Abstract: Research on radiation protection dosimetry mainly focuses on continuous radiation, but in the fields of industrial detection, X ray diagnosis, flash X ray photography, security inspection and scientific research, pulsed ionizing radiation has been widely practised. The active electronic dosimeters are used in the fields of environment monitoring, area monitoring, personal dose monitoring and emergency monitoring. The active electronic dosimeters are calibrated in continuous radiation field and difficult to measure short pulse and high dose rate pulsed ionizing radiation accurately. In order to learn the pulsed response characteristics of the active ionizing radiation dosimeter, a pulsed X ray reference radiation field has been built based on a millisecond pulsed X ray machine, and pulsed response characteristics of four active ionizing radiation dosimeters were studied in the pulsed X ray reference radiation field. The results show that the commonly used active dosimeters are not suitable for dose measurement and early warning of short pulse and high dose rate radiation fields.

Key words: pulsed X ray, active ionizing radiation dosimeter, radiation dosimetry characteristic, Monte Carlo