Establishment of 50-120 kV Pulsed X-ray Reference Radiation Field and Dose Rate Measurement
In order to meet the needs of accurate traceability of dose monitoring instru-ments in domestic medical,security inspection and other pulse radiation places,a 50-120 kV millisecond pulse X-ray reference radiation field that meets the requirements of norms and standards was established,based on the gate control technology,and its pulse width can be adjustable in the range of 1-6 300 ms.The pulse X-ray reference waveform was established by studying and testing the tube voltage stability,dose linear-ity,repeatability,pulse waveform and other key parameters of the radiation field,and the pulse dose rate was measured using a cylindrical ionization chamber with a sensitive volume of 30 cm3,and obtained the following research results:when the tube voltage was preset to 60 kV,the relative deviation of the intervened and non-intervened measur-ing tube voltage did not exceed±1.5％;the minimum pulse width of the reference waveform pulse output was 20 ms,and a 95％uniform radiation field with a diameter of about 5.5 cm could be generated at 1 m.Moreover,the dose rate range of N series and RQR series radiation quality was extended to 0.002-10 mGy/s and 0.03-250 mGy/s,respectively,which can be used for the metrological traceability of protective instruments.
万方数据
