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在南格陵兰Kvanefjeld地区用γ能谱测井在直径为46mm,井深200m的23个钻孔中,对一个处于放射性平衡的,与钍共生的大型铀矿床进行了评价。测井探头中有22cm~3的碘化钠,光电倍增管的增益通过电子学方法,用~133Ba基准γ射线来稳定。以25cm的深度间隔进行井中定点测量,记录四个能窗中100秒的累积计数。用计算的孔中铀和钍的每米平均计数,将其与一米一段的岩芯分析所得到的铀-钍含量进行对比来确定能谱仪系统的标定常数。铀窗内灵敏度和本底计数率从一个钻孔到另一个钻孔有明显的变化。这一变化被认为是来自孔壁的氡射气引起的。根据各个标
Gamma spectroscopy logging in the Kvanefjeld region, South Greenland, evaluated a radioactively balanced large-scale uranium deposit that was symbiotic with thorium in 23 boreholes 46 mm in diameter and 200 m in depth. Logging probe 22cm ~ 3 of sodium iodide, photomultiplier tube gain by electronically using ~ 133Ba reference γ-ray to stabilize. Wells were measured at fixed depths of 25 cm and the cumulative count of 100 seconds in the four energy windows was recorded. The calculated average uranium and thorium meter counts for each well were compared to the uranium-thorium content of a one-meter core analysis to determine the calibration constant for the spectrometer system. Uranium window sensitivity and background count rate from one drilling to another significant changes in drilling. This change is believed to be caused by radon gas from the pore walls. According to each standard