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A Position-sensitive tubular scintillator-based detector as an alternative to a $$^{3}$$He-gas-based detector for neutron-scattering instruments

中村 龍也; 片桐 政樹*; 藤 健太郎; 本田 克徳; 鈴木 浩幸; 海老根 守澄; 美留町 厚; 坂佐井 馨; 曽山 和彦

Nuclear Instruments and Methods in Physics Research A, 741, p.42 - 46, 2014/03

 被引用回数:6 パーセンタイル:50.39(Instruments & Instrumentation)



A Scintillator-based detector with sub-100-$$mu$$m spatial resolution comprising a fibre-optic taper with wavelength-shifting fibre readout for time-of-flight neutron imaging

中村 龍也; 藤 健太郎; 川崎 卓郎; 本田 克徳; 鈴木 浩幸; 海老根 守澄; 美留町 厚; 坂佐井 馨; 曽山 和彦; 片桐 政樹*

Nuclear Instruments and Methods in Physics Research A, 737, p.176 - 183, 2014/02

 被引用回数:11 パーセンタイル:72.58(Instruments & Instrumentation)

A scintillator-based neutron-counting imaging detector with a sub-100-$$mu$$m spatial resolution was developed for energy-selective neutron imaging. The detector head of the detector comprised a thin ZnS/$$^{6}$$LiF scintillator screen, a fibre-optic taper and crossed wavelength-shifting (WLS) fibre arrays. The developed detector had a pixel size of 34 $$mu$$m $$times$$ 34 $$mu$$m, and exhibited spatial FWHM resolutions of 80 $$mu$$m and 61 $$mu$$m in the x and y directions, respectively. A small prototype detector demonstrated the capability of neutron imaging using Bragg edges of a Cu/Fe sample when using the pulsed-neutron source in the Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex.


Detector system of the $$SENJU$$ single-crystal time-of-flight neutron diffractometer at J-PARC/MLF

川崎 卓郎; 中村 龍也; 藤 健太郎; 細谷 孝明*; 及川 健一; 大原 高志; 鬼柳 亮嗣; 海老根 守澄; 美留町 厚; 坂佐井 馨; et al.

Nuclear Instruments and Methods in Physics Research A, 735, p.444 - 451, 2014/01

 被引用回数:16 パーセンタイル:83.59(Instruments & Instrumentation)

The detector system of ${it SENJU}$ - a single-crystal time-of-flight neutron diffractometer - is described. ${it SENJU}$ is the first diffractometer employing a large-area two-dimensional wavelength shifting fibre-based scintillator detector at the Material and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex. Thirty-seven detectors were installed in the instrument to cover a scattering angle of 30%. The detector modules exhibited a detector efficiency of 37-47$$pm$$1% for thermal neutrons, a $$^{60}$$Co $$gamma$$-ray sensitivity of 1.4-5.1$$pm$$0.1$$times$$10$$^{-6}$$, a background count rate of 2.1-3.8$$pm$$1.0$$times$$10$$^{-4}$$ cps/cm$$^{2}$$ and a tolerance to stray magnetic fields up to 120 gauss. The detector exhibited stable performance under the operating conditions used, such as stable count rates over 400 days and a count temperature coefficient of -0.01$$pm$$0.02%/$$^{circ}$$C at around 20$$^{circ}$$C.


Evaluation of performance for IBARAKI biological crystal diffractometer iBIX with new detectors

日下 勝弘*; 細谷 孝明*; 山田 太郎*; 友寄 克亮; 大原 高志; 片桐 政樹*; 栗原 和男; 田中 伊知朗*; 新村 信雄*

Journal of Synchrotron Radiation, 20(6), p.994 - 998, 2013/11

 被引用回数:29 パーセンタイル:84.6(Instruments & Instrumentation)



A Line pair indicator made of Gd film for evaluating spatial resolution

安田 良; 松林 政仁; 酒井 卓郎; 野島 健大; 飯倉 寛; 片桐 政樹*; 高野 勝昌*; Pikuz, T.; Faenov, A.*

Physics Procedia, 43, p.196 - 204, 2013/00

 被引用回数:1 パーセンタイル:56.94

A device for evaluating spatial resolution of a neutron imaging system was developed. By laser processes the line-pair patterns were fabricated on the 5 micrometer thick Gd film evaporated on a glass plate. Large line-pairs ranging from 0.2 to 2 mm wide were machined by Nd:YVO$$_{4}$$ laser with 30 micometer in spot size and displayed on a brightness field. Small line-pairs ranging from 0.01 to 0.1 mm wide were done by eximer laser as a dark field. In the results of SEM observation, although the large line-pairs machined by Nd:YVO$$_{4}$$ laser chipped on the corner of the Gd bars, difference between the measured and designed line-pair eidthe controled within 20 micormeter absolutely. In small line-pairs below 0.1 mm processed by the eximer laser, sharper edge could be formed than that in the large line-pairs. In neutron imaging tests using a LiF/ZnS(Ag) scintillator and a CCD camera system, good contrast images were obtained at brightness field even in 5 micrometer thick. Small line-pairs on the dark field were observed at a LiF single crystal detector, which has ultra-high spatial resolution around 5 micrometer. Split of the small line-pairs even in 0.01 mm wide were shown with good contrast on the image.


