嫦娥五号月壤中子活化分析研究

Instrumental Neutron Activation Analysis for Lunar Samples Returned by Chang’E-5

  • 摘要: 我国嫦娥五号从月球风暴洋东北部、人类此前从未去过的月球中纬度地区(51.916°W, 43.058°N)采集回了新的月壤样品,弥补了40多年前美国和苏联采样区域有限的不足,拓展了月壤样品的代表性,具有重要的科研价值。中子活化分析具有高灵敏、多元素、非破坏等优点,基于中国原子能科学研究院49-2泳池堆和微型中子源反应堆,利用仪器中子活化分析方法对嫦娥五号月球表面铲取样品开展元素分析研究,使用实验室专用活化分析软件ADVNAA进行元素定量分析,获得嫦娥五号月壤样品中39种主量和微量元素信息,并与1978年美国赠送给中国的礼物Apollo-17样品数据进行对比。实验过程采用中子活化分析单比较器k0法和相对法对月壤样品元素进行定量,多种有证标准物质(如GBW07105、GBW07727、GBW07896、SRM2703、GSP2等)与嫦娥五号月壤样品一起分析,分析结果在不确定度范围内一致,确保了嫦娥五号月壤样品分析结果的准确性和可靠性。

     

    Abstract: New lunar samples retrieved by Chang’E-5 mission were collected from the lunar mid-latitudes (51.916°W, 43.058°N) in the northwest region of Oceanus Procellarum where human beings have never yet been explored, made up for the limited sampling area visited by the United States and the former Soviet Union more than 40 years ago. The Chang’E-5 samples expanded the representation of lunar samples and have extremely important value for scientific research. The concentration values of 39 elements for the Chang’E-5 samples shoveled up from the moon surface were obtained by instrumental neutron activation analysis (INAA), which has the inherent advantages of high sensitivity, multi-elemental and non-destructive analysis, etc. The neutron irradiation experiments of Chang’E-5 samples were carried out in the 49-2 Swimming Pool Reactor (SPR) and Miniature Neutron Source Reactor (MNSR) at China Institute of Atomic Energy (CIAE) for long-time and short-time INAA, respectively. And a hybrid k0-relative method software ADVNAA homemade-in NAA lab of CIAE was used for elemental quantitative analysis of the Chang’E-5 lunar samples. The analysis data obtained were compared with the elemental composition of Apollo-17 sample which was a national gift from the United States to China in 1978. In order to ensure the accuracy and reliability of the analysis of the Chang’E-5 lunar soil samples, some certified reference materials were used such as GBW07105, GBW07727, GBW07896, SRM2703, GSP2, etc. The results showed that the measured values of the quality control reference materials and the certified values were in agreement within the uncertainty range.

     

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