Messung des Tritium-Jahresganges im Regen 1960-61 nach Isotopenanreicherung im Trennrohr1

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Abstract
The tritium content in rain-water collected near Cologne (Germany) varied in 1960 — 61 between 20 — 200 T.U. with the maximum in May and the minimum in November. A striking parallelism to variation of Sr-90 in rain is found. — About 10 ml of rain-water are reduced by magnesium. The tritium is quantitatively enriched by a CLUSIUS—DICKEL-column in 24 hours. A tenfold electrolytical enrichment is done beforehand when measuring tritium concentrations less than 20 T.U. The performance of the CD-column is found to be in good agreement with theory. The activity is measured by an argon-methane filled proportional counter, whose background is reduced by energy discrimination.