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Determination of 222Rn and 226Ra in environmental waters by liquid scintillation counting
AbstractRadon-222 in environmental waters is determined by a procedure where 15 mL of sample is added to 5 mL of toluene-scintillator in a glass vial and radon is extracted into the scintillator. The vials are counted in an inverted position so that the water seals in the radon. The presence of 222Rn supported by 226Ra can be detected by observing growth in a sample which has been nitrogen-purged. The minimum detectable activity is about 0.5 Bq/L. This can be lowered by extracting 100 mL of sample with 20 mL of scintillator and separating the scintillator for counting. Radium-226 in environmental waters and leachates can be determined by coprecipitation of Ra with BaSO4 using 133Ba as a yield tracer, dissolving the BaSO4 in alkaline EDTA and extracting ingrowing 222Rn into toluene-scintillator for counting. Use of 100 mg Ba and limited sulfate permits the analysis of high Ca waters. Tests with 133Ba indicate that the yield of BaSO4 is acceptable and that interference from 133Ba in the counting of Rn can be eliminated by raising the energy threshold of the Rn channel.
Determination of 222Rn and 226Ra in environmental waters by liquid scintillation counting
AbstractRadon-222 in environmental waters is determined by a procedure where 15 mL of sample is added to 5 mL of toluene-scintillator in a glass vial and radon is extracted into the scintillator. The vials are counted in an inverted position so that the water seals in the radon. The presence of 222Rn supported by 226Ra can be detected by observing growth in a sample which has been nitrogen-purged. The minimum detectable activity is about 0.5 Bq/L. This can be lowered by extracting 100 mL of sample with 20 mL of scintillator and separating the scintillator for counting. Radium-226 in environmental waters and leachates can be determined by coprecipitation of Ra with BaSO4 using 133Ba as a yield tracer, dissolving the BaSO4 in alkaline EDTA and extracting ingrowing 222Rn into toluene-scintillator for counting. Use of 100 mg Ba and limited sulfate permits the analysis of high Ca waters. Tests with 133Ba indicate that the yield of BaSO4 is acceptable and that interference from 133Ba in the counting of Rn can be eliminated by raising the energy threshold of the Rn channel.
Determination of 222Rn and 226Ra in environmental waters by liquid scintillation counting
Cooper, E.L. (author) / Brown, R.M. (author) / Milton, G.M. (author)
Environmental International ; 14 ; 335-340
1988-08-24
6 pages
Article (Journal)
Electronic Resource
English
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