By K. Siegbahn
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Additional resources for Alpha-, Beta- and Gamma-Ray Spectroscopy
A very slight dependence on Ζ occurs only through the excitation energy / appearing in the logarithm. Bloch assumed that / is propor 28 does not hold rigorously. e. / = KZ, but this proportionality very accurate measurements of R. R. Wilson on the practical ionization curve for 29 protons in air and aluminum, the quantity / has been determined with great accuracy. Other elements were investigated by Bakker and Segré . The values of / obtained in 28 C. Bakker and E. Segré, Phys. Rev. 81 (1951) 489.
I Bohr, Bethe and Bloch; it gives a very accurate description of the phenomena. 5). 7 · >D 2S . Ι 29 0 Fig. 12. Energy distribution o f electrons passing through graphite according t o measurements of K n o p and Paul. 475 m m ρ the density and A the atomic weight. / is the mean excitation energy of the atomic electrons. 16 E/I) [MeV/cm] . -2 l n m2 22 +(l-l2) + dx A 2I mc ) 2 2 22 [MeV/cm] - ( 2 Vl - β - 1 + β ) In 2 + I (1 - Vl - β ) - A pol Since ZIA is approximately constant, dE/dx depends practically only on the density of the matter that is penetrated.
Keuper, Phys. Rev. 9 0 (1953) 1043. 627.
Alpha-, Beta- and Gamma-Ray Spectroscopy by K. Siegbahn