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目前,在煤田核测井工作中常用的镭放射源有两种:一种是将无水纯氯化镭粉末(或无水纯溴化镭粉末)焊封在铂铱合金管中制成的金属镭源,统称为镭标准源;另一种是铀-镭平衡矿石粉末源,作为现场刻度器使用。因为这两种镭源用于标定(或刻度)核测井仪器,所以对源强的准确度和稳定性均有严格的要求。镭放射源和刻度器的强度,均为镭(Ra)组核素放射性平衡时的强度,即_(88)~(229)Ra 及其
At present, there are two radium sources commonly used in nuclear logging in coalfields: one is made by welding the anhydrous pure radium chloride powder (or anhydrous pure radium bromide powder) to the platinum-iridium alloy tube Metallic radium sources are collectively referred to as radium standard sources; the other is uranium-radium balanced ore powder sources, used as on-site scales. Because these two radium sources are used to calibrate (or scale) nuclear logging tools, they have strict requirements on the accuracy and stability of the source. The intensities of radium sources and scales are the intensities of radioactive equilibrium of radium (Ra) nuclide, ie, (88) ~ (229) Ra and its