Abstract

A method for measuring the residual energy of alpha particles which have traversed paths of various lengths in water is described, and also a method for determining total alpha-particle range in water, the results being used to deduce a range-energy relation for alpha particles of energy up to 8.78 MeV in liquid water. A method is described for measuring the residual energy of alpha particles which have passed through air and through water vapour, and by means of a scintillation detector the complete alpha-particle range in air and in water vapour is established. From these results range-energy relations are deduced for alpha particles in air and in water vapour. The differential and integral stopping power of water and water vapour at various energies is calculated and the results are discussed.

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