Atmospheric Moisture Sampling
Nine
atmospheric moisture samples were obtained during the second quarter of
2001 - three from Rexburg CMS, three from Blackfoot CMS, two from Atomic
City and one from Idaho Falls. Atmospheric
moisture was collected by continuously drawing air through a column of
silica gel that absorbed water vapor.
Each sample was collected after 3-13 weeks, depending on when an
adequate amount of moisture had been extracted.
The water was then extracted from the silica gel by distillation.
The resulting atmospheric moisture samples were analyzed for
tritium using liquid scintillation.
Five
samples were greater than their associated 2s uncertainty and MDC (Table
3). For comparison, the
results measured at these locations during the second quarter of 2001
were between 87,000 and 225,000 times
lower than the DCG value for tritium
in air (as atmospheric moisture) of 1 x 10-7 µCi/mL
(3.7 x 10-3 Bq/mL). Tritium
results for all atmospheric moisture samples are listed in Table C-4
(Appendix C). TABLE 3. Atmospheric moisture samples with tritium > 2s and > MDC.
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