X荧光分析仪在新疆某地的应用

介绍新一代X射线荧光分析仪在新疆某地的勘查应用,并采用几种方法对基体效应、湿度效应、不平度效应进行效正。该仪器可同时显示20余种元素的含量,测试结果证明,X荧光技术是一种快速、经济、有效的方法。     

Conversion Gain and Interpixel Capacitance of Cmos Hybrid Focal Plane Arrays

The conversion gain of optical and infrared focal plane CMOS hybrid arrays is a fundamental parameter, whose value computes into the derivation of other parameters characterizing the performance of a detector. The widespread “noise squared versus signal” method used to obtain the conversion gain can overestimate the nodal capacitance of the detector pixel by more than 20% for infrared arrays and by more than 100% for Si-PIN diode arrays. This is because this method does not take account of the capacitive coupling between neighboring pixels. A simple technique has been developed to measure the nodal capacitance directly by comparing the voltage change of an external calibrated capacitor with the voltage change on the nodal capacitor of the detector pixel. The method is elaborated in detail and has been verified with a Si-PIN diode array hybridized to a Hawaii-2RG multiplexer using an Fe ⁵⁵ X-ray source. It is also in good agreement with a stochastic method based on 2D autocorrelation.     

便携式X射线荧光分析仪的研制与应用

采用Si-PIN高分辨率探测器，研制了2408道X射线荧光分析仪，其体积小、重量轻、携带方便。能量分辨率为203eV/Mn Kα；稳定性为5％（8h）；配备了专门的、操作简便的软件系统。在地质和矿物样品中分析中进行了应用，与封闭正比计数器X射线荧光分析仪相比，检出限降低了一个数量级。     

新型电致冷半导体探测器的应用

用于探测X射线的锂漂移型硅探测器需在液氮条件下低温保存和使用,因此限制了其应用范围.介绍了一种采用电致冷方式的新型半导体探测器,并通过把液氮致冷的Si(Li)探测器与电致冷的Si-PIN探测器进行比较,论证了电致冷方法的可行性.