554 TRANSURANIC ELEMENTS IN THE ENVIRONMENT 



// 



// 



/ 



X ^°Co X 0.2 



O I37cs 



A 2°"'Bi X 0.2 



'/ 



241 



+ 



Am 



239,240 



Pu 



40 60 80 



ACTIVITY, pCi/g 



100 



120 



Fig. 8 Distribution of radionuclides in the sediment core collected at station C-3. 



Eu > Am > Cs. In the 26- to 34-cm region of the core, three or four sections had the 

 order Co > Bi > Eu > Am > Cs, and in the 48- to 56-cm region of the core, the sequence 

 was Co > Am > Eu > Bi > Cs or Co > Am > Bi > Eu > Cs. Since plutonium was 

 measured in only one section from each region, its placement is not included as 

 characteristic of the larger regions. The higli 2 3 8p^^2 3 9,24 0p^ ratios found in the upper 

 12 cm of this core, however, showed that the origin of these radionuchdes was different 

 from those found in the lower regions. The radionuclides measured in the uppermost 

 sections may be remnants from one of the smaller post-Bravo tests conducted in this area. 

 The 2 3 8py|2 3 9,24 0p^ ratios of 0.036 and 0.026 fouud in the two deeper segments of the 

 core were similar to several other ratios found in surface sediments of the lagoon that 

 were collected away from the region south of tlie Tewa crater (station C-8). 



Northwest Lagoon Cores 



Three sediment cores were collected from this region of the lagoon (stations B-2, B-20, 

 and B-21). Pulverized sediments were found at all three stations, although the 

 radionuclide concentrations were significantly lower at station B-21 than at stations B-2 

 and B-20. 



