Establishment of Pulsed X-Ray Reference Radiation Field and Measurement of Related Parameters

The international research on radiation protection dosimetry mainly focuses on continuous radiation. However, pulsed radiation has been widely used in the fields of new detector development, radiographic inspection, X-ray diagnosis, nuclear accident emergency and scientific research, the measurement of pulsed dose (rate) is very difficult. In order to solve the technical problem of pulse response test of active radiation dosimeter, the generation principle of pulsed X-ray and gamma ray radiation field is discussed, and the reference radiation field of pulsed X-ray is established based on three kinds of X-ray machines. Combined with the secondary standard ionization chamber and pulse width measurement system, the research of pulsed radiation dose (rate) measurement technology is carried out. The experimental results show that the pulse width of the established pulsed X-ray reference radiation field can be adjusted between 50 ns-10 s, and the instantaneous dose rate range is 2.5 mSv/h-6.7 × 10⁵ Sv/h, which can be widely used to study the pulsed X-ray response characteristics of active radiation dosimeter. This work can be widely used to study the pulsed X-ray response characteristics of active radiation dosimeter, which is of great significance to solve the calibration problem of pulsed radiation dose monitoring instrument.