Ne eestereolet, ha w nN NEGATIVE SLOPE s 0 . 3 PARTICLE SIZE (MICRONS) C % o 100 Fig. 5.8 Negative Slope of Gross DecayCurvevs Particle Size From the self-absorption, self-scattering, and back-ecattering of the samples themselves, an entimate of the gross decay can be made. Such calculations yield decay rates that are slightly lower than the experi-« _ Mentally determined rates but they both follow the same trend with RIT EemT re x 7 rvs Pry a 40/tal40 equilibrium is a significant contributor to the total activity, 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, ee tem ee nn he eRe kee eS The discrepancies between the calculated values and the experimental values might be expected in view of the many approximations involved in the calculations, In general the slight decrease in decay rate with increasing particle size below 50 1 can probably be attributed to the relative increase in the activity concentration of Ca‘? with respect to the gther activities present, Since BalhO/ral0 behaves similarly to sr® y the variations in the gross de Fates are probably more pronounced at earlier times when the pc Bes A ae taeinh Nene entreeat a Re ee particle size below 50 . ee ee ee ee ee 110-200 Days