[Backgound] The light output response function of the scintillator detector affects its detection efficiency, threshold and its future application prospects. EJ299-33A is a plastic scintillator with pulse shape discrimination properties (PSD). It can be used for the identification of neutrons, γ and charged particles in nuclear physics and nuclear technique experiments.PurposeThis study aims to achieve the energy calibration of EJ299-33A plastic scintillator, and obtain its spectrum-dose conversion G(E) function.MethodsFirst of all, a set of detector and nuclear electronics system was built by using multi-channel pulse amplitude analyzer (MCA) and a EJ299-33A plastic scintillator. Then, the light output spectrum of EJ299-33A detector was experimentally measured with standard γ source 137Cs and 60Co, and Geant4 Monte Carlo code was used to simulate the experiments. Finally, the electron energy calibration of the detector was carried out by comparing the simulation results with the experimental data to accurately determine the position of Compton edge, and neutron detection threshold was further studied by using the energy calibration of detector.Results & ConclusionsThe light responses of the EJ299-33A detector to 15 different γ energies in the range of 200 keV∼3 MeV are calculated with Geant4. The spectrum-dose converted function G(E) is obtained according to the light output results and the theoretical value of air absorbed dose.
