DOE EML: Ra-02-RC: Radium-226 - Emanation Procedure - Summary
- Analytes
- Revision
- Data and Sites
Official Method Name  | Radium-226 - Emanation Procedure |
| Current Revision | EML Procedures Manual HASL-300, Volume 1, 28th Ed.(1997) |
| Media | WATER |
| Instrumentation | Pulse Ionization Chamber and Radon Bubbler |
| Method Subcategory | Radiochemical |
| Method Source |  DOE EML | Contact Information: | U.S. Department of Energy Environmental Measurements Laboratory 201 Varick St. 5th Floor New York, NY 10012-4811 |
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| URL: | http://www.eml.doe.gov | |
| Citation | DOE EML Procedures Manual HASL-300, Volume 1, 28th Ed.(1997) | Citation Information: | The EML Procedures Manual, HASL-300, has served as a significant resource for scientists throughout the world who collect samples, perform field measurements or analyze samples. The Manual includes sections on Quality Assurance, Sampling Techniques, Radiation Measurements, Analytical Chemistry Procedures, Radionuclide Data, EML Special Facilities, and Specifications for Equipment and Supplies. For further information, contact DOE EML at the following: U.S. Department of Energy Environmental Measurements Laboratory, 201 Varick St, 5th Floor, New York, NY 10012-4811 Email: Website: http://www.eml.doe.gov |
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| Brief Method Summary | Radium-226 in solution can be determined by de-emanating its Rn-222 into an ionization chamber or scintillation cell for measurement. The Rn-222 can be de-emanated by bubbling an inert gas through the solution, either after equilibrium has been established or after any known time period. Two half-lives, 7.65 days for example, give 75% of the maximum buildup. |
| Scope and Application | This procedure to determine Radium-226 is specific and may be applied to almost any matrix which can be converted to a homogeneous solution. |
| Applicable Concentration Range | None given. |
| Interferences | Reagent Contamination: Using distilled or organic reagents reduces possible contamination. |
| Quality Control Requirements | Almost all types of samples require simultaneous analysis of reagent blanks, since radium appears in many chemical compounds. Using distilled or organic reagents reduces possible contamination. |
| Sample Handling | The sample with barium carrier should be in homogeneous solution in a volume of 15-25 mL. The solution should be acidic with perchloric acid, neutral or in basic EDTA solution. Hydrochloric acid, NH3 or other volatile materials must be absent. Detailed preparation procedures for separation of radium from sample matrices are presented in other radium procedures in this EML HASL-300 Manual. |
| Maximum Holding Time | None given. |
| Relative Cost |
| Sample Preparation Methods |
This method has 1 analyte associated with it.
| Analyte | DetectionLevel | Bias | Precision | Pct FalsePositive | Pct FalseNegative | SpikingLevel |
Radium-226(13982-63-3) - Actinium-X
- EINECS 231-122-4
- HSDB 2146
- Ra 226
- Ra-226
- Radium, isotope of mass 226
- Radium-225 (TSP)
- Radium-226
- Radon-226
- Thorium-X
| 0.003 Bq/400 min | 90% Yield | 8.20 % RSD (SL) |
| Precision Descriptor Notes: | Precision and accuracy are based on duplicate emanation results. Precision value is calculated from counter background and count time data. |
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| Detection Level Note: | Lower Limit of Detection (LLD) calculated using Pasternack and Harley (1971) procedure in which the smallest amount of sample activity will yield a net count for which there is a confidence at a predetermined level that activity is present. The alpha value utilized is 0.05. |
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| Revision | PDF/Link |
| EML Procedures Manual HASL-300, Volume 1, 28th Ed.(1997) |
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