嫦娥二号伽玛射线谱仪

Gamma-ray Spectrometer onboard Chang'E-2

嫦娥二号卫星是我国继嫦娥一号卫星成功发射后的第2颗探月卫星,其上搭载的伽玛射线谱仪(Gamma-Ray Spectrometer,GRS)的主要科学目标是探测月表O、Si、Fe、Ti、U、Th、K、Mg、Al、Ca等主量元素.相比嫦娥一号伽玛射线谱仪,嫦娥二号的能量分辨率和探测效率都大大提高.描述了嫦娥二号伽玛射线谱仪的设计和性能测试结果以及在轨飞行的初步探测成果.

The Chang＇E-2 Gamma-Ray Spectrometer （GRS） is included in the payload of Chinese second lunar mission Chang＇E-2, which has been launched in Oct, 2010. Specific objectives of the GRS are to map the abundance of O, Si, Fe, Ti, U, Th, K, and perhaps, Mg, A1, and Ca, to the depths of about 20 cm. The energy resolution and detecting efficiency are improved in comparison with the Chang＇E-1 GRS. We describe the design of the GRS and present its performance in this paper. Moreover, the initial results of Chang＇E-2 GRS are reported.