The yields of the reactions NUCLEUS 0', YP xn) 24Na have been measured for eleven elements with 13 -< Z-< 29 at maximum bremsstrahlung energies 100 MeV =< E7 max < 1000 MeV. An exponential decrease with increasing Z of the mean cross section calculated from the yield data has been obtained. This Z-dependence fits well to the systematics of spallation product cross-sections.
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