Abstract
In the voltage range from 0.7 to 2.5 Mv, the intensity and the total mass absorption coefficient of the heterogeneous radiation produced in a thick gold target have been measured as a function of tube voltage, angle with respect to the electron beam, and thickness and material of the filter. Curves giving the dependence of absorption coefficient on voltage are presented for lead, tin, copper, aluminum, carbon, and water as absorbers. A method is described for calculating the absorption coefficient of the heterogeneous radiation produced at a given tube voltage and subjected to a given amount of filtration, utilizing accepted values for the absorption coefficient of homogeneous radiation. Measured and calculated values of the absorption coefficients for heterogeneous radiation are in good agreement. Curves giving the dependence of intensity on angle are in qualitative agreement with approximate theory. Curves giving the dependence of absorption coefficient on angle and the dependence of intensity in the forward direction on voltage are presented. A method for calculating the efficiency of x-ray production from these data is described and used to obtain results in satisfactory agreement with theory in the voltage range from 0.90 to 2.35 Mv.
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