AbstractPure standards of molybdenum disulfide, silver, and calcium silicide particles 0.5 μm in diameter and larger, were used to obtain calibration curves for size effect on x-ray intensities. The decrease in intensity with size follows a straight line down to about 3 μm. For the smaller sizes the intensities decrease exponentially. Good agreement has been found between curves calculated using simplified models of diffusion volumes intercepted by the particles and curves of measured x-ray intensities.The intensity versus size was plotted as a percentage of the intensity of a flat, infinite standard. Therefore, the number of counts measured for a sample of known size can be converted to the intensity it would have if it were an infinite surface. These values can then be plugged into existing computer programs for quantitative analysis. Samples of atmospheric aerosols were analyzed by using these calibration curves.
On the Floation of Deoxidation Products by Calcium-Silicide addition
