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Development of a radiation detector made of a cubic boron nitride polycrystal

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Title: Development of a radiation detector made of a cubic boron nitride polycrystal
Authors: Kaneko, J.H. Browse this author →KAKEN DB
Taniguchi, T. Browse this author
Kawamura, S. Browse this author
Satou, K. Browse this author
Fujita, F. Browse this author
Homma, A. Browse this author
Furusaka, M. Browse this author
Keywords: Cubic boron nitride
High-temperature and high-pressure synthesis
Radiation detector
Boron neutron-capture therapy
Issue Date: 21-Jun-2007
Publisher: Elsevier B.V.
Journal Title: Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
Volume: 576
Issue: 2-3
Start Page: 417
End Page: 421
Publisher DOI: 10.1016/j.nima.2007.03.016
Abstract: Radiation detectors were fabricated using single and polycrystalline cubic boron nitride (cBN) crystals synthesized using a high-pressure and high-temperature (HP/HT) method. Although cBN single crystals obtained using a barium BN solvent system were nearly colorless and displayed high electrical resistance, in contrast to conventional amber-colored crystals, the single crystals exhibit a leakage current that renders them unsuitable for use in a detector. In contrast, a detector made of a cBN polycrystal synthesized by direct transformation had a very low leakage current of 0.2 pA with bias voltage of 100 V; it functioned as a radiation detector. From an experiment using α-particles, holes traversed a longer distance than electrons. It had a fast rise time of approximately 300 ns. The detector also showed sensitivity to neutrons. However, output signals were smaller than the expected voltage from the experiment using α-particles, probably because of charge accumulation from the high-neutron flux.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 金子 純一

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