Note on the Dependence of the Intensity of the Compton Effect Upon the Atomic Number

Intensity of the displaced scattered radiation as a function of atomic number.—Theory. The integrated intensity of the scattered radiation $S$ is shown to be proportional to $\frac{b}{z^3{\lambda }^3}$ where $z$ is the atomic number or number of orbital electrons and $b$ is the fraction of these that take part in the scattering. Relative intensity for paraffin, aluminum, sulphur and calcium for $\mathrm{MoK}\alpha$ radiation was found to be 8, 1.25, 0.7 and 0.35. All radiators were of the same dimensions and were carefully placed in the same position by means of guides. The results give the product $s{z}^3$ as constant except for paraffin for which, if we take $z=6\mathrm{}$ the product is too small. So far as they go, the results indicate that $b$ is constant and suggest that all the orbital electrons take part equally in the scattering effect.