月船2号火星车上的阿尔法粒子X射线光谱仪（APXS）- Pragyan
Alpha Particle X-Ray Spectrometer (APXS) On-board Chandrayaan-2 Rover -- Pragyan
摘要：
阿尔法粒子X射线谱仪（APXS）是月球2号探测器上的两个科学实验之一。APXS的主要科学目标是确定着陆点周围地区月球表面的元素组成。这将通过采用X射线荧光光谱技术来实现，该技术使用发射X射线和α粒子的原位激发源Cm-244。这些辐射通过粒子诱导X射线发射（PIXE）和X射线荧光（XRF）的过程激发元素的特征X射线。特征X射线由称为硅漂移探测器（SDD）的最先进的X射线探测器探测，其在1至25 keV的能量范围内提供高能量分辨率以及高效率。这使得APXS能够检测所有主要的岩石形成元素，如Na，Mg，Al，Si，Ca，Ti和Fe。APXS有效载荷的飞行模型（FM）已经完成并测试了各种仪器参数。APXS在探测器工作温度约为-35 ℃时，在5.9 keV下提供135 eV的能量分辨率。本文介绍了APXS的设计细节和性能测试。
英文摘要：
Alpha Particle X-ray Spectrometer (APXS) is one of the two scientific experiments on Chandrayaan-2 rover named as Pragyan. The primary scientific objective of APXS is to determine the elemental composition of the lunar surface in the surrounding regions of the landing site. This will be achieved by employing the technique of X-ray fluorescence spectroscopy using in-situ excitation source Cm-244 emitting both X-rays and alpha particles. These radiations excite characteristic X-rays of the elements by the processes of particle induced X-ray emission (PIXE) and X-ray fluorescence (XRF). The characteristic X-rays are detected by the state-of-the-art X-ray detector known as Silicon Drift Detector (SDD), which provides high energy resolution as well as high efficiency in the energy range of 1 to 25 keV. This enables APXS to detect all major rock forming elements such as, Na, Mg, Al, Si, Ca, Ti and Fe. The Flight Model (FM) of the APXS payload has been completed and tested for various instrument parameters. The APXS provides energy resolution of 135 eV at 5.9 keV for the detector operating temperature of about -35 deg C. The design details and the performance measurement of APXS are presented in this paper.
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