论文部分内容阅读
一、自然伽玛曲线反映煤层灰分的原理煤的主要成分是碳,碳在自然界中,绝大部分是碳-12和碳-13,碳的放射性同位素有碳-11和碳-14两种。这两种放射性同位素都只放出β射线。其中,碳-11的半衰期只有20.4分钟,因此,实际上在煤层中是不存在的。碳-14放出的β射线能量为0.155百万电子伏,它的半衰期长一些,也只有5720年,相对于我国几个主要成煤时期,距现在以千万年计的时间来说,是很短暂的。所以,在我们勘探的煤田煤层中,碳-14衰变到现在,其数量也
First, the natural gamma curve reflects the principle of coal ash Coal is the main component of carbon, carbon in nature, the vast majority of carbon -12 and carbon -13, carbon radioisotope carbon -11 and carbon -14 two. Both radioactive isotopes only emit beta radiation. Among them, the carbon-11 half-life of only 20.4 minutes, therefore, in fact, is not present in the coal seam. Carbon-14 emits beta-ray energy of 0.155 million eV, its half-life is longer, only 5720 years, relative to several major coal-forming periods in our country, from the present time of thousands of years, it is very Short-lived. So, in the coal seams we explored, carbon-14 decays to the present, and its number is also