Historical record of tritium from tree cores at the Savannah River Site.

Autor:	Pettitt EA; Savannah River National Laboratory, Aiken, SC 29808, USA. elizabeth.pettitt@srnl.doe.gov., Duff MC; Savannah River National Laboratory, Aiken, SC 29808, USA. elizabeth.pettitt@srnl.doe.gov., VerMeulen H; Savannah River National Laboratory, Aiken, SC 29808, USA. elizabeth.pettitt@srnl.doe.gov.
Jazyk:	angličtina
Zdroj:	Environmental science. Processes & impacts [Environ Sci Process Impacts] 2022 Aug 17; Vol. 24 (8), pp. 1144-1151. Date of Electronic Publication: 2022 Aug 17.
DOI:	10.1039/d2em00193d
Abstrakt:	Tree cores from various locations at the Savannah River Site (SRS) and local area were measured for total tritium (T) content and T speciation to include tritiated water (HTO), exchangeable organic bound T (E-OBT) and non-exchangeable organic bound T (NE-OBT) species. The tree cores dated back to the 1960's or prior which provided an opportunity to measure T over the last 60-70 years. The total T levels from pine and oak tree cores were consistent with the record of known T atmospheric releases from nuclear activities at the SRS between the mid-1950's and 1990's with a notable peak in T tree core levels during the late 1960's. The T speciation data for some tree core samples from SRS demonstrated elevated levels of OBT : HTO and NE-OBT : E-OBT identified primarily in the last ∼20 years due to T inputs from remedial irrigation with OBT-rich pond water. Elevated but lower levels of OBT : HTO and NE-OBT : E-OBT were observed due to inputs from SRS operations during the last 70 years and prior to irrigation with the T-rich pond water.
Databáze:	MEDLINE
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