661 tures, comparable to happens in stellar atmospheres and in thermonuc1ear tactics, aren't thought of 1. simply because photoelectric absorption predominates thoroughly at low photon energies, and penetration thought is easy less than those stipulations, awareness is directed during this artic1e to photon energies above ""20 kev. at the excessive power facet, this artic1e doesn't hide the cascade bathe procedures that are dealt 2 with in cosmic ray reviews • during this connection it's recalled that the cascade bathe procedure, which comprises electrons and positrons along with X rays, turns into foremost above 10 Mev in heavy parts, and above a hundred Mev in gentle ones. Theories built for the examine of cascade showers in cosmic rays depend on assumptions concerning the prob skill of interactions with subject that are sufficient in basic terms at energies of the order of one Gev or extra. lower than this strength there's a hole during which penetration phenomena are qualitatively recognized and understood yet haven't but been calculated intimately. a number of specific experimental reports which were made at energies as much as three hundred Mev should be reviewed listed here.
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