Abstract
A calculation has been made of the probability of a cascade particle being detected under large thicknesses of lead, taking into account the effect of the low energy photons produced in the lead. The low energy photons increase the probability of detection very greatly, and make the concept of "range" of a cascade shower in lead very indeterminate. The results have been applied to the case of large air showers, where general agreement is found between the calculated and experimental counting rates under large thicknesses.

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