1 1 6 TRANS URANIC ELEMENTS IN THE ENVIRONMENT 



TABLE 1 Theoretical Number of Fission-Fragment and Alpha-Particle Tracks from 

 10' ° Atoms and the Ratio of Alpha-Particle to Fission-Fragment Tracks 



known nuclide mixtures, one of low-irradiation plutonium and one of highly enriched 

 uranium. Polycarbonate films were prepared containing particles from either one or the 

 other source. The films were irradiated and coated with emulsion, and the emulsion was 

 exposed and developed by this procedure. The number of alpha-particle and fission- 

 fragment tracks with each particle were counted. 



The data from 315 particles containing low-irradiation plutonium are given in Table 4 

 and those from 350 particles containing higlily enriched uranium are given in Table 5. 

 The data were ranked according to the number of observed fission-fragment tracks per 

 particle to determine whether the number of tracks influenced the measured ratios. The 

 mean and standard deviation of the ratios in each track interval are also given. 



