Atmospheric Moisture Sampling
Twenty-one atmospheric moisture samples collected using silica gel were obtained during the third quarter of 2002. Samples were divided as follows: two samples from Rexburg, four samples from Blackfoot, six samples from Atomic City, and nine samples from Idaho Falls. Atmospheric moisture is collected by pulling air through a column of absorbent material (i.e., silica gel) to absorb water vapor. The water is then extracted from the absorbent material by heat distillation. The resulting water samples are then analyzed for tritium using liquid scintillation.
Eleven samples exceeded their respective 2s values, one from Rexburg, two from Blackfoot, three from Atomic City, and five from Idaho Falls. Five sample results (one from Atomic City, four from Idaho Falls) are questionable due to small sample size (less than 9 mL). All sample results were well below the DOE DCG for tritium in air of 1 x 10-7 mCi/mL (3.7 x 10-3 Bq/mL). The maximum value was 6.6 x 10-12 mCi/mL of air (2.6 x 10-7 Bq/mL of air). (Table C-4, Appendix C)
Results are found in Table C-4.