APPENDIX V PHYSICAL CONSTANTS* FISSION ENERGY For the purposes of SUNSHINE, we shall use the standard Los Alamos radiochemicalscale. 1, U*fission: 1.42 X 103 fission gives 1 KT TNT equivalent (1 KTE), or 1 kg U?*5 + 18 KTE. 2. Pu?fission: 1.35 X 103 fission gives 1 KTE or 1 kg Pu2?*-> 18.7 KTE. STRONTIUM 90 AND YTTRIUM 90 Ty (Sr) = 19.9 + 0.3 year, E,(Sr°°) = 0.54 Mev, () Ty(Y) = 61 hr, Eg(Y¥°°) = 2.24 Mev.!?) Most, if not all, of the Sr% originates in this manner in fission. The yield of Sr®°° in thermal fission of U235 is 4.62, +15%, —6%.t Thus 1 KTE energy release of U?3* results in the production of (4.62) (1.42 X 1025) (90) Ao see OePe 20 (100) (6.02 X 1028) 0.98 gm Sr, Now, Af S520) — 0.693 eae Stadia TPIS.00 X 10") *For corrections to some of these data refer to the Preface of this report. +Private communication from Anthony Turkevich, Institute for Nuctear Studies, University of Chicago, July 17, 1953. 91