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在根据γ测井数据确定矿石中的铀含量时,必须考虑钍可能存在的影响。因此就产生了直接根据钻孔中的测量数据分别测定铀和钍的问题。此种分别测定的原理,建立在不同脉冲积分譜的基础上,即在記录能量在l兆电子伏以上的铀矿石和钍矿石的r辐射时,閃爍计数器中产生不同的脉冲积分譜;在分析粉末样品方面,Γ.P.戈利别克等最先对该测定原理作了阐述。计算证明,在高于1.5兆电子伏能量范围内,可见到“最佳区分”。图1列出了具有相同有效原子序数的铀矿石和钍矿石的积分譜。符合于起始录阈(总计数率)的计数率作为一个单位,其他記录阈的计数率以该单位的分量表示。能譜是借助于閃爍γ譜仪在具有“γ辐射饱和体积”的矿体模型上得到的。
In determining the uranium content in ores based on gamma log data, the possible effects of thorium must be taken into account. This led to the problem of determining uranium and thorium, respectively, directly from the measured data in the borehole. The principle of these separate measurements is based on different impulse integration spectra, ie different impulse integration spectra are generated in the scintillation counter when recording r radiation of uranium ore and thorium ore with energy above 1 MeV; in In the analysis of powder samples, Γ.P. Golibic et al. First described the principle of the assay. Calculations show that “best discrimination” can be seen at energies above 1.5 mega-electron volts. Figure 1 shows the integrated spectrum of uranium ore and thorium ore with the same effective atomic number. The count rate that matches the start threshold (total count rate) is taken as one unit, and the count rates of other record thresholds are expressed as the unit’s weight. The energy spectrum is obtained by means of a scintillation gamma spectrometer on an orebody model with a “gamma-saturated volume”.