关于伽玛能谱数据特征参数的讨论

Discussion on characteristic parameters of gamma-spectrometric data

笔者在探讨了伽玛能谱数据 3个特征参数后认为 ,古铀含量实际上是用现代钍当量含量的衬度表征的测点铀当量含量相对于其区域平均值的变化 ,而不是“古铀丰度” ;古铀迁移量不代表“活化铀量” ;铀变迁系数等于现代铀当量含量的衬度与钍当量含量的衬度之比值 ,无法理解它代表了铀的迁入和迁出。因此 ,在区域调查中用伽玛能谱数据 3个特征参数反映古铀特征既不确切 ,也不可取。

Having discussed the three characteristic parameters of gamma-spectrometric data:paleo-uranium content,transported paleo-uranium amount and relative uranium migration coefficient,the author suggests that:the paleo-uranium content,in fact,represents a relative change of equivalent uranium content to its mean value characterize by a contrast of modern equivalent thorium content,and has nothing to do with the paleo-uranium abundance.Moreover,the transported paleo-uranium amount does not represent activated uranium content,and the relative uranium migration coefficient is a contrast ratio of modern equivalent uranium and equivalent thorium contents and can not be understood as an index of the introduction or removal of uranium.Therefore,it is neither exact,nor desirable to regard gamma-spectrometric data, the characteristic parameters of gamma-spectrometric data as paleo-uranium signature in geological survey.