region the two compensated and uplifted the national standard level each other.
Kinase, Sakae; Noguchi, Hiroshi; Nakamura, Takashi*
Radiation Protection Dosimetry, 105(1-4), p.467 - 472, 2003/09
Times Cited Count：4 Percentile：31.59(Environmental Sciences)To calibrate a whole-body counter, it is necessary to find a determination method for peak efficiencies of detectors that the whole-body counter has. For the purpose, peak efficiencies of a Ge semi-conductor detector for point sources and volume sources were evaluated in the photon energy range of 60-1,836 keV by Monte Carlo simulation and experiment. It was found that the calculated peak efficiency curves as a function of energy without modeling the actual sensitive region of the detector are similar in shape to those measured. The calculated peak efficiencies of the detector that has an apparent dead layer (1mm) were also found to agree with the experimental values. Consequently, the simulation method for peak efficiencies was validated. In addition, an optimum design for a whole-body counter with Ge semi-conductor detectors was examined by simulation. This simulation enables to provide a method to determine an optimum arrangement of detectors in a whole-body counter offering a uniform response to various Cs-137 distributions in a human body.
counting using mathematical simulationKinase, Sakae
JAERI-Research 2003-011, 104 Pages, 2003/05
JAERI-Research-2003-011.pdf:5.11MB
In the present study, a calibration technique for in vivo counting application using Monte Carlo simulation was developed. The advantage of the technique is that counting efficiency can be obtained for various shapes, sizes that is very difficult to change for phantoms. The method for the determination of counting efficiency curves as a function of energy was developed using the present technique and a physiques correction equation was derived from the relationship between parameters of correction factor and counting efficiencies of the JAERI whole-body counter. The uncertainties in body burdens of Cs-137 estimated with the JAERI whole-body counter were also investigated using the Monte Carlo simulation and measurements. Furthermore, the evaluation method of the peak efficiencies of a Ge semi-conductor detector was developed by the Monte Carlo simulation for optimum arrangement of Ge semi-conductor detectors for designing a precision whole-body counter.
=3 states in Al-like ionsSafronova, U. I.*; Sataka, Masao; Albritton, J. R.*; Johnson, W. R.*; Safronova, M. S.*
Atomic Data and Nuclear Data Tables, 84(1), p.1 - 83, 2003/05
Times Cited Count：40 Percentile：87.12(Physics, Atomic, Molecular & Chemical)no abstracts in English
counting using mathematical simulation, in JapaneseKinase, Sakae
Medical Physics, 30(5), P. 994, 2003/05
A calibration technique for in vivo counting application using Monte Carlo simulation was developed. To validate the calibration technique by calculations, the response functions and counting efficiencies of a whole-body counter installed in JAERI were evaluated using the simulation and measurements. Consequently, the calculations are in good agreement with the measurements. The uncertainties in body burdens of 137Cs estimated with the whole-body counter were also investigated using the Monte Carlo simulation and measurements. It was found that the uncertainties of body burdens estimated with the whole-body counter are strongly dependent on various sources of uncertainty such as radioactivity distribution within the body and counting statistics.
Sato, Kaoru; Noguchi, Hiroshi; Saito, Kimiaki; Emoto, Yutaka*; Koga, Sukehiko*
Radiation Risk Assessment Workshop Proceedings, p.102 - 110, 2001/00
For calculating doses due to radioactivity taken in a body, Specific Absorbed Fractions (SAFs) are used. In recent years, more realistic phantoms called voxel (volume pixel) phantoms have been developed on the basis of CT or MRI images of actual persons. The voxel phantoms can accurately describe sizes, shapes and locations of organs, which would affect SAFs. We are now developing Japanese adult voxel phantoms for internal dosimetry by using CT images. Until now, CT scans for three healthy Japanese male volunteers were performed under supine or upright positions to study the effect of body size and position on SAFs. The height and weight of the middle size man is almost coincident with the averages for Japanese adult. So far the development of voxel phantom has been almost finished for the middle size man (voxel-phantom-MM). The voxel size is 0.98
0.981.0 mm
. It was found that even small size organs such as thyroid were realistically modeled. The result showed that voxel-phantom-MM had realistic structure which would enable us to calculate reliable SAFs
Yamagiwa, Mitsuru; Koga, J. K.; Sagisaka, Akito*
Journal of Physics B; Atomic, Molecular and Optical Physics, 32(12), p.2881 - 2887, 1999/00
Times Cited Count：0 Percentile：0.01(Optics)no abstracts in English
Ishigami, Tsutomu; Kobayashi, Kensuke
Journal of Nuclear Science and Technology, 35(6), p.443 - 453, 1998/06
Times Cited Count：1 Percentile：15.02(Nuclear Science & Technology)no abstracts in English
Shibamoto, Yasuteru; Yonomoto, Taisuke; Kukita, Yutaka; Tsuji, Yoshiyuki*; *
Journal of Nuclear Science and Technology, 33(9), p.703 - 711, 1996/09
Times Cited Count：2 Percentile：24.71(Nuclear Science & Technology)no abstracts in English
Iwamoto, Akira; Niita, Koji*; Maruyama, Toshiki; Maruyama, Tomoyuki*
JAERI-Conf 96-009, 133 Pages, 1996/05
no abstracts in English
Ishigami, Tsutomu
Journal of Nuclear Science and Technology, 32(7), p.691 - 701, 1995/07
Times Cited Count：2 Percentile：28.65(Nuclear Science & Technology)no abstracts in English
Kobayashi, Kensuke; Ishigami, Tsutomu; ; ; *
Journal of Nuclear Science and Technology, 32(5), p.476 - 487, 1995/05
Times Cited Count：3 Percentile：36.71(Nuclear Science & Technology)no abstracts in English
Hosono, Masakazu; Arai, Hidehiko; Aizawa, Masaki*; Shimooka, Toshio*; Shimizu, Ken*; Sugiyama, Masahi*
Mizu Shori Gijutsu, 36(5), p.11 - 17, 1995/00
no abstracts in English
Hosono, Masakazu; Arai, Hidehiko; Aizawa, Masaki*; Shimooka, Toshio*; Yamamoto, Ichiro*; Shimizu, Ken*; Sugiyama, Masahi*
JAERI-M 93-007, 35 Pages, 1993/02
no abstracts in English
; ; *; Watanabe, Hiroshi
Int. Conf. on Radiation Effects and Protection, 0, p.155 - 159, 1992/00
no abstracts in English
Saito, Kimiaki; N.Petoussi*; Zankl, M.*; R.Veit*; P.Jacob*; G.Drexler*
Journal of Nuclear Science and Technology, 28(7), p.627 - 641, 1991/07
no abstracts in English
Kume, Etsuo
JAERI-M 91-047, 83 Pages, 1991/03
no abstracts in English
