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Journal Articles

A Submillimeter spatial resolution scintillation detector for time-of-flight neutron diffraction imaging

Nakamura, Tatsuya; Kawasaki, Takuro; To, Kentaro; Tsutsui, Noriaki; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru

Proceedings of 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2018) (Internet), 3 Pages, 2019/10

https://doi.org/10.1109/NSSMIC.2018.8824447

A two-dimensional scintillation neutron detector with a submillimeter spatial resolution was developed for pulsed neutron diffraction imaging at the J-PARC MLF. The detector comprised the thin, single ZnS/$$^{6}$$LiF scintillator screen coupled with the crossed wavelength-shifting fiber array for light collection. For a high spatial resolution, the wavelength shifting fibers with diameter of 0.1 mm were used them for assembling the detector. The prototype detector that has a neutron-sensitive area of 24 $$times$$ 24 mm$$^{2}$$ exhibited a spatial resolution of 0.20$$pm$$0.06 mm and 0.16$$pm$$0.06 mm for x and y directions, respectively. The detector had a detection efficiency of 7$$%$$ for thermal neutrons with a $$^{60}$$Co $$gamma$$-ray sensitivity in the order of 10$$^{-6}$$. In this paper detailed detector design is presented together with experimental results using the pulsed neutron beam.

Journal Articles

Diagnosis of neutron sensitivity within a scintillator/wavelength-shifting fiber coil element by using a collimated pulsed neutron beam

Nakamura, Tatsuya; To, Kentaro; Tsutsui, Noriaki; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru

Proceedings of 2016 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2016), Vol.2, p.1506 - 1508, 2018/01

https://doi.org/10.1109/NSSMIC.2016.8069779

Position-dependent neutron sensitivity within an element of the scintillator / wavelength-shifting fiber coil (SFC) was evaluated by using a collimated pulsed neutron beam at the J-PARC/MLF. The collimated beam that has a size of 1 $$times$$ 1 mm$$^{2}$$ was scanned over the SFC element. The neutron counts were recorded and plotted in each incident position. The scanning results showed less neutron sensitivity at the juncture of the rolled scintillator, suggesting less light collection efficiency or a lack of scintillator materials due to imperfect manufacturing process.

Journal Articles

Development of a position-sensitive scintillation neutron detector for a new protein single-crystal diffractometer at J-PARC MLF

Nakamura, Tatsuya; To, Kentaro; Tsutsui, Noriaki; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru

Journal of Instrumentation (Internet), 12(12), p.C12025_1 - C12025_9, 2017/12

https://doi.org/10.1088/1748-0221/12/12/C12025
 Times Cited Count：1 Percentile：6.15(Instruments & Instrumentation)

A high-spatial-resolution, large-area position-sensitive scintillation-based neutron detector module has been developed for a new time-of-flight Laue single-crystal diffractometer to be constructed at J-PARC MLF. A first prototype detector implementing commercial $$^{6}$$Li:ZnS screens was produced based on a scintillator/wavelength-shifting fibre technology. The detector exhibited a spatial resolution of 2.5 mm with a neutron-sensitive area of 320 $$times$$ 320 mm$$^{2}$$. We report on an initial evaluation of the detector performance, including its spatial resolution, detection efficiency and long-term background measurement, and also provide a brief description of a new neutron instrument.

Journal Articles

Development of a ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ scintillator with low-afterglow phosphor

Nakamura, Tatsuya; Katagiri, Masaki*; Tsutsui, Noriaki*; To, Kentaro; Rhodes, N. J.*; Schooneveld, E. M.*; Oguri, Hirofumi*; Noguchi, Yasunobu*; Sakasai, Kaoru; Soyama, Kazuhiko

Journal of Physics; Conference Series, 528, p.012043_1 - 012043_8, 2014/07

https://doi.org/10.1088/1742-6596/528/1/012043
 Times Cited Count：3 Percentile：79.28

We have developed a ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ scintillator that has a high light output with less afterglow for neutron scattering instruments in the J-PARC/MLF. A commercial ZnS/$$^{6}$$LiF scintillator has widely been used for thermal neutron detection and its superior light output with low $$gamma$$ sensitivity has been proven. However its large afterglow followed with a primary emission light gives a limit on a detector count rate. A detector in the J-PARC/MLF should have a capability to cope with higher count rate than ever since the source flux is increasing up to 1 MW (300 kW at present). To address such problem we have developed the ZnS phosphor that exhibited a low after glow. We have also made a neutron-sensitive scintillator in combination with a $$^{10}$$B$$_{2}$$O$$_{3}$$ by sintering method in search of high detector efficiency. The scintillator properties and the detector performances will be shown in the presentation.

