Second Quarter 2005
INL Quarterly Site Environmental Report
Return to Index
Another potential pathway for contaminants to reach humans is through the food chain. The ESER Program samples multiple agricultural products and game animals from around the INL and Southeast Idaho. Specifically, milk, wheat, potatoes, garden lettuce, sheep, big game, waterfowl, and marmots are sampled. Milk is sampled throughout the year. Sheep are sampled during the second quarter. Lettuce and wheat are sampled during the third quarter, while potatoes and waterfowl are collected during the fourth quarter. See Table A-1, Appendix A, for more details on agricultural product and wildlife sampling. This section discusses results from milk and sheep sampled during the second quarter of 2005.
|Milk samples were collected weekly
in Idaho Falls and monthly at eight other locations around the INL (Figure
12) during the second quarter of 2005. All samples were analyzed for gamma
emitting radionuclides. Samples are analyzed for 90Sr and tritium
during the second and fourth quarters.
Iodine-131 (131I) and 137Cs were not detected in any milk sample during the second quarter. Data for 131I and 137Cs in milk samples are listed in Appendix C, Table C-8.
was measured above the 3s uncertainty level in all five samples analyzed.
Strontium-90 is related to uptake through the food chain of historical
weapons derived fallout. The maximum level of 90Sr in milk
measured in the Carey sample collected on May 3 was below the EPA MCL of 8
pCi/L (0.30 Bq/L) and the DOE DCG of 1000 pCi/L. Data for 90Sr in
milk samples are listed in Appendix C,
Figure 12. ESER Program milk sampling locations.
Certain areas of the INL are open to grazing under lease agreements managed by the Bureau of Land Management (Figure 13). Every year ESER Program personnel collect samples of sheep that have grazed on these leased areas, either just before or shortly after the sheep leave the INL. This occurs during the second quarter of the year. For the calendar year 2005, sheep were collected from the selected INL allotments before they were moved off site. Three flocks were sampled, including a control flock in Dubois from the Experimental Sheep Station, a flock from a southern INL allotment, and a flock from a northern INL allotment. Two sheep were taken from each flock for tissue analysis. Thyroid, muscle, and liver tissue were collected and analyzed for gamma emitting radionuclides.
Levels of 131I are of particular interest in thyroids because
of this organ's ability to accumulate iodine. No 131I was found
in thyroids from any of the animals.
No large game animals were sampled during the second quarter of 2005.
|Figure 13. Grazing and land ownership on and around the INL.|
Return to Index