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用于普查铀矿的γ能谱仪通常在校正站或校正点上校正。可以在天然地质体上选择校正点,也可制做人工校正模型。人工模型应满足校正野外γ能谱仪的物理和几何条件。校正航测能谱仪,野外轻便能谱仪和测井能谱仪所用的人工模型的形状和尺寸各不相同。本文讨论γ能谱的形状、γ辐射强度和模型的成分对校正测量值的影响。本文还涉及与含有疏松物质的人工模型有关的问题。疏松物质具有经过适当选择的 U、Th 和 K 含量,被封装在坚固的壳体内。对制造人工模型的物质的选择、模型的放射平衡、模型壳体的有效性及其尺寸和放置地点等,将在文中分别研究。为了提高校正精度,要使模型的放射强度高于岩石的强度。用于校正野外γ能谱仪的模型的参数,对建立测区的校正基地也适用。
Γ spectrometers used for census uranium mines are usually calibrated at calibration stations or calibration points. You can select the calibration point in the natural geological body, but also make artificial correction model. The artificial model should meet the physical and geometric conditions for correcting field γ spectrometer. The artificial models used to calibrate ESS, FES, and EWS vary in shape and size. This article discusses the effects of the gamma spectrum shape, gamma radiation intensity, and the composition of the model on the calibration measurements. This article also addresses the issues related to artificial models containing loose matter. Loose material with appropriately selected U, Th, and K contents is encapsulated in a rugged housing. The selection of materials for making the artificial model, the model’s radiometric balance, the validity of the model shell and its dimensions and place of placement will be studied separately in this paper. In order to improve the accuracy of calibration, the radiation intensity of the model should be higher than that of rock. The parameters used to calibrate the model of the field gamma spectrometer also apply to the calibration base that establishes the zone.