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Journal Articles

Measurement of the stochastic radial dose distribution for a 30-MeV proton beam using a wall-less tissue-equivalent proportional counter

Tsuda, Shuichi; Sato, Tatsuhiko; Ogawa, Tatsuhiko

Radiation Protection Dosimetry, 168(2), p.190 - 196, 2016/02

 Times Cited Count:2 Percentile:21.33(Environmental Sciences)

Deposit energy distribution in microscopic site in a living cell is important information for understanding of biological effects of energetic heavy ion beams. In this work, a wall-less tissue equivalent proportional counter has been used for the measurement of lineal energy (y) distributions and dose-mean of y (yD) at radial direction of 30 MeV H at TIARA, for the verification of the microdosimetric function of PHITS. The measured yf(y) summed in radial direction agree with the corresponding data from the microdosimetric calculations using the PHITS code fairly well. The yD of 30 MeV proton beam presents the smallest value at r = 0.0 and gradually increase with radial distance, while the values of heavy ions such as iron showed rapid decrease with radial distance. This experimental result demonstrates that the stochastic deposit energy distribution of high-energy protons in microscopic region is rather constant both in the core and in the penumbra region of the track structure.

JAEA Reports

Development of 2-d position-sensitive neutron detector with individual readout; Operation test and establishment of detection system by means of neutron beam

Tanaka, Hiroki; Yamagishi, Hideshi; Nakamura, Tatsuya; Soyama, Kazuhiko; Aizawa, Kazuya

JAERI-Research 2005-010, 16 Pages, 2005/04

JAERI-Research-2005-010.pdf:3.39MB

We have been developing the 2-d position-sensitive neutron detector with individual readout as next-generation-type detector system for neutron scattering experiments using intense pulsed neutron source. The detection system is designed to fulfill the specifications required for each neutron spectrometer, such as a count rate, efficiency, neutron/$$gamma$$-ray ratio, a spatial resolution and a size, by using suitable detector heads. The fundamental and imaging performances of the developed system assembled with a Multi-wire proportional counter head were evaluated using a collimated neutron beam. The system worked stably for long hours at the gas pressure of 5 atm with a mixture of 30% C$$_{2}$$H$$_{6}$$ (0.26 atm $$^{3}$$He)at gas gain of 450. The spatial resolutions were 1.4, 1.6 mm (FWHM) for a cathode- and a back strip- direction, respectively, considering a beam size. It was also confirmed that the spatial uniformity of the detection efficiency over the whole sensitive detection area was rather good, $$pm$$8 % deviation from the average with the optimum discrimination level.

Journal Articles

Neutron spectra and angular distributions of concrete-moderated neutron calibration fields at JAERI

Yoshizawa, Michio; Tanimura, Yoshihiko; Saegusa, Jun; Nemoto, Hisashi*; Yoshida, Makoto

Radiation Protection Dosimetry, 110(1-4), p.81 - 84, 2004/09

 Times Cited Count:3 Percentile:23.89(Environmental Sciences)

The facility of Radiation Standards (FRS) of JAERI has equipped with the concrete-moderated neutron calibration fields as simulated workplace neutron fields. The fields use an Am-Be (37GBq) neutron source placed in the narrow space surrounded by concrete wall and bricks to produce scattered neutrons. The neutron spectra of the fields were measured with Bonner multi-sphere spectrometer system (BMS), spherical recoil-proton proportional counters (RPCs), and a liquid scintillation counter (NE-213). The results were compared with each other, and the neutron spectra and the ambient dose equivalent rate, ${it H}$$$^{*}$$(10), were agreed well within the uncertainty. The angular distributions of neutron fluence were calculated by the MCNP-4B2 Monte Carlo code to obtain the reference personal dose equivalent rate, ${it H}$$$_{p}$$(10). The calculated results show that the scattered neutrons have a wide variety of incident angles. The reference ${it H}$$$_{p}$$(10) values considered the angular distribution were found to be 10-18% smaller than those without consideration.

