提高地气探测灵敏度的方法

THE METHOD AND TECHNIQUE FOR IMPROVING THE DETECTION SENSITIVITY OF DYNAMIC GEOGAS SURVEY

在广东长排铀矿勘查区,针对矿体品位低、矿体小、埋深大等特点,改进了动态地气测量方法。采样时,通过双捕集器串联,在不延长采样时间的情况下使地气采样量提高了约50%;在进行ICP-MS分析前,对地气样品进行浓缩处理,可以将样品中的元素浓度增加3～11倍,该方法使地气中低浓度元素更易于检出,并有效降低了分析误差。实验结果证明,改进后的动态地气测量方法可以明显提高探测灵敏度,进而提高找矿效果。

In view of the uranium prospecting characteristics in Changpai uranium exploration area of Guangdong Province, such as low ore grade, small ore body, and great depth, the authors employed improved dynamic geogas survey. During sampling, a couple of capturing agents were serially connected. On the basis of the premise of stationary sampling time, the sampling quantity of geogas was improved by approximately 50%. Before ICP-MS analysis, all geogas samples were concentrated from 40 mL to 5 mL, which improved the element concentrations in samples by 3 - 11 times. On the basis of this improvement, the elements with lower concentrations in geogas could be easily detected, and the analycial error was reduced effectively. The experimental results show that the improved measures can result in higher detection sensitivity of dynamic geogas survey and can further improve the prospecting effect of geogas survey.