Abstract

L-subshell fluorescence yields of lead are determined in a series of experiments where lead atoms in lead tetraethyl, Pb(C2H5)4, in a small admixture to the propane in proportional counter are ionized in theL-shell by a beam of monochromatic X-rays. The technique of selective photoexcitation of consecutive subshells is applied and fluorescence events are resolved into subshell contributions. The subshell fluorescence yields are determined asωLI=0.16±0.04,ωLII=0.407±0.010 andωLIII=0.347±0.005.

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