EPA Method 903.1


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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

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