|Radioisotopes||228Th, 230Th, 232Th|
This method specifies the minimum requirements and laboratory methods for measuring 228Th, 230Th and 232Th in river water and coastal seawater with high thorium contents.
River- and sea-water samples are collected in acid-cleaned containers and pre-treated on board, by filtrating, acidifying and co-precipitating. Post processing is conducted in the land laboratory by purifying Th isotopes via anion-exchange column. Thorium isotopes are finally measured by alpha spectrometry.
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