Cross sections and excitation functions have been determined for spallation and fiss-ion products from bombardments of Th 232 with helium ions (15 to 46 Mev) and u 2 33 with deuterons (9 to 24 Mev). This work extends a series of investigations of charged particle (a, d, and p) induced reactions in heavy elements (z ~ 88). Radiochemical methods were employed to isolate products corresponding to the following spallation reactions: neutron emis-, sion, (a,4n), (a,5n), (d,n), (d,2n), and (d,3n); emissionof one proton and neutrons (a,p), (a,pn), (a,p2n), and (a,p3n); and emi~sion of two protons and neutrons, (a,2p), (a,2pn), and (a,an), and (d,an). In addition, the following fission products were isolated from one or more bombardments: zn7 2 , The results show that fission is the predbminant reaction at all energies for Th 2 3 2 and to an even greater extent for u 2 33. The data for the surviving spallation products are consistent with several mechanisms of reaction, including compound-nucleus formation and evaporation, direct interactions between nucleons of the incoming helium ion or deuteron and nucleons of the nucleus, and a combination of these types of processes (direct interaction followed by evaporation). In general, the results confirm and extend previously established concepts. The fission mass-yield curves are similar to those found for other heavy target isotopes (~or elements from thorium to plutonium). The minimum in the curves in the region of mass 120 tends to disappear as helium-ion or deuteron energy is increased.The (a,pxn), (a,2pxn), (a,an), (d,n), and (d,an) products are attributed to direct interactions, with complex particles emitted in preference to a series of protons and neutrons. Thus (a,d), (a,t), and (a,tn) mechanisms would account for most of the (a,pn), (a,p2n), and (a,p3n) products, respec-In the case of the (a,t) and (a,tn) reactions, analysis of the ratio leads one to the conclusion that with 35-Mev helium ions only 9% of outgoing tritons leave the residual nucleus with sufficient energy to evaporate a neutron or undergo fission, and with 44-Mev helium ions only 20% do so. The (d,n) product probably results from the stripping reaction.