434 TRANSURANIC ELEMENTS IN THE ENVIRONMENT 



TABLE 7 Plutonium Concentration Ratios and 

 95% Confidence Intervals of Ecosystem Compartments 

 in Rocky Flats Macroplot 1 with 0- to 3-cm-Deep Soil* 



Compartment Concentration ratio 95% confidence interval 



Litter 

 Vegetation 

 Arthropods 

 Small mammals 



4.9x10-' 

 3.4 X 10-' 

 6.8 X 10-' 

 7.8 X 10"' 



2.9 X 10"' -7.0 X 10-' 

 1.5 X 10-' -5.4 X 10-' 

 3.1 X lO-'-l.l X 10-' 

 2.1 X 10-^-1.3 X 10-' 



*Mean plutonium concentration in 0- to 3-cm-deep soil equals 

 835 pCi/g. Concentration ratio equals mean pCi/g compartment 

 divided by mean pCi/g in 0- to 3-cm-deep soil. 



10' 



o 



Q. 



o 



oc 



m 



I- 



5 — 



10-^ — 



5 — 



2 — 



< 



cc 



o 



z 

 o 



_J 

 a. 



10' 



5 — 



5 — 



2 — 



10° 2 



5 IqI 2 



102 2 



5 103 



PLUTONIUM CONCENTRATION IN 0- TO 3-CM-DEEP SOIL (C,), pCi/g 



Fig. 7 Plutonium concentration in litter vs. plutonium concentration in soil at the same 

 sample location. 



