Range Measurement of Low-Voltage Electrons

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Abstract
Determinations of the ranges of electrons between the energies of 600 and 2000 volts are difficult to perform since the short ranges of the particles cannot be detected by the usual physical methods. A biologically active molecule such as an enzyme can be used as detector in this energy region, the amount of inactivation in uniform layers of the enzyme being a function of the range of the electron. The ranges of the very low energy electrons determined in this manner were found to be considerably less than those predicted by the Bethe formula for energy loss if no allowance for scattering and straggling is made. If about 40 percent loss of range due to this is assumed, then theory and experiment are in fair agreement. Alternatively, a constant correction of 100A to be subtracted from the calculated range brings theory and experiment into agreement.

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