Development of an imaging system for the observation of water behavior in a channel in PEFC

野島 健大; 安田 良; 竹中 信幸*; 片桐 政樹*; 飯倉 寛; 酒井 卓郎; 松林 政仁

Physics Procedia, 43, p.282 - 287, 2013/00

 被引用回数:2 パーセンタイル:73.04



Influence of powder particle size and scintillator layer thickness on the performance of Gd$$_{2}$$O$$_{2}$$S:Tb scintillators for neutron imaging

安田 良; 片桐 政樹*; 松林 政仁

Nuclear Instruments and Methods in Physics Research A, 680, p.139 - 144, 2012/07

 被引用回数:11 パーセンタイル:69.43(Instruments & Instrumentation)

Gd$$_{2}$$O$$_{2}$$S:Tb scintillator has much higher neutron-capture cross-section than ZnS/LiF commonly used in neutron radiography. Characteristics of those scintillators correlate to some material parameters including scintillator-thickness and powder-size. Three types of Gd$$_{2}$$O$$_{2}$$S:Tb scintillator with different particle size were prepared, and effects of the powder size and thickness on the scintillator characteristics were evaluated using a sensitivity indicator (SI) and a beam purity indicator (BPI). Intensity of scintillation increases as the particle size increases. In addition, the intensity was saturated at a thickness each scintillator. It is considered that those phenomena are caused by difference in the packing rate of powder near substrate and flight path of thermal neutrons and internal conversion electrons in the scintillator.


Evaluations of the new LiF-scintillator and optional brightness enhancement films for neutron imaging

飯倉 寛; 筒井 紀彰*; 中村 龍也; 片桐 政樹*; 呉田 昌俊; 久保 純*; 松林 政仁

Nuclear Instruments and Methods in Physics Research A, 651(1), p.100 - 104, 2011/09

 被引用回数:7 パーセンタイル:53.81(Instruments & Instrumentation)



Evaluation of water distribution in a small-sized PEFC by neutron radiography

安田 良; 塩澤 方浩*; 片桐 政樹*; 竹中 信幸*; 酒井 卓郎; 林田 洋寿; 松林 政仁

電気化学及び工業物理化学, 79(8), p.614 - 619, 2011/08

 被引用回数:1 パーセンタイル:2.89(Electrochemistry)

Neutron radiography is a useful tool for visualization of water distribution in fuel cells. In this study, we prepared a high spatial resolution neutron imaging system and small-sized fuel cell, and observed the through-plane water distribution in the fuel cell after operation. Fuel cell operations were carried out while varying the gas flow rate in the constant current mode. In low flow rate conditions, voltage decreased as operation time increased, and dropped below 0.2 V at 7.5 min. In neutron images obtained after fuel cell operation, water distribution was observed around the membrane electrode assembly (MEA) at the beginning of the operation and expanded over time to the gas diffusion layer (GDL) and channel on the cathode side. In higher flow rate conditions, fuel cell operation was more stable than in the low flow rate conditions. Neutron imaging results suggest that stable fuel cell operation is attributable to water discharge due to expulsion by the gas flow.



榊 泰直; 金崎 真聡; 堀 利彦*; 福田 祐仁; 余語 覚文; 西内 満美子; 片桐 政樹*; 仁井田 浩二*

Proceedings of 8th Annual Meeting of Particle Accelerator Society of Japan (インターネット), p.667 - 669, 2011/08



Prompt in-line diagnosis of single bunch transverse profiles and energy spectra for laser-accelerated ions

榊 泰直; 西内 満美子; 堀 利彦; Bolton, P.; 余語 覚文; 片桐 政樹*; 小倉 浩一; 匂坂 明人; Pirozhkov, A. S.; 織茂 聡; et al.

Applied Physics Express, 3(12), p.126401_1 - 126401_3, 2010/11

 被引用回数:8 パーセンタイル:36.93(Physics, Applied)



A Half-millimetre spatial resolution fibre-coded linear position-sensitive scintillator detector with wavelength-shifting fibre read-out for neutron detection

中村 龍也; Schooneveld, E. M.*; Rhodes, N. J.*; 片桐 政樹; 藤 健太郎; 坂佐井 馨; 曽山 和彦

Nuclear Instruments and Methods in Physics Research A, 606(3), p.675 - 680, 2009/07

 被引用回数:10 パーセンタイル:60.37(Instruments & Instrumentation)

A fibre-coded linear scintillator detector with a half-millimetre spatial resolution was developed with wavelength-shifting fibre read-out. The head of the detector comprised a ZnS/$$^{6}$$LiF scintillator placed on the ribbon of WLS fibres. Both ends of the fibres were coded to reduce the number of read-out photomultipliers and associated electronic circuitry. The prototype detector in which the fibre ribbon was sandwiched between two ZnS/$$^{6}$$LiF scintillators exhibited a spatial resolution of 0.5 mm, a detection efficiency of 35% for 1-${AA}$ neutrons, and a $$gamma$$ sensitivity of less than $$10^{-7}$$. This type of detector would be useful where a submillimetre spatial resolution is required with large detector coverage such as in neutron reflectometers.


