132 TRANSURANIC ELEMENTS IN THE ENVIRONMENT 



equal to or less than a selected number, T, are given for sampling points A, B, C, and D in 

 Table 10. Figure 8 is a logarithmic probability plot of cumulative percent of particles 

 from each of these sampling points. Figure 9 is a similar plot for particles from four 

 locations in System I. The calculated geometric mean for the number of fission-fragment 

 tracks per particle, the geometric standard deviation, and the skewness for particles from 

 each sampling point are given in Table 1 1. Best-fit log-normal probability curves for each 

 distribution are plotted in Figs. 8 and 9. For comparison of the track distributions for 

 particles from the various sampling points in System I with those from System II, the 

 probabiUty curve for the track distribution for particles from sampling point A in 

 System II is plotted with the distributions from System I in Fig. 9. 



Table 10 Distribution of Fission-Fragment Tracks Among Plutonium-Bearing 

 Particles Collected from Sampling Points A, B, C, and D 