Journal Articles

Investigation of the brightness enhancement using brightness enhancement films on a scintillator

Iikura, Hiroshi; Tsutsui, Noriaki*; Saito, Yasushi*; Nojima, Takehiro; Yasuda, Ryo; Sakai, Takuro; Matsubayashi, Masahito

Physics Procedia, 43, p.161 - 168, 2013/00

https://doi.org/10.1016/j.phpro.2013.03.019
 Times Cited Count：4 Percentile：83.95

Journal Articles

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

Iikura, Hiroshi; Tsutsui, Noriaki*; Nakamura, Tatsuya; Katagiri, Masaki*; Kureta, Masatoshi; Kubo, Jun*; Matsubayashi, Masahito

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

https://doi.org/10.1016/j.nima.2011.01.010
 Times Cited Count：8 Percentile：54.19(Instruments & Instrumentation)

Japan Atomic Energy Agency has developed the neutron scintillator jointly with Chichibu Fuji Co., Ltd. In this study, we evaluated the new ZnS(Ag):Al/$$^{6}$$LiF scintillator developed for neutron imaging. It was confirmed that the brightness increased by about double while maintaining equal performance for the spatial resolution as compared with a conventional scintillator. High frame-rate imaging using a high-speed video camera system and this new scintillator made it possible to image beyond 10000 frames per second while still having enough brightness. This technique allowed us to obtain a high-frame-rate visualization of oil flow in a running car engine. Furthermore, we devised a technique to increase the light intensity of reception for a camera by adding brightness enhancement films on the output surface of the scintillator. It was confirmed that the spatial resolution degraded more than double, but the brightness increased by about three times.

JAEA Reports

Development for upgrading Japanese ENGIN-X type linear scintillation neutron detectors; Development of new ZnS scintillator, light reflector and digital signal processing module

Nakamura, Tatsuya; Katagiri, Masaki; Birumachi, Atsushi; Ebine, Masumi; Tsutsui, Noriaki*; Soyama, Kazuhiko; Schooneveld, E. M.*; Rhodes, N. J.*

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

JAEA-Research-2008-116.pdf:4.25MB

New ZnS scintillator, light reflector and digital signal processing modules were developed to upgrade the Japanese ENGIN-X type linear scintillation neutron detector. The developed ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ scintillator improved detector efficiency by a factor 1.2 for neutrons with a wavelength of 1 ${AA}$ whilst the detector maintained similar $$gamma$$ sensitivity and multi-count ratio compared to the present AST (4:1) scintillator. The paint coating less light reflector was developed with an aluminum reflector with etched surface. The detector implemented with this reflector exhibited similar detector performances with paint coating reflectors, confirming feasibility of the reflector with long-term stability. The digital signal-processing module incorporating photon-counting method was successfully developed. The fully digitalized photon counting system improved a temperature stability of neutron counts significantly comparing to the present analogue system.

Journal Articles

High detection efficiency ZnS scintillator for a fiber-coded linear neutron detector for thermal neutron scattering instruments

Nakamura, Tatsuya; Schooneveld, E. M.*; Rhodes, N. J.*; Katagiri, Masaki; Tsutsui, Noriaki*; To, Kentaro; Sakasai, Kaoru; Soyama, Kazuhiko

2008 IEEE Nuclear Science Symposium Conference Record (CD-ROM), p.1215 - 1219, 2009/02

https://doi.org/10.1109/NSSMIC.2008.4774623

High detector efficiency ZnS/$$^{6}$$LiF scintillator and ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ ceramic scintillator were developed for a fiber-coded linear neutron detector for thermal neutron detection. Detector performances of the detector equipped with such scintillator strips were evaluated in terms of neutron detector efficiency, $$gamma$$ sensitivity, and quiet counts rate. The detector equipped with the ZnS/$$^{6}$$LiF scintillator that contained twice amount of $$^{6}$$Li compared to the conventional scintillator (ZnS/$$^{6}$$LiF scintillator produced by AST Co Ltd) exhibited about 30% higher detector efficiency for 1-${AA}$ neutrons. The fiber-coded detector equipped with the ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ ceramic scintillator also exhibited about 30% larger neutron counts than the detector made with the conventional scintillator and exhibited 40% shorter decay time than the conventional scintillator, indicating a potential for higher count rate capability.

