The self-absorption of β-rays in radioactive films between 5 and 100 mg/cm 2 superficial density has been investigated. The marked departures from the exponential absorption law are shown to be due to scattering of the β-rays in the film. The use of very thin films to avoid the correction for self-absorption is not recommended as a routine method.
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Collie et al. (1950) studied this question.
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