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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：80.12

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

Development and installation of neutron detectors for engineering materials diffractometer at J-PARC

Sakasai, Kaoru; To, Kentaro; Nakamura, Tatsuya; Harjo, S.; Moriai, Atsushi; Ito, Takayoshi; Abe, Jun; Aizawa, Kazuya; Soyama, Kazuhiko; Katagiri, Masaki*; et al.

Proceedings of 19th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-19) (CD-ROM), 5 Pages, 2010/07

Neutron detectors for Engineering Materials Diffractometer, named TAKUMI, at J-PARC have been developed under international cooperation between Rutherford Appleton Laboratory (RAL) and Japan Atomic Energy Agency (JAEA), and installed successfully at the end of March 2009. The detector size was 805$$times$$1370$$times$$217 mm which was about 1.5 times larger than those installed in ENGIN-X, ISIS facility, RAL. Neutrons are detected based on a nuclear reaction of $$^{6}$$Li(n, $$alpha$$)$$^{3}$$H using ZnS/$$^{6}$$LiF scintillator. The data acquisition electronics and decoding module were also manufactured. The overall performances of the detectors have been tested using various sources. The results showed that the detectors had good performances such as a position resolution of 3 mm, a neutron detection efficiency of more than 50% at 1 ${AA}$-neutrons, and a $$gamma$$-ray sensitivity of less than 10$$^{-6}$$ at 1.3 MeV-$$gamma$$-ray by $$^{60}$$Co source, which met the requirements of TAKUMI, and they will be presented at the meeting.

Journal Articles

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

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

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

https://doi.org/10.1016/j.nima.2009.05.013
 Times Cited Count：12 Percentile：63.75(Instruments & Instrumentation)

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.

Oral presentation

Current status of neutron detectors for TAKUMI

Sakasai, Kaoru; Nakamura, Tatsuya; Moriai, Atsushi; Harjo, S.; Ito, Takayoshi; Abe, Jun; Aizawa, Kazuya; Soyama, Kazuhiko; Rhodes, N. J.*; Schooneveld, E. M.*

no journal, , 

no abstracts in English

Oral presentation

Neutron diffraction experiments using a small one-dimensional neutron detector

Sakasai, Kaoru; Nakamura, Tatsuya; To, Kentaro; Moriai, Atsushi; Soyama, Kazuhiko; Rhodes, N. J.*; Schooneveld, E. M.*

no journal, , 

no abstracts in English

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