m 



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 Z) 



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0) 



tr 



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H 

 O 

 < 



Odoys 



Tubificid Worms 



17 



-t 1 



37 



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1*^' I iVt-. 



024 024 024 



8 



135 



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148 



173 



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SEDIMENT DEPTH (cm)- 



Figure 4. Effect of tubificid worms on the distribution of cesium-137 



Shaded areas are the activity profiles corrected for system optics. 



Vertical lines indicate the location of the sediment-water 



interfaces. 



207 



