Abstract: The yields of 11C, 18F, 45Ti, 47Sc, 57Ni, 57Co, 67Cu, 99Mo, 105Ag, 114mIn,115Cd, 111Sn, and 111 In in (γ, n) or (γ, p) reactions of 9 target discs (graphite, polyterafluoroethy-lene, Ti, Ni, Zn, Mo, Cd, In and Sn) bombarded by about 20MeV bremsstrahlung are determined by means of Ge (Li) spectrometry with 65Cu(γ, n) 64Cu as a reference reaction. The effect of the decrease in bremsstrahlung energy on the yields of these main products is examined. The yields of 22 nuclides and the upper limits of yields of 3 nuclides, both as impurity activities, are also measured or estimated. On the basis of these results, the potential of electron linear accelerator in producing these main products is evaluated, the nuclear purity that may be obtained for the main products and the requirement for decontamination of the impurity activities in chemical processing are estimated.