Aiming at the characteristics of short pulse time and high instantaneous dose rate of pulsed X-ray,a TLD-based few-channel spectrometer is studied.In this paper,the basic structure and principle of the spectrometer are introduced,the absorption plates and detectors of the spectrometer are selected.The energy response matrix of the few-channel spectrometer for single energy photons of different energies is simulated by Monte Carlo method and its influence on the energy resolution of the spectrometer is analyzed.The maximum entropy method is used to verify the pulsed X-ray spectrum resolution.The results show that the TLD-based few-channel spectrometer can be used to measure short pulse and high dose rate pulse X-ray energy spectrum,and it is also suitable for other high dose rate radiation fields.
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