DOE EML: Tc-02-RC: Technetium-99 in Water - TEVA Resin
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Official Method Name
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TECHNETIUM-99 IN WATER - TEVA Resin |
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Current Revision
| EML Procedures Manual HASL-300, Volume 1, 28th Ed.(1997) |
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Media
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WATER |
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Instrumentation
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Liquid Scintillation Counting |
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Method Subcategory
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Radiochemical |
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Method Source
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Citation
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Brief Method Summary
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The sample containing Tc-99 is equilibrated with Tc-95m, a gamma-emitting tracer. The technetium is separated from other elements by ferric and ferrous hydroxide precipitation from ammoniacal solutions. The sample is then passed through a commercially available column that selectively extracts Tc(VII) from a 0.1M HNO3 solution. Technetium is purified, eluted from the column and counted directly in a suitable liquid scintillation cocktail. Typically, the sample is counted for 1 h to simultaneously determine Tc-99 activity and the Tc-95m recovery. Quench/efficiency calibration curves need to be established for the liquid scintillation spectrometer for both Tc-95m and Tc-99. |
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Scope and Application
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This procedure determines Tc-99 in water. |
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Applicable Concentration Range
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None given. |
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Interferences
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Cross contamination: High-level and low-level samples should be processed in independent batches to minimize possibility of cross contamination. |
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Quality Control Requirements
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Reagent blanks must be analyzed with each set of samples. High-level and low-level samples should be processed in independent batches to minimize possibility of cross contamination. |
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Sample Handling
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None given. |
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Maximum Holding Time
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None given. |
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Relative Cost
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$51 to $200 |
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Sample Preparation Methods
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