2024-03-29T07:44:03Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/280052022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Development of a radiation detector made of a cubic boron nitride polycrystal1000090333624Kaneko, J.H.Taniguchi, T.Kawamura, S.Satou, K.Fujita, F.Homma, A.Furusaka, M.open accessCubic boron nitrideHigh-temperature and high-pressure synthesisRadiation detectorα-ParticlesNeutronsBoron neutron-capture therapy433.59Radiation 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.Elsevier B.V.2007-06-21engjournal articleAMhttp://hdl.handle.net/2115/28005http://www.sciencedirect.com/science/journal/01689002https://doi.org/10.1016/j.nima.2007.03.0160168-9002Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment5762-3417421https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/28005/1/NIMP576-2-3.pdfapplication/pdf585.43 KB2007-06-21