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某铀矿土壤瞬时氡与累积氡测量应用效果研究
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摘要
为了比较土壤瞬时氡与累积氡测量应用效果,在南方某铀矿接替资源勘查项目的物化探方法研究中开展了瞬时氡测量与累积氡测量的对比研究。瞬时氡测量采用硅半导体测氡仪,而累积氡测量采用抗钍射气干扰、本底低、采样周期短的固体径迹法。典型剖面上方瞬时氡测量和固体核径迹实测数据表明:(1)固体核径迹氡测量的氡异常与本底的比值较大(异常衬度高);(2)在隐伏矿体上方固体核径迹的异常比瞬时氡异常明显,但曲线形态基本一致;(3)不同土壤层厚度对氡的迁移和富集在一定影响;(4)瞬时氡测量方法的工作效率大大高于累积氡测量方法。因此,依据铀矿勘查的目标和地质特征,在不同的地质条件和不同的勘查周期选择适用的氡测量方法是至关重要的。
In order to compare the application effect of instantaneous and cumulative soil radon measurement,comparative study of the two kind methods had carried out in a southern uranium mine.Measurement of instantaneous radon used silicon semiconductor radon detector,and the cumulative radon measurement used solid state nuclear track detector(SSNTD).The results of insitu of soil radon measurement and SSNTD in a typical section show that:(1) the ratio of radon anomaly of SSNTD and the radon background is larger(high anomaly contrast);(2) radon anomalies of SSNTD are more obvious than that of in-situ method in the concealed ore deposits,but the curve shape is the same;(3) soil layer thickness have some influence on the radon migration and enrichment;(4) the efficiency of in-situ method is greatly higher than SSNTD.Therefore,radon measurement application is essential in different geological conditions and different exploration cycle according to the target and the geological characteristics of uranium deposit.
引文
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