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Description
With the advent of new neutron sources based on accelerators for boron neutron capture therapy (BNCT), it became necessary to create an independent system for monitoring the particle flux during patient irradiation. The presented in this research results demonstrated that the proposed scintillator-over-fiber system with a silicon photomultiplier readout using three different sensors enables measurement of neutron flux, as well as estimations of the dose induced by gamma rays. Application two types of plastic scintillators SC-301 and enriched with boron SC-331 (IHEP, Protvino) allows estimate contribution of neutrons, while using an additional sensor having no scintillator at all makes it possible to estimate the contribution to the signal from the Cherenkov radiation generated in the optical fiber. The implemented system of detection optical signals based on silicon photomultipliers has a high quantum efficiency and application of counting mode used in the readout electronics made it possible to achieve intrinsic noise at the level of several tens of Hz.
The study was supported by the Russian Science Foundation grant No. 19-72-30005, https://rscf.ru/project/19-72-30005/
