Abstract
A procedure for employing “electron sensitive” nuclear research emulsions as a means of detecting individual beta particles in a semi-circular spectrograph is presented. The beta spectrum may then be determined by plotting the number of electron tracks per unit area (counted with the aid of a microscope) as a function of position on the plate. Treatment of the emulsion plates is described and suggestions are given for increasing the quality of results. Intensity measurements of conversion lines can be made with great accuracy and the full resolving ability of the spectrograph can be taken advantage of. The method is found to be most effective for electrons of energies below about 40 keV having a detection efficiency of ∼ 95% down to 10 keV. The M I, M II, and M III conversion lines of the 40 keV transition in Tl 208 are shown with a line half-with of 0.09%.
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