| 2. | It is important that study gamma - ray spectrometry of field rock and soil in the earth ' s crust . its energies range between 30kev and 3000kev , where there is much information of natural radioactive nuclides , such as uranium , thorium , potassium , and information of artificial radioactive nuclides , such as cesium , americium , cobalt , and information of the results in interaction between gamma - ray and earth ' s crust
研究表明：野外地面射线能谱测量主要研究地壳岩石土壤中产生的能量约为30kev 3000kev的射线，这里面包含着铀、钍、钾等天然放射性核素信息，核工程活动产生的大量人工放射性核素信息以及射线与地壳相互作用产生的相关信息。 |
