神龙二号加速器可以产生三个脉冲宽度约80 ns(FWHM)、脉冲间隔约500 ns的X射线, 为了获得每个脉冲X射线剂量, 采用康普顿探测器和热释光剂量计相结合的方法进行测量。针对神龙二号加速器X射线能谱分布, 采用MCNP程序优化设计康普顿探测器, 测量多脉冲X射线信号, 获得每个脉冲的剂量比例, 应用热释光剂量计测量多脉冲X射线总剂量, 由总剂量和剂量比例准确得到每个脉冲X射线剂量, 实现神龙二号加速器多脉冲X射线剂量测量。

Dragon-Ⅱ is a linear induction accelerator, which can produce up to three bremsstrahlung X-ray pulses. Each X-ray pulse width is about 80 ns(FWHM), and time interval between pulses is about 500 ns. Each pulse X-ray dose is a critical parameter for Dragon-Ⅱ. Compton detector, combined with thermo luminescent dosemeter(TLD), was used to measure X-ray dose per pulse. MCNP program was used to design a Compton detector according to the characteristic of bremsstrahlung produced by Dragon-Ⅱ accelerator. Compton detector can measure multi-pulse X-ray signal and one pulse X-ray signal’s integral is proportional to each pulse X-ray dose, and according to the total dose of three pulse X-ray obtained from TLD, each pulse X-ray dose can be obtained accurately.