| Fj MN | Ie . a a R i] _—_—< t a ee en, FISSION YIELD, % pol 2K io”! BEET TP TN _—— U-235, a — 10 | " 70 76 82 88 S4 WO 1G JI2 118 124 130 136 142 148 154 160 MASS NUMBER Fig. 1. Comparison of the Yield-Mass Curves for the Fission of U-235, U-238, and Pu-239, Fission Yields for the Fission of Pue239 with Fast Neutrons. 7