Gamma Emitting Isotopes – Drinking Water
Laboratory Fee Schedule
Group: Radiochemistry
Procedure #: EZZ0142A
| Synonym(s): | Gamma in Water |
|---|---|
| Requisition Form | G-22 |
| Test Description | The determination of gamma emitters in drinking water samples. Cesium 134, Cesium 137, Iodine 131, Potassium, Gamma emitting isotopes with energies between 59.5 keV and 2000 keV as detected. |
| Pre-Approval Needed | N/A |
| Supplemental Information Required | N/A |
| Supplemental Form(s) | N/A |
| Performed on Specimens from (sources) | Environmental |
| Sample/Specimen Type for Testing | Potable water, non-potable water. |
| Minimum Volume/Size Required | Hard or soft plastic; 1 gallon + 1 liter. |
| Storage/Preservation Prior to Shipping | None - Sample must be submitted to the laboratory within 5 days of collection. |
| Transport Medium | N/A |
| Specimen Labeling | Label each bottle with a waterproof marker. Pre-printing labels is acceptable. Sample identification must match submission form. |
| Shipping and Specimen Handling Requirements | Sample must be submitted to the laboratory within 5 days of collection. |
| Method | EPA 901.1 |
| Turn-around Time | Sample must be analyzed within 180 days of sample collection. The target sample turnaround time is 120 days from date of receipt. |
| Interferences/Limitations | Due to short half-life of I-131, this method does not meet the required detection limit of 1.0 pCi/L. |
| Common Causes for Rejection |
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| Additional Information | This method is conducted as follow up to samples that exceed 50 pCi/L for gross beta radioactivity. The resulting analytical results are used to calculate the beta/photon emitter MCL in mrem/yr. |