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- W16477355 abstract "The US Department of Transportation (DOT) requires all radioactive materials ({ge}2 nCi/g) that are shipped on public transportation routes to be labeled as radioactive and to clearly label the level of radioactivity. The Environmental Monitoring Section (EMS) of the Westinghouse Savannah River Company (WSRC) ships many potentially radioactive samples to contract laboratories for specific chemical analyses to be performed. These samples must be analyzed for radioactivity before shipment to ensure compliance with DOT regulations, and to alert the laboratory to properly handle radioactive samples. The original radioactive screening policy was to routinely perform three analyses (tritium, gross alpha and nonvolatile beta) before shipping samples off site. However, the sensitivity of these analyses exceeded the sensitivity needed to fulfill DOT labeling requirements. Additionally the three analyses created storage problems, excessive laboratory analyses and shipment delays which have invalidated some analytical results when EPA holding times have been exceeded. An analysis for total activity using a liquid scintillation system has replaced the tritium, gross alpha and nonvolatile beta analyses, and it compares favorably with the previous procedures. The results from total activity analyses using liquid scintillation consistently fall within the uncertainty measurements for tritium results: tritium typically comprises >99% of a sample'smore » activity.« less" @default.
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- W16477355 date "1989-01-01" @default.
- W16477355 modified "2023-09-27" @default.
- W16477355 title "Measuring total activity of groundwater samples using liquid scintillation" @default.
- W16477355 hasPublicationYear "1989" @default.
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