Journal Articles

Novel instrument system for discriminating secondary particles in high-spatial-resolution neutron detection

Yamagishi, Hideshi; Nakamura, Tatsuya; Soyama, Kazuhiko; Masaoka, Sei; Aizawa, Kazuya

Review of Scientific Instruments, 75(7), p.2340 - 2345, 2004/07

 Times Cited Count:9 Percentile:46.53(Instruments & Instrumentation)

A new instrument system with the capability of secondary-particle discrimination (InSPaD) was studied for the development of two-dimensional neutron detectors (2D-ND) filled with helium-3 gas and with high spatial resolution. The InSPaD can discriminate between the tracks of a proton and a triton created in the nuclear reaction $$^{3}$$He(${it n}$,${it p}$)${it T}$ by simply setting the level of discriminators appropriately in each signal channel, and the system exhibits a high spatial resolution, high counting rate, low background, and stability. The simulations of the 2D-ND equipped with the InSPaD revealed spatial resolutions of 0.46 mm in full width at half maximum for a 10% mixture of C$$_{2}$$H$$_{6}$$ with helium-3 at 0.3 MPa. The results of neutron-detection experiments using a microstrip gas chamber, including the range of the secondary particles and the pulse-height distribution, agreed well with the simulated results, indicating the feasibility of the InSPaD.

Journal Articles

Analysis of time evolution of neutron intensity measured with a high-sensitive neutron collar during the JCO criticality accident

Endo, Akira; Yamaguchi, Yasuhiro; Sumita, Kenji*

Journal of Nuclear Science and Technology, 40(8), p.628 - 630, 2003/08

 Times Cited Count:4 Percentile:31.95(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Measurement and analysis of neutron flux distribution of STACY heterogeneous core by position sensitive proportional counter (Contract research)

Murazaki, Minoru; Uno, Yuichi; Miyoshi, Yoshinori

JAERI-Tech 2003-029, 107 Pages, 2003/03

JAERI-Tech-2003-029.pdf:7.04MB

We have measured neutron flux distribution around the core tank of STACY heterogeneous core by position sensitive proportional counter (PSPC) to develop the method to measure reactivity for subcritical systems. The neutron flux distribution data in the position accuracy of $$pm$$13mm have been obtained in the range of uranium concentration of 50g/L to 210g/L both in critical and in subcritical state. The prompt neutron decay constant, $$alpha$$, was evaluated from the measurement data of pulsed neutron source experiments. We also calculated distribution of neutron flux and $$^{3}$$He reaction rates at the location of PSPC by using continuous energy Monte Carlo code MCNP. The measurement data was compared with the calculation results. As results of comparison, calculated values agreed generally with measurement data of PSPC with Cd cover in the region above half of solution height, but the difference between calculated value and measurement data was large in the region below half of solution height. On the other hand, calculated value agreed well with measurement data of PSPC without Cd cover.

Journal Articles

Uniformity of beta-ray plane sources for the calibration of surface contamination monitors

Kinouchi, Nobuyuki; Oishi, Tetsuya; Yoshida, Makoto

Radioisotopes, 50(5), p.183 - 189, 2001/05

no abstracts in English

JAEA Reports

Fusion-neutron diagnostic on the microwave tokamak experiment

Ogawa, Toshihide; ; Hoshino, Katsumichi; Odajima, Kazuo; Maeda, Hikosuke

JAERI-M 94-021, 45 Pages, 1994/02

JAERI-M-94-021.pdf:1.33MB

no abstracts in English

Journal Articles

Direct measurement of gaseous activities by diffusion-in long proportional counter method

Yoshida, Makoto; *; Y.Wu*; *; Uritani, Akira*; Mori, Chizuo*

Nuclear Instruments and Methods in Physics Research A, 330, p.158 - 164, 1993/00

 Times Cited Count:9 Percentile:67.26(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Efficiencies of contamination source for flooring and some materials used in unencapsulated radioactivity handling facilities

Yoshida, Makoto; Yoshizawa, Michio; Minami, Kentaro

Radioisotopes, 39(9), p.396 - 399, 1990/09

no abstracts in English

JAEA Reports

Properties of CF$$_{4}$$ Gas in Gas Detectors for Heavy Ions

*; ;

JAERI-M 84-145, 29 Pages, 1984/08

JAERI-M-84-145.pdf:1.23MB

no abstracts in English

Journal Articles

A Fast Neutron Spectrometer with Fast Coincidence Technique in Proportional Counters

; *

Nuclear Instruments and Methods, 91(1), p.57 - 60, 1971/00

no abstracts in English

Journal Articles

Electronic Collimation with Fast Coincidence Technique in Proportional Counters

; *

Journal of Nuclear Science and Technology, 7(6), p.285 - 290, 1970/06

 Times Cited Count:5

no abstracts in English

Journal Articles

A Wide range personnel neutron dosimeter based on a proportional counter

H.J.Delafield*; W.G.Sparke*; ; W.R.Loosemore*; J.A.Dennis*

Nucleonic Instrumentation IEE Conference Publication No.47, p.223 - 228, 1968/00

no abstracts in English

14 (Records 1-14 displayed on this page)
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