【作者】 贾伟； 李俊娜； 陈维青； 汤俊萍； 何小平；

【Author】 JIA Wei;LI Jun-na;CHEN Wei-qing;TANG Jun-ping;HE Xiao-ping;Northwest Institute of Nuclear Technology;

【机构】 西北核技术研究所；

【摘要】 结合一级水线压缩、输出开关与二极管等部件,在额定输出电压600 kV的小型Marx发生器上进行了产生低能级、小剂量率X射线的实验研究。二极管参数为:阴阳级间隙3~5 mm;阴极为环形结构石墨电极,外径40 mm;阳极为1.5 mm厚的钽靶,外径200 mm。研究结果表明:当Marx发生器输出电压达到550 kV,二极管管压降196 kV时,在二极管阳极靶可以产生低能级、小剂量率X射线。阳极靶面正前方30 mm处测得X射线脉冲波形半宽20 ns,利用热释光剂量片测得靶面中心位置射线总剂量8 rad,射线辐射剂量率4×10~8rad/s。更多还原

【Abstract】 A 600 kV Marx generator accompanied with a water compression line,an output switch and a diode component is designed to generate the X ray with low energy level and low dose rate.The diode parameters are follows:gap space of anode and cathode is 3~5 mm;cathode with ring structure is a graphite electrode which diameter is 40 mm;the anode is a tantalum target with a thickness of 1.5 mm and a diameter of 200 mm.The study results show that:when the output voltage of Marx generator reaches to 550 kV,the voltage drop of the diode is 196 kV.And a low energy level,small dose rate X ray can be obtained in front of the anode.The X ray at the distance of 30 mm before the anode surface has a half width of 20 ns.The total energy dose of the X ray on the center of anode surface is 8 rad and dose rate is 4×10~8 rad/s,which have been measured by the method of thermoluminescence dosimetry.更多还原