Journal Articles

Neutron scintillators with high detection efficiency

Kojima, Takahiro*; Katagiri, Masaki; Tsutsui, Noriaki*; Imai, Koji*; Matsubayashi, Masahito; Sakasai, Kaoru

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.325 - 328, 2004/08

https://doi.org/10.1016/j.nima.2004.05.005
 Times Cited Count：36 Percentile：89.46(Instruments & Instrumentation)

no abstracts in English

Journal Articles

$$^{238}$$U M$"o$ssbauer study of UPt$$_{3}$$

Tsutsui, Satoshi; Nakada, Masami; Nasu, Saburo*; Haga, Yoshinori; Yamamoto, Etsuji; Kimura, Noriaki*; Onuki, Yoshichika

Journal of Magnetism and Magnetic Materials, 226-230(Part.1), p.87 - 88, 2001/05

no abstracts in English

Oral presentation

Development of scintillator based neutron detectors for intense pulsed neutrons, 14; Development of ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ ceramic scintillator

Katagiri, Masaki; Tsutsui, Noriaki*; Kojima, Takahiro*; Schooneveld, E.*; Rhodes, N.*; To, Kentaro; Sakasai, Kaoru; Soyama, Kazuhiko; Nakamura, Tatsuya

no journal, , 

ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ ceramic scintillator was developed to improve a detector efficiency of the fibre-coded position sensitive neutron detector. The developed scintillator improved the detector efficiency by a factor 1.2 for neutrons with a wavelength of 1 ${AA}$.

Oral presentation

High detector efficiency neutron sensitive ZnS scintillator for TAKUMI instrument in J-PARC/MLF

Nakamura, Tatsuya; Sakasai, Kaoru; To, Kentaro; Katagiri, Masaki; Soyama, Kazuhiko; Rhodes, N.*; Schooneveld, E. M.*; Tsutsui, Noriaki*

no journal, , 

no abstracts in English

Oral presentation

A Large area position-sensitive scintillator neutron detector using wavelength-shifting fibers

Nakamura, Tatsuya; Tsutsui, Noriaki*; Katagiri, Masaki*; To, Kentaro; Sakasai, Kaoru; Birumachi, Atsushi; Ebine, Masumi; Soyama, Kazuhiko

no journal, , 

JP, 2010-003182   Patent publication (In Japanese)

A position-sensitive neutron detector that can be alternative to a conventional helium-3 gas detector is vital to address emerging helium-3 shortage problem. We have proposed a new position-sensitive scintillator detector that employs wavelength-shifting fibers for light read out. The small prototype detector that has pixels of 7 $$times$$ 8 with a pixel size of 5 $$times$$5 mm exhibited a spatial resolution of 5 mm, $$gamma$$ sensitivity of about $$10^{-6}$$ and a detector efficiency of about 30% for thermal neutrons. This type of detector is one of the promising candidates for the helium-3 detector alternatives.

Oral presentation

Evaluation of the new Li-scintillator used thermal neutron radiography and the optional brightness-up sheet

Iikura, Hiroshi; Tsutsui, Noriaki*; Nakamura, Tatsuya; Katagiri, Masaki*; Kureta, Masatoshi; Kubo, Jun*; Matsubayashi, Masahito

no journal, , 

Japan Atomic Energy Agency has developed the neutron scintillator jointly with Chichibu Fuji Co., Ltd. In this study, we evaluated the new $$^{6}$$LiF/ZnS scintillator developed for neutron imaging. It was confirmed that brightness becomes light about 3 times while maintaining the equal performance for the spatial resolution compared with the conventional product. When high frame rate imaging was performed using high-speed-imaging system and this scintillator, it became possible to image beyond 10,000 frames per second while having enough brightness. This technique enabled us to get real-time imaging of behavior of oil in automobile engine accurately.

