First Quarter 2007
INL Quarterly Site Environmental Report
Return to Index
|
Sample Type |
Analysis |
Approximate Minimum Detectable Concentrationa (MDC) |
Derived Concentration Guideb (DCG) |
|
Air (particulate filter)e |
Gross alphac |
5.29 x 10-16 µCi/mL |
2 x 10-14 µCi/mL |
|
Gross betad |
1.34 x 10-15 µCi/mL |
3 x 10-12 µCi/mL |
|
|
Specific gamma (137Cs) |
1.09 x 10-16 µCi/mL |
4 x 10-10 µCi/mL |
|
|
238Pu |
1.74 x 10-18 µCi/mL |
3 x 10-14 µCi/mL |
|
|
239/240Pu |
2.06 x 10-18 µCi/mL |
2 x 10-14 µCi/mL |
|
|
241Am |
1.59 x 10-18 µCi/mL |
2 x 10-14 µCi/mL |
|
|
90Sr |
4.43 x 10-17 µCi/mL |
9 x 10-12 µCi/mL |
|
|
Air (charcoal cartridge)e |
131I |
8.97 x 10-16 µCi/mL |
4 x 10-10 µCi/mL |
|
Air (atmospheric moisture)f |
3H |
1.06 x 10-7 µCi/mLwater |
1 x 10-7 µCi/mLair |
|
Air (precipitation) |
3H |
1.04 x 10-7 µCi/mL |
2 x 10-3 µCi/mL |
|
Milk |
131I |
0.70 pCi/L |
-- |
|
|
137Cs |
2.48 pCi/L |
-- |
|
Game Animal Tissueg |
137Cs |
0.87 pCi/kg |
-- |
|
a The MDC is an estimate of the concentration of radioactivity in a given sample type that can be identified with a 95 percent level of confidence and precision of plus or minus 100 percent under a specified set of typical laboratory measurement conditions. b DCGs, set by the DOE, represent reference values for radiation exposure. They are based on a radiation dose of 100 mrem/yr for exposure through a particular exposure mode such as direct exposure, inhalation, or ingestion of water. c The DCG for gross alpha is equivalent to the DCGs for 239,240Pu and 241Am. d The DCG for gross beta is equivalent to the DCGs for 228Ra e The approximate MDC is based on an average filtered air volume (pressure corrected) of 445 m3/week. f The approximate MDC is expressed for tritium (as tritiated water) in air, and is based on an average filtered air volume of 39 m3, assuming an average sampling period of eight weeks. g The approximate MDC assumes a sample size of 500 g. |
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