The Independence of X-Ray Absorption on Temperature

If the absorption coefficient of x-rays is dependent upon the temperature of the absorber it is pointed out that the effect can be made easily measurable by increasing the thickness of the absorber. Using this method in which the thickness was made very great, measurements have been made on Al, Cu, Fe, Ni, Ag, and Pb. Heterogeneous x-rays were used with voltages from 30 to 80 k.v., also the monochromatic x-ray lines $K{\alpha }_{1,2}$ of silver and copper were used. All measurements showed no effect of temperature on the absorption coefficients within the probable error involved in the thermal expansion coefficients.