Abstract
Stopping powers of carbon (graphite) have been measured for 4–13 MeV photons. The accuracy of the results is estimated to be ±0.35%. Analyzing the present stopping powers with the usual Bethe-Bloch formula, we have extracted the mean excitation energy, I, of carbon atoms. To estimate the shell correction we used both Bichsel's method and Bonderup's theory. The Barkas correction was evaluated by the theory of Ashley, Ritchie and Brandt. The I-values obtained are 79.6 eV for Bichsel's shell correction and 80.1 eV for Bonderup's shell correction. Experimental stopping powers and I-values obtained are compared with those of other authors.
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