Menon Rakhee, Roy Amitava, Mitra S, Sharma A, Mondal J, Mittal K C, Nagesh K V, Chakravarthy D P
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
Rev Sci Instrum. 2008 Oct;79(10):103301. doi: 10.1063/1.3005485.
Flash x-ray generation studies have been carried out in KALI-5000 Pulse power system. The intense relativistic electron beam has been bombarded on a tantalum target at anode to produce flash x-ray via bremsstrahlung conversion. The typical electron beam parameter was 360 kV, 18 kA, and 100 ns, with a few hundreds of A/cm(2) current density. The x-ray dose has been measured with calcium sulfate:dysposium (CaSO(4):Dy) thermoluminescent dosimeter and the axial dose distribution has been characterized. It has been observed that the on axis dose falls of with distance approximately 1/x(n), where n varies from 1.8 to 1.85. A maximum on axis dose of 46 mrad has been measured at 1 m distance from the source. A plastic scintillator with optical fiber coupled to a photomultiplier tube has been developed to measure the x-ray pulse width. The typical x-ray pulse width varied from 50 to 80 ns.
在KALI - 5000脉冲功率系统中开展了闪光X射线生成研究。强相对论性电子束轰击阳极处的钽靶，通过轫致辐射转换产生闪光X射线。典型的电子束参数为360 kV、18 kA和100 ns，电流密度为几百A/cm²。已使用硫酸钙:镝（CaSO₄:Dy）热释光剂量计测量了X射线剂量，并对轴向剂量分布进行了表征。据观察，轴上剂量随距离以约1/xⁿ的形式下降，其中n在1.8至1.85之间变化。在距源1 m处测得的最大轴上剂量为46 mrad。已开发出一种与光电倍增管耦合光纤的塑料闪烁体来测量X射线脉冲宽度。典型的X射线脉冲宽度在50至80 ns之间变化。
