638 TRANSURANIC ELEMENTS IN THE ENVIRONMENT 



man through ingestion routes. This was concluded on the basis that (l)the majority of 

 plutonium in the system was associated with sediments; (2) plutonium in unfiltered water 

 leaving the Rocky Flats plant site averaged <10 pCi/liter, even during pond reconstruc- 

 tion, which was below accepted maximum permissible concentration (1600 pCi/liter, 

 International Commission on Radiological Protection); and (3) plutonium concentrations 

 did not increase along simple trophic -level routes to any significant extent. 



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