Abstract
The thermal neutron flux can be easily measured in real time by using the scintillator with optical fiber (SOF) detector. However the irradiation damage under high-intensity neutron flux causes deterioration of the SOF detector due to radiation damage to the plastic scintillator in which 6LiF is blended. After irradiating the SOF detector for 4 h (thermal neutron fluence is approximately 2.0×10 13 neutrons/cm 2), the sensitivity of the SOF detector decreased by 3.0%. After irradiating the SOF detector for 2 months (thermal neutron fluence approximately 6.4×10 14 neutrons/cm 2), the sensitivity was reduced to 42% of baseline. Supposing that the thermal neutron fluence is 2×10 12 neutrons/cm 2 on the surface of a patient in a BNCT treatment, the sensitivity of the SOF detector is reduced by approximately 0.3%. This report presents investigations on the deterioration of the SOF detector in irradiation experiments.
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