Books : Assessment of the exposure pathway in the uptake and distribution of americium and cesium in cuttlefish (Sepia officinalis) at different stages of its ... of Experimental Marine Biology and Ecology]
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Format: HTML
Label: Elsevier
Manufacturer: Elsevier
Number Of Pages: 9
Publication Date: April 18, 2006
Publisher: Elsevier
Studio: Elsevier
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This digital document is a journal article from Journal of Experimental Marine Biology and Ecology, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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Laboratory radiotracer experiments were performed to study the uptake, assimilation and retention of americium (^2^4^1Am) and cesium (^1^3^4Cs) by the common cuttlefish Sepia officinalis. Uptake and loss kinetics of the radionuclides were measured following exposure through sediments, seawater and food at different stages of the animal's life cycle. Sediment was found to be a minor uptake pathway for both radionuclides in juveniles. Following a short seawater exposure, cuttlefish accumulated ^2^4^1Am and ^1^3^4Cs, but only to a limited extent (whole-body CF<2). Among the cuttlefish organs, branchial hearts and their appendages displayed the highest degree of uptake for ^2^4^1Am (CF=42 and 16, respectively), but these tissues contained low percentage of total ^2^4^1Am due to their relatively small contribution to whole organism weight. The major fraction of incorporated radionuclides was associated with muscular tissues (viz. 65% and 82% of total ^2^4^1Am and ^1^3^4Cs, respectively). Whole-body loss of ^2^4^1Am and ^1^3^4Cs was relatively rapid (T"b"1/2=14 and 6 days, respectively). After dietary exposure, around 60% and 30% of ingested ^2^4^1Am was assimilated into the tissues of juvenile and adult cuttlefish, respectively. However, assimilated ^2^4^1Am was more strongly retained in adults than in juveniles (T"b"1/2=28 vs. 5 days, respectively), suggesting that different mechanisms govern ^2^4^1Am elimination at both ages. Ingested ^1^3^4Cs was assimilated to a similar extent in juveniles (29%) and adults (23%), but the depuration rate was four times faster in adults. Our results strongly suggest that these two radionuclides follow different excretion pathways and that the mechanisms can vary with age for a given radionuclide.
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