Fig. 5.8 TOT TTR nae ea neatthe MelleO Elak ay % Ss 0 . . o “100 PARTICLE SIZE (MICRONS) Negative Slope of Gross Decay Curvevs Particle Size From 110-200 Days the self-absorption, self-scattering, and back-acattering of the samples themselves, an estimate of the gross decay can be made. Such calculations yield decay rates that are slightly lower than the experimentally determined rates but they both follow the same trend with ’ particle size below 50 He The discrepancies between the calculated values and the experimental values might be expected in view of the cme tA MLS Sh es eS neema ter ee tes hw w Cs) NEGATIVE SLOPE HO 4 ets Garer ante oe al many approximations involved in the calculations, In general the slight decrease in decay rate with increasing particle size below 50 p can probably be attributed to the relative increase in the activity with respect to theae activities present, the variations in the gross 45 ies bedaatss TENT ONTOS FNP CREEP = de ¢eyJiaiho are probably more pronounced at * earlier timea when the Ba++ equilibriumis a significant contributor to the total Bake, The uranium capture products from Bravo shot completely © masked the fission product decay characteristics for the first 30 days. Unfortunately no data were obtained between 30 and 100 days, mer, Since BalsO/rali0 behaves similarly to sr°’, — Nak, ee Ah one SalLa Oaemp ne ani ee concentration of Ca>