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用普通的铜片,收集密封于玻璃瓶中粉末(土壤)样品释放的氡的衰变子体,通过α仪测量α粒子数来测定样品中的镭,以达到找矿的目的,简称为镭法。此法具有灵敏度高(检出限每克样品中含镭2.7×10~(-15)克),工效高,成本低和便于推广使用等优点。根据8个矿区的20条剖面上的700多个样品的测量结果表明,镭法发现异常的能力比γ测量强,与~(210)Po法相当。文中总结了深部盲矿,地表矿化和非矿异常地段上的镭法、~(210)Po法和γ测量的异常强度及其剖面曲线形态,以及镭与~(210)Po比值等特征的变化规律。根据这些规律可以区分深、浅部矿化。综合应用镭法、~(210)Po法和γ测量可作为异常评价的重要手段之一。根据100km~2面积上771个水系底沉积样品的测镭试验,表明镭法亦可用于铀矿区调、普查阶段。
With ordinary copper, collected in glass bottles sealed powder (soil) samples released radon decay progeny measured alpha particles α number to determine the sample of the radium, in order to achieve the purpose of prospecting, referred to as the radium method . This method has high sensitivity (detection limit per gram of sample containing radium 2.7 × 10 ~ (-15) grams), high efficiency, low cost and easy to promote the use of such advantages. Based on the measurements of more than 700 samples taken from 20 sections of eight mines, the radium method is more capable of finding anomalies than γ measurements, comparable to the ~ (210) Po method. The paper summarizes the anomalous intensity of ~ (210) Po and γ measurements and the shape of the profile curves, as well as the radium to ~ (210) Po ratio on the deep blind mine, surface mineralization and non-ore mine The law of change. According to these rules can distinguish between deep and shallow mineralization. Comprehensive application of radium method, ~ (210) Po method and γ measurement can be used as an important means of anomaly evaluation. According to the radium test of 771 sediments in the 100km ~ 2 area, the radium method can also be used in the uranium mining survey and census stage.