脉冲X光机的光源特性参数研究

采用模拟计算和实验测量相结合的方法对瑞典Scandiflash AB公司的脉冲X光机的光源特性参数进行详细研究。基于MCNP5编写蒙特卡罗程序对脉冲X光机的二极管进行建模,并模拟计算X射线的能谱分布;采用热释光剂量计对X光源的剂量进行监测,获得了单个阳极丝寿命期内的剂量数据;用闪烁探测器对脉冲X光机产生的X射线进行测量,获得了X光源的强度分布、脉冲半宽度、抖动规律等。     

工业脉冲X射线发生装置放射防护检测与评价方法研究

目的探讨利用热释光剂量计对工业脉冲X射线发生装置进行放射防护检测与评价的可行性。方法分别用热释光剂量计和AT1123型X/γ辐射剂量率仪测量脉冲X射线发生装置的辐射剂量,通过对测量结果的分析和比较验证热释光剂量计测量脉冲X射线的有效性,通过对周围环境中年累积剂量的估算来评价试验人员和公众的受照剂量是否满足辐射防护要求。结果1号脉冲X射线发生装置曝光4次,2号脉冲X射线发生装置曝光10次,热释光法测得不同距离处的累积剂量符合距离平方反比衰减规律,实际检测结果与理论推算值较为吻合。两个X射线发生装置现有的工作负荷下,工作人员和公众的年累积剂量均在辐射防护控制目标值内。结论热释光法得出检测结果与理论推算值较为吻合,能够满足工业脉冲X射线发生装置放射防护检测需求。     

An Experimental Study on Kr Gas-puff Z-pinch

Kr gas-puff Z-pinch experiment performed recently on Qiang-uang I pulsed power generator is reprted.The generator has a 1.5MA current with a pulse width of 100ns.The total X-ray energy as well as its spectrum has been obtained.and the average power of X-ray radiation in 50-700eV measured by XRDs is 2 TW.The generator configuration.gas-puff load assembly and diagnostic system for the experiments are described.     

Primarily Experimental Results for a W Wire Array Z Pinch

Primarily experimental results are given for a W wire array Z pinch imploded with up to 2 MA in 100 ns on a Qiangguang-I pulsed power generator. The configuration and parameters of the generator, the W wire array load assembly and the diagnostic system for the experiment are described. The total X-ray energy has been obtained with a averaged power of X-ray radiation of 1.28 TW.     

建立快脉冲硬X射线标准场的展望

提出了用研制的可重复频率快脉冲硬X射线源建立标准场的设想。对该辐射源的结构、特性以及现已取得的实验参数进行了描述,阐述了目前存在的技术难题,并对这些问题提出了解决方案。最后,对该辐射场的应用前景进行了展望。     

A nuclear spectrum generator for semiconductor X-ray detectors

A nuclear spectrum generator for semiconductor X-ray detectors is designed in this paper. It outputs step ramp signals with random distribution in amplitude and time according to specified reference spectrum. The signals are similar to the signals from an actual semiconductor X-ray detector, and can be use to check spec- trum response characteristics of an X-ray fluorometer. This helps improving energy resolution of the X-ray fluorometer. The spectrum generator outputs step ramp signals satisfying the probability density distribution function of any given reference spectrum in amplitude through sampling on the basis of 32-bit randomizer. The system splits 1024 interval segmentation of the time that the step ramp signals appear, and calculates the ap- pearance probability of step ramp signals in different intervals and the average time between the time intervals, by random sampling. The step ramp signals can meet the rule of exponential distribution in time. Test results of the spectrum generator show that the system noise is less than 2.43 mV, the output step ramp signals meet the Poisson distribution in counting rate and the probability density distribution function of the reference spectrum in amplitude. The counting rate of the output step ramp signals can be adjusted. It meets the rule of the output signals from semiconductor X-ray detectors, such as Si-pin detector and silicon drift detector.     

Fe、Co、V和Ti材料的X荧光效率测量

介绍了在Ru-200 X光机上,根据Cu靶的韧致辐射谱,采用滤波法产生单能X射线,对Fe、Co、V和Ti荧光片作荧光效率测量.给出了荧光效率的理论推导公式和实验结果,并进行了理论和实验比较.     

用于北京同步辐射的X射线衍射仪的研制

本文介绍一个为北京同步光源研制的高精度X射线衍射仪系统,它包括有精度为0.001°的转角仪、高计数率本领探测器、快电子学、计算机自动控制和在线数据获取,并给出了在转靶X光机上的实验结果。     

微束X射线荧光分析系统的建立及其在考古学中的应用

文章报道一种新型基于X光透镜的微束X射线荧光分析系统的结构、性能和特点及其在考古学中的应用。X光透镜将旋转阳极X射线发生器产生的X射线束聚成直径为几十微米的光束，可用于考古样品的无损微区分析。为检验微束分析系统的可行性，分析了1片明代青花瓷残片中青花部位的元素分布。分析结果表明：青花中Mn和Co元素的含量与青花颜色的深浅相一致。相关性分析表明：Mn和Co呈现良好线性相关；Mn和Co的含量或比值对青花的产地和真伪的辨别有重要意义。