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Spectral gamma ray logging: A cost-effective method for uranium exploration

机译：光谱伽马射线测井：铀勘探的一种经济有效的方法

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摘要

The most useful technique in uranium exploration program is undoubtedly radiometric surveys. This is due to the fact that uranium emits gamma rays ranging from as low as 47kev to 2.2Mev, which can be detected and quantified using suitable radiation detector. Combination of aerial radiometric surveys, ground examination of the detected anomalies, followed by drilling and gamma ray logging of drilled boreholes has resulted in the identification of large uranium resources. Borehole logging provides the most important subsurface information required for the uranium exploration program. An area known to contain only uranium, computed gamma ray logging with a Geiger Muller (GM) Detector rapidly gives the required subsurface radioactivity information whereas, in a heterogeneously mineralized area of uranium with thorium, logging data using GM detector may mislead to wrong interpretation. Under such condition, using the principle of gamma ray spectrometry, scintillation detector-based spectral gamma ray logging is carried out. Identifying uranium in the presence of thorium is a complex process and this paper deals with a case study on the spectral gamma ray logging carried out to locate the subsurface uraniferous zone in Pakkanadu area, Salem district of Tamil nadu, where the surface anomaly indicated the presence of high thorium content. The various limitations such as small detector size, large sample volume, high-correction factor required for quantifying the individual elements, and the study carried out for optimizing the time required for data acquisition are discussed.
机译：铀勘探计划中最有用的技术无疑是辐射测量。这是由于铀发射的伽玛射线范围从47kev到2.2Mev，可以使用合适的辐射探测器进行探测和量化。结合航空辐射测量，对检测到的异常进行地面检查，然后对钻孔进行钻探和伽马射线测井，已发现了大量铀资源。钻孔测井提供了铀勘探计划所需的最重要的地下信息。已知仅包含铀的区域，使用Geiger Muller（GM）探测器进行的伽马射线测井可以迅速提供所需的地下放射性信息，而在铀含th的非均质矿化铀区域中，使用GM探测器测井的数据可能会导致错误的解释。在这种条件下，利用伽马射线光谱法的原理，进行了基于闪烁探测器的光谱伽马射线测井。 th存在下铀的鉴定是一个复杂的过程，本文以光谱伽马射线测井为例，研究了位于泰米尔纳德邦塞勒姆市Pakkanadu地区地下铀矿区的情况，该地区表面异常表明存在铀。 or含量高。讨论了各种限制因素，例如检测器尺寸小，样品量大，定量单个元素所需的高校正因子，以及为优化数据采集时间而进行的研究。

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