Physics
Scientific paper
Oct 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.245..366p&link_type=abstract
Nature, Volume 245, Issue 5425, pp. 366-367 (1973).
Physics
2
Scientific paper
THE electron-photon cascade calculations of Messel and Crawford1 contain a remarkable feature which has not attracted widespread attention. Although the secondary electrons reach maximum numbers and die away in a fashion broadly consistent with previous calculations, very low energy γ rays persist in relatively large numbers to great depths of absorber. For a primary photon of 500 MeV in air, for example (Table K756 of ref. 1), and secondary electrons and photons of total energy >=1 MeV, the mean electron number falls to 0.78 at 10 radiation lengths (r.1.), and to 0.009 at 16 r.1.; but the number of photons, reaching a maximum of 11.1 at 5 r.1., is attenuated very slowly, and 5.48 are still predicted at 30 r.1. The total energy carried is 10.46 MeV, so the average predicted energy at 30 r.1. is about 2 MeV. Similarly for higher energies: a 50 GeV primary photon produces 577 γ rays of mean energy 2.04 MeV at 30 r.1. In general, it seems that for primaries of more than 500 MeV, about 2% of the primary energy reaches 30 r.1. in the form of 1 to 2 MeV γ rays; 30 r.1. in air corresponds to about 1,100 g cm-2, or sea level.
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