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天然γ射线测井法是核子地球物理的一种最常用的基本方法。它最适用于区分岩性和确定岩石中放射性元素的含量。到目前为止,与此方法有关的一个尚未解决的问题系测量结果应该用什么单位表示。这类测量的主要目的是求解放射性物质的含量 q,而测量结果所得到的γ射线强度 I,不完全决定于含量 q,它还受到下列因素的强烈影响:探测器的类型、钻孔的几何条件和吸收性质以及岩石的化学成分。最后的一个因素使光电吸收系数μ_(ph)随介质的当量原子序数 Zeq 变化。本文所介绍的一个长期研究项目的初步阶段详细情况。该项目是由核子技术研究所和克拉科夫核子研究所第六室共同承担的。本研究包括理论和实验的两个方面,其目的在于:当岩石中放射性元素的含量为克拉克值时,给强度 I 和含量 q 之间的那种难于明确的关系找出适当的条件。上述关系是确定岩性的一个有用因素。
Natural gamma ray logging is one of the most common basic methods of nuclear geophysics. It is best suited for distinguishing lithology and determining the amount of radioactive elements in the rock. So far, an unresolved issue related to this method has been the units of measure the measurement should be made of. The main purpose of this type of measurement is to find the content q of the radioactive material, and the gamma ray intensity I obtained from the measurement is not completely dependent on the content q, but it is also strongly influenced by the type of detector, the geometry of the borehole Conditions and absorption properties as well as the chemical composition of the rock. The last factor makes the photoelectric absorption coefficient μ_ (ph) change with the equivalent atomic number Zeq of the medium. This article describes the details of the initial stages of a long-term research project. The project is shared by the Institute of Nuclear Technology and the Kraków Nuclear Institute, Room 6. This study covers both theoretical and experimental aspects. The purpose of this study is to find the appropriate conditions for the difficult to understand relationship between intensity I and content q when the content of radioactive elements in rock is Clarke. The above relationship is a useful factor in determining lithology.