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A simple electrostatic accelerator capable of producing a monoenergetic beam of alkali metal ions at energies up to 100 kev has been used to study the range of Cs 137 ions in aluminum as a function of energy. The median range (R M ) increases linearly with energy as predicted from the Bohr–Nielsen equation, but has a value about twice that predicted by this equation. Furthermore, the observed straggling about the mean value is not Gaussian in shape, but consists of an asymmetric peak with a pronounced exponential "tail". The possible significance of these results is discussed. Preliminary results are given for the range of 30-kev Rb 86 and Na 21 ions in aluminum.
Davies et al. (1960) studied this question.