Wavelength-shifting-fibre-based neutron image detector with a fibre-optic taper to increase the spatial resolution

中村 龍也; 片桐 政樹; 藤 健太郎; 坂佐井 馨; 海老根 守澄; 美留町 厚; 曽山 和彦

Nuclear Instruments and Methods in Physics Research A, 604(1-2), p.158 - 160, 2009/06

 被引用回数:6 パーセンタイル:45.5(Instruments & Instrumentation)



ENGIN-X型1次元シンチレータ中性子検出器の検出器性能向上に関する技術開発; ZnSシンチレータ,光リフレクタ、及びデジタル信号処理装置の開発

中村 龍也; 片桐 政樹; 美留町 厚; 海老根 守澄; 筒井 紀彰*; 曽山 和彦; Schooneveld, E. M.*; Rhodes, N. J.*

JAEA-Research 2008-116, 26 Pages, 2009/03




波長シフトファイバを用いた高検出効率,高位置分解能型2次元シンチレータ中性子検出器の開発研究; J-PARC/MLF生命物質構造解析装置「iBIX」のためのコンパクト型検出器の開発

中村 龍也; 片桐 政樹; 細谷 孝明*; 美留町 厚; 海老根 守澄; 曽山 和彦; Schooneveld, E.*; Rhodes, N.*

JAEA-Research 2008-115, 33 Pages, 2009/03




Alpha-ray detection with a MgB$$_{2}$$ transition edge sensor

岡安 悟; 片桐 政樹; 北條 喜一; 森井 幸生; 三木 重信*; 島影 久志*; Wang, Z.*; 石田 武和*

Physica C, 468(15-20), p.1998 - 2000, 2008/09

 被引用回数:0 パーセンタイル:0(Physics, Applied)



Superconducting MgB$$_2$$ thin film detector for neutrons

石田 武和*; 西川 正利*; 藤田 賢文*; 岡安 悟; 片桐 政樹*; 佐藤 和郎*; 四谷 任*; 島影 久志*; 三木 茂人*; Wang, Z.*; et al.

Journal of Low Temperature Physics, 151(3-4), p.1074 - 1079, 2008/05

 被引用回数:36 パーセンタイル:80.07(Physics, Applied)




中村 龍也; 坂佐井 馨; 片桐 政樹; 美留町 厚; 細谷 孝明; 曽山 和彦; 佐藤 節夫*; Shooneveld, E.*; Rhodes, N.*

JAEA-Research 2007-014, 14 Pages, 2007/03


ENGIN-X型1次元シンチレータ中性子検出器を試作しその検出性能試験・評価を行った。試作した検出器は英国ラザフォードアップルトン研究所にて開発されたものでISISパルス中性子源ENGIN-X装置にて稼動しているものと同型である。試作した検出器はENGIN-X装置の1検出器モジュールであり、幅3mm,高さ196mmの中性子有感ピクセルが240チャンネル配置された構造を有する。検出器性能試験を行った結果、試作検出器が位置分解能3mm,中性子検出効率64%(中性子波長1.8${AA}$)、計数ユニフォーミティー6$$sim$$7%、$$^{60}$$Co $$gamma$$線感度$$sim$$5$$times$$10$$^{-7}$$を有することを確認し、大強度陽子加速器計画における残留応力解析や粉末回折実験装置に必要な1次元シンチレータ中性子検出器の国産化の見通しを得た。


InSb cryogenic radiation detectors

神野 郁夫*; 菱木 繁臣*; 杉浦 修*; Xiang, R.*; 中村 龍也; 片桐 政樹

Nuclear Instruments and Methods in Physics Research A, 568(1), p.416 - 420, 2006/11

 被引用回数:13 パーセンタイル:68.99(Instruments & Instrumentation)



RBPO$$_{5}$$(R=Ca, Sr)-based storage phosphors for neutron detection

坂佐井 馨; 片桐 政樹; 松林 政仁; 中村 龍也; 近藤 泰洋*

IEEE Transactions on Nuclear Science, 52(5), p.1856 - 1859, 2005/10

 被引用回数:9 パーセンタイル:55.69(Engineering, Electrical & Electronic)

中性子検出を目的として、RBPO$$_{5}$$(R=Ca, Sr)系蛍光体のストレージ特性を調べた。CaBPO$$_{5}$$:Ce$$^{3+}$$及びSrBPO$$_{5}$$:Ce$$^{3+}$$蛍光体の輝尽性蛍光出力を増大させるため、フッ素原子を導入し、その母体に対する添加モル比を最適化した。また、フッ素原子や臭素原子の導入はSrBPO$$_{5}$$:Eu$$^{2+}$$蛍光体の輝尽性蛍光出力の増大には効果的ではなかったが、Li$$_{2}$$B$$_{4}$$O$$_{7}$$粉末を導入するとその輝尽性蛍光出力が大幅に増大することを見いだした。これらの蛍光体は軽元素より構成されているため、低い$$gamma$$線感度を有する中性子ストレージ蛍光体として使用可能である。

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