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Radiat Prot Dosimetry ; 188(1): 117-122, 2020 Jun 12.
Artigo em Inglês | MEDLINE | ID: mdl-31747040

RESUMO

A current-mode neutron detector with a pair of 6Li- and 7Li-glass scintillators has been developed to measure high-flux neutrons in a boron neutron capture therapy field. Neutrons are basically measured by subtracting gamma-ray component using current outputs from the 7Li-glass scintillator. In the present study, the difference in the gamma-ray sensitivity between the 6Li- and 7Li-glass scintillators and the neutron sensitivity for the 7Li-glass scintillator due to the 6Li contamination were also considered to improve the gamma-ray subtraction precision. The gamma-ray subtraction procedure was experimentally investigated in thermal neutron fields with 252Cf and 241Am-Be neutron sources, which have different gamma-ray intensities per unit neutron fluence. A linear relation between neutron fluence and current output was obtained for the neutron detector in the two types of thermal neutron fields with different gamma-ray intensities. It was found that the gamma-ray subtraction procedure is useful for current-mode neutron detectors.


Assuntos
Terapia por Captura de Nêutron de Boro , Vidro , Isótopos , Lítio , Contagem de Cintilação/instrumentação , Amerício , Califórnio , Desenho de Equipamento , Raios gama , Humanos , Nêutrons
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