Summary of MDCs, DCGs and SDWA
|Sample Type||Analyte||Minimum Detectable Concentration (MDC)||Derived Concentration Guide (DCG)||Safe Drinking Water Act (SDWA) Limits||Reported Units|
|Atmospheric Moisture||Tritium||2.01 E-13||1.00E-07||mCi/mi|
|Drinking Water||Gross Alpha||6.00E-01||1.50E+01||pCi/L|
|Drinking Water||Gross Beta||2.00E+00||5.00E+01||pCi/L|
|Surface Water||Gross Alpha||6.00E-01||1.50E+01||pCi/L|
|Surface Water||Gross Beta||2.00E+00||5.00E+01||pCi/L|
1: The values in this table are expressed in shorthand
scientific notation as opposed to longhand scientific notion. For
example: 1.08 x 10-15 is expressed as 1.08E-15.
The two forms are equivalent.
MDC - The MDC is an estimate of the concentration of radioactivity in a given sample type that can be quantitatively identified with a 95% level of confidence under a specified set of typical laboratory measurement conditions.
DCG - DCGs, set by the Department of Energy, 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.
Note 2: The approximate MDC for atmospheric moisture is expressed for tritium (as tritiated water) in air, and is based on the average filtered air volume of 29.8m3.
Note 3: The approximate MDC for the charcoal cartridge and filters is based on the average filtered air volume (pressure corrected) of 378 m3/week.
Note 4: The approximate MDC for the filter composites is based on the average filtered air volume (pressure corrected) of 4723.9m3/quarter.
Note 5: There is not an SDWA limit available for tritium in precipitation, therefore, we use the Drinking Water/Surface Water limit.