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View Actual EPA Method 903.1 (PDF File)
EPA Method 903.1:Radium-226 in Drinking Water. Official Name: Radium-226 in Drinking Water (Radon Emanation Technique)
Summary:The radium-226 in the drinking water sample is concentrated and separated by coprecipitation on barium sulfate. The precipitate is dissolved in EDTA reagent, placed in a sealed bubbler and stored for ingrowth of radon-222. After ingrowth, the gas is purged into a scintillation cell. When the short-lived radon-222 daughters are in equilibrium with the parent (4h), the scintillation cell is counted for alpha activity.
Scope:This method covers the measurement of radium-226 in drinking water samples. This method is specific for radium-226, and is based on the emanation and scintillation counting of radon-222, a daughter product of radium-226.
Citation:Prescribed Procedures for Measurement of Radioactivity in Drinking Water (EPA/600/4-80-032), August, 1980.
Interferences:(1) Voids above the bubbler must be kept very small. (2) Build-up of radon daughter products in the cell. (3) Cell background.
QC Requirements:Not Included
Media:WATER
Subcategory:Radiochemical
Concentration:None given.
Precision:-
Detection:-
Revision Number:Aug-80