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The relation between grain density in photographic tracks and particle energy has been derived theoretically assuming that the probability that a grain be developed is given by P=c[1-exp[-b(dE/dR)1/2]. Using a single pair of parameters b and c we can represent with this equation all experimental curves so far published for alpha-particles, tritons, protons, π and μ mesons (University of Bristol). The agreement between experiments and theory is very satisfactory.
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M. Blau (1949) studied this question.
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