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Journal Articles

Development of ZnS/$$^{6}$$LiF scintillating and MSGC neutron detectors in JAERI

Nakamura, Tatsuya; Katagiri, Masaki; Yamagishi, Hideshi; Tanaka, Hiroki; Sakasai, Kaoru; Soyama, Kazuhiko

Hamon, 15(1), p.67 - 73, 2005/01

Development of scintillating and gaseous neutron detectors in Japan Atomic Energy Research Institute is briefly described. In this paper, the performances of the developed 2-d neutron detectors, concerning ZnS/$$^{6}$$LiF scintillating detectors with wavelength shifting fiber read-out and micro-strip gas chambers with individual read-out, are presented.

Journal Articles

Development of a high-performance microstrip gas chamber with a capability of track discrimination for neutron detection

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

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.336 - 341, 2004/08

 Times Cited Count:6 Percentile:42.01(Instruments & Instrumentation)

A microstrip gas chamber (MSGC) with a capability of track discrimination for neutron detection was developed whilst ensuring the stability of the MSGC and fulfilling the specifications required for detectors using in high-flux reactors and high-intensity pulsed-neutron sources. The developed two-dimensional detector system comprises a MSGC with individual signal channel read-outs and a new instrument system with a capability of secondary-particle discrimination (InSPaD). The InSPaD identifies the particles -proton and triton- created in the nuclear reaction $$^{3}He + n rightarrow p + T$$ by a simple, fast and cost-effective method using the difference in the track length, and it enables a small amount of heavy gas such as $$C_{2}H_{6}$$ with helium-3 to be used as the filling gas whilst achieving a high spatial resolution.

Journal Articles

Neutron detection by superconducting tunnel junctions on a Li$$_{2}$$B$$_{4}$$O$$_{7}$$ single-crystal absorber

Nakamura, Tatsuya; Katagiri, Masaki; Ukibe, Masahiro*; Ikeuchi, Takashi*; Okubo, Masataka*

Nuclear Instruments and Methods in Physics Research A, 520(1-3), p.67 - 69, 2004/03

 Times Cited Count:27 Percentile:84.9(Instruments & Instrumentation)

We succeeded in detecting neutrons using superconducting tunnel junctions (STJs) fabricated on a single crystal of Li$$_{2}$$B$$_{4}$$O$$_{7}$$. Neutrons are captured in the crystal by the nuclear reactions $$^{6}$$Li + n $$rightarrow$$ T+ $$alpha$$ + 4.78 MeV and $$^{10}$$B + n $$rightarrow$$ $$^{7}$$Li + $$alpha$$ + 2.3 MeV, and generated phonons propagate in the absorber and are measured by the STJs. We selected a single crystal of Li$$_{2}$$B$$_{4}$$O$$_{7}$$ as the absorber material because of properties such as the large neutron cross-section of $$^{6}$$Li and $$^{10}$$B, low $$gamma$$-ray sensitivity, short particle range in the substrate, and fast phonon velocity. Series-connected or multiple STJs on the crystal would enable two-dimensional neutron imaging with high detection efficiency, low gamma-ray background, and a high spatial resolution of a few microns. We demonstrate neutron detection by the STJs and show their X-ray response and neutron detection. The correlation in pulse heights between two junctions located 1.3mm apart clearly indicates the possibility of neutron imaging.

Journal Articles

Design and characteristics of the JRR-3M thermal neutron radiography facility and its imaging systems

Matsubayashi, Masahito; Kobayashi, Hisao*; Hibiki, Takashi*; Mishima, Kaichiro*

Nuclear Technology, 132(2), p.309 - 324, 2000/11

 Times Cited Count:24 Percentile:81.91(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Advancement of neutron radiography technique in JRR-3M

Matsubayashi, Masahito

JAERI-Conf 99-006, p.361 - 366, 1999/08

no abstracts in English

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