Quantification of dry concentration factor for Cs-134 in marine diatom Thalassiosira Weissflogii Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/js956j41b

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  • The Fukushima Daiichi nuclear disaster of 2011 made it apparent that releases of fission products to marine environments is a very real possibility. Additional data on the movement of material through marine environments can be used by radioecology personnel to assist with both ecosystem protection as well as environmental cleanup planning. Batches of the marine diatom Thalassiosira Weissflogii were grown in a laboratory environment for the purpose of quantifying the dry concentration factor for ¹³⁴Cs. Samples were grown in f/2 enriched seawater under 12 hour light/dark cycles at 22°C, spiked with approximately 200 Bq/ml of ¹³⁴Cs and uptake was monitored over a twelve day period. It was expected that uptake would have been slightly higher due to the higher temperature and resulting higher growth rates, but measurement indicated that there was negligible uptake over the monitored period. These results are in close agreement with the published ICRP and IAEA values for ¹³⁴Cs despite the different growth conditions and it appears as though ¹³⁴Cs uptake is not a metabolically-driven process in the phytoplankton studied.
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