cOT Trt 3 TTT 4 10° L TTT TTT] rT 10° ~ P : a L 2 44 }— _ - o jw w z I = A,D22210.16 WU f oO — ~~ “7 E 4 Co 44 a 4 = 4 : -— E- q| f- — F 4 a ° 1 > 10° Re S$ £ = > ; ui oc - 10 Lot PARTICLE DIAMETER, p (a) tists 10? eet ttn 7 1 a qo wio?t = - 4 _l bi i J; A =A. °o p20lt0.30_ + > 7 og« WEe x 4J — — _— = a 1 1 + 4 <6 ot 4 4 }_ 4 = | z — , — x 4 - [| Pris mat9rdy u ) 2< | = — 3 TTT 4 L. L oS PARTICLE ACTIVITY (RELATIVE SCALE) 10° = = 4 pot bd td 10 pot PARTICLE DIAMETER, p» ft riiti 10? ws 9o& MET { — a . 47 aa 4 a 1b 1 (b) Fig. 2—Total beta activity as a function of particle diameter. bab LL 10 Lot PARTICLE DIAMETER, p (c) 10?