This method is for the determination of gross alpha radioactivity from drinking water using the coprecipitation method. All alpha-emitting radionuclides of interest (mainly radium, uranium, and thorium isotopes) are coprecipitated with barium sulfate and iron hydroxide as carriers. This separates the alpha-emitting redionuclides from other dissolved solids in the sample. The combined precipitates are filtered and counted for alpha activity.
Larger samples can be analyzed to improve sensitivity and minimize counting time.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | One year from sample collection to analysis. |
| Preservatives: | Preserve samples with concentrated HCl or HNO3 to a pH <2. |
| Required Preps: | 250mL glass or plastic bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Gas-flow proportional counting system |
| Documentation: | 
SM 7110C
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Alpha Particles | 5 |
pCi/L | ||
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.