Le Table [. - (Continued) Per cent abundanceat: 1) Relative Fission One One One Ten products week month year years Bal49 9.8 10.8 --- --- 13 days 300 Lal40 9.4 12.5 --- ee 40 hours 200 Ceif4 --- 2.0 26.5 --- pri44 --- 2.0 26.5 --- Pmi47 --- 5.7 15.8 —--- MPC Half Life?) values?) 285 days 100 17 mins. + 950 days 2, 000 Mn?4 290 days 1, 000 Fe55 950 days 8, 000 Fe59 45 days 600 Cod? 270 days 5, 000 Co58 71 days 1, 000 C060 1900 days 500 zn55 245 days 1, 000 Non-fission products 1) Hunter and Ballou. (1951) 2) Strominger, Hollander and Seaborg(1958) 3) MPC values relative to Sr99; based upon values from Handbook 69 for which MPC for Sr90 is 10~Sycfee * A short-lived daughter for which hazard is negligible in comparison to hazard for pa:ent