RESUMO
A NE230 deuterated liquid scintillator detector (25 mm diameter x 25 mm) has been used to investigate neutron energy spectra as a function of position in a water phantom under irradiation by a quasi-monoenergetic 64 MeV neutron beam. Neutron energy spectra are obtained from measurements of pulse height spectra by the NE230 detector using the Bayesian unfolding code MAXED. The experimentally measured energy spectra are compared with spectra calculated by Monte Carlo simulation using the code MCNPX.
Assuntos
Nêutrons , Monitoramento de Radiação/instrumentação , Proteção Radiológica/instrumentação , Contagem de Cintilação/instrumentação , Análise Espectral/instrumentação , Água/química , Desenho de Equipamento , Análise de Falha de Equipamento , Doses de Radiação , Monitoramento de Radiação/métodos , Proteção Radiológica/métodos , Reprodutibilidade dos Testes , Espalhamento de Radiação , Contagem de Cintilação/métodos , Sensibilidade e Especificidade , Análise Espectral/métodosRESUMO
A stacked scintillator neutron spectrometer (S3N) consisting of three slabs of liquid organic scintillator is described. A pulsed beam providing a broad spectrum of neutron energies is used to determine the detection efficiency of the spectrometer as a function of incident neutron energy and to measure the pulse height response matrix of the system. Neutron spectra can then be determined for beams with any kind of time structure by unfolding pulse height spectra measured by the S3N. Examples of fluence spectrum measurements in the energy range 20-150 MeV are presented.