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The penetration of electrons of energies between 10 and 40 kev into a number of phosphors, and the extent of their scattering, is measured on microphotographs of the luminous region produced in the phosphor by a beam of electrons of less than 0.75 μ diameter. A description is given of the apparatus and of the electron optical system designed to produce the fine focal spot. The phosphors used in the experiment were single crystals of the thallium-activated iodides of K, Rb and Cs, and of the tungstates of Ca and Cd, and a luminescent plastic. An attempt is made to account for the discrepancies in the electron ranges as found in the present experiments compared with those obtained by other methods. An estimate is made of the distribution in depth of the energy dissipation in a phosphor when bombarded by a beam of electrons.
Ehrenberg et al. (1953) studied this question.