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Direct Detection of Fast Neutrons by Organic Semiconducting Single Crystal Detectors

机译：Direct Detection of Fast Neutrons by Organic Semiconducting Single Crystal Detectors

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摘要

Fast neutron detection is significant for neutron imaging and flux monitoring but cannot be directly achieved by inorganic semiconductors. The traditional detection is mainly mediated by an organic scintillator and a coupled photodetector, resulting in signal losses. Here, a direct detection method for fast neutrons is demonstrated based on organic semiconducting single crystals (OSSCs) detectors. Methyl 4-hydroxybenzoate (4MHB, C6H5O-COOCH3) and 4-hydroxycyanobenzene (4HCB, C6H5O-CN). The organic semiconductor acts as a fast neutron sensitive material due to its high hydrogen density, simultaneously as a semiconductor that generates the electric signal. The detectors based on 4MHB crystals can quantitatively measure the dose and energy of the fast neutron flux with a response time of 0.5 mu s and detection efficiency of 78.5% cm(-3). Effects of functional groups on fast neutron detection performances are also investigated as a guideline to synthesis new molecules for this purpose. Furthermore, neutron radiation effects on these detectors are investigated. Hydrogen-related point defects are generated by fast neutrons, but device performances remain robust after irradiation of 10(13) n cm(-2) fast neutrons. This study demonstrates that OSSCs show great potential as direct fast neutron detectors and particularly have highly-localized and tissue-equivalent properties that benefit neutron imaging and cancer therapy applications.

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