In the reading from a wireline log (see well logging) an expression from a gamma-ray sonde showing a progressive upward increase in the gamma reading, indicating a change in the clay-mineral content.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。