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Fundamentals of airborne gamma-ray spectrometry
机载伽马射线能谱学基础
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| 其它 | The interpretation of gamma-ray spectrometric data requires an understanding of the underlying physics of the method, and an insight into the data acquisition, system calibration, and data processing and presentation procedures. The shape and intensity of a measured airborne gamma-ray spectrum is a complex function of many variables. Source thickness, source diameter, the detector response, and the distance between the source and the detector all affect the measured spectrum. The approach taken to calibration, therefore, is empirical. The source and detector are viewed as a single system, and the response of this system to changes in aircraft height (to obtain attenuation coefficients) and sources of known geometry and concentration (to obtain sensitivity coefficients) is measured. These empirically determined constants are, however, only valid for the source and source-detector geometry used in the calibration process. |
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