Oral presentation

A Large area position-sensitive scintillator neutron detector using wavelength-shifting fibers, 2; Detector performances of prototype detector

Nakamura, Tatsuya; Sakasai, Kaoru; To, Kentaro; Birumachi, Atsushi; Ebine, Masumi; Soyama, Kazuhiko; Katagiri, Masaki*; Tsutsui, Noriaki*

no journal, , 

A position-sensitive neutron detector that can be alternative to a conventional helium-3 gas detector is vital to address emerging helium-3 shortage problem. We have proposed a new position-sensitive scintillator detector that employs wavelength-shifting fibers for light read out. The prototype detector that has pixels of 64 $$times$$ 64 with a pixel size of 5 $$times$$5 mm was prepared. The detector exhibited a spatial resolution of 5 mm, $$gamma$$ sensitivity of about 10$$^{-6}$$ and a detector efficiency of about 20% for thermal neutrons, confirming the feasibility as a beam line detector for the single crystal diffractometer.

Oral presentation

A Large area position-sensitive scintillator neutron detector using wavelength-shifting fibers, 3; Design and evaluation of detector performance for beam line detector

Nakamura, Tatsuya; Kawasaki, Takuro; Sakasai, Kaoru; To, Kentaro; Birumachi, Atsushi; Ebine, Masumi; Soyama, Kazuhiko; Katagiri, Masaki*; Tsutsui, Noriaki*

no journal, , 

A position-sensitive neutron detector that can be alternative to a conventional $$^{3}$$He gas detector is vital to address emerging $$^{3}$$He shortage problem. We have developed a new position-sensitive scintillator detector that employs wavelength-shifting fibers for light read out for the beam line of 17 and 18 in J-PARC/MLF. The detector that has 64$$times$$64 pixels with a each size of 4$$times$$4 mm exhibited a spatial resolution of 4 mm, $$gamma$$ sensitivity of about 10$$^{-6}$$ and a detector efficiency of 30-40% for thermal neutrons. These detector performances surely satisfied the detector specifications required to the beam line of 17 and 18.

Oral presentation

A Two-dimensional scintillation neutron detector module for a new protein single crystal neutron diffractometer at J-PARC MLF

Nakamura, Tatsuya; To, Kentaro; Tsutsui, Noriaki; Ebine, Masumi; Birumachi, Atsushi

no journal, , 

A position-sensitive scintillation detector module for a new protein neutron diffractometer was developed by using a scintillator / wavelength shifting (WLS) fiber technology. The detector module has a spatial resolution of 2.5 mm with a neutron-sensitive area of 320 $$times$$ 320 mm$$^{2}$$. The WLS fibers are arranged in a regular pitch of 2.5 mm in x and y direction and those arrays are placed diagonally. The light reflecting grid is inserted in between the fibers in order for optical isolation and for mechanical support of the fiber. The detector implemented flat $$^{6}$$Li/ZnS screens up and downstream of the WLF fiber arrays. The detector exhibited a detection efficiency of 30-50% for thermal neutron (depending on $$gamma$$-ray sensitivities) and a count uniformity of ~13%. In this paper detailed detector design and experimental results obtained using a pulsed neutron beam are presented.

Oral presentation

Development of scintillation neutron detector J-PARC MLF

Nakamura, Tatsuya; To, Kentaro; Tsutsui, Noriaki; Sakasai, Kaoru

no journal, , 

We have developed various types of two-dimensional scintillation neutron detectors for neutron scattering instruments in the J-PARC MLF. Particularly the detector type using neutron-sensitive scintillation screen coupled with wavelength-shifting fibers has great flexibility in detector design, and they have been successfully employed for the beamline detectors. In this paper present status of the new detector development including 100-um spatial resolution imager, BIX-P2 detector will be presented.

Oral presentation

High-resolution scintillation neutron detector for ToF neutron diffraction imaging

Nakamura, Tatsuya; Kawasaki, Takuro; To, Kentaro; Tsutsui, Noriaki; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru

no journal, , 

A two-dimensional neutron detector with a spatial resolution of 200 um was developed for neutron diffraction imaging at J-PARC MLF. The detector was designed by using a thin scintillator screen and wavelength shifting fibers to fulfill the requirement for our demonstrative diffraction experiment planed in the MLF. In this paper design and experimental results of the developed detector are presented.

19 (Records 1-19 displayed on this page)
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