The removal of radon from CO2 for use in14C age measurements
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It is shown that traces of radon can be extracted from carbon dioxyde by pumping off from solid CO2. Since the volatility of radon is smaller than the volatility of CO2, special care has to be taken during condensation in order to avoid occlusion. Enrichment of radon at the wall where the CO2 condenses is avoided by stirring the gas. An estimate of the fraction of radon, adsorbed on the wall, demonstrates the necessity of performing the condensation at about 80°C. At 180°C the greater part of the radon is adsorbed; consequently it is occluded if CO2 is added. The method can be used only in those cases where the volatility of the contaminant is not too much lower than of CO2, and where the molecules of the contaminant do not fit well into the lattice of solid CO2. The present purification is much faster than the chemical purification described previously1)2).
KeywordsRadon Radon Concentration Central Tube Vacuum Line Chemical Purification
- 2).Vries, HI. de, Appl. Sci. Res.B5 (1955) 387.Google Scholar
- 3).Volmer, M., Kinetik der Phasenbildung, Steinkopf 1939.Google Scholar
- 4).Cabrera, N. and W. K. Burton, Disc. Far. Soc. No. 5, 1949 page 47.Google Scholar
- 5).Boer, J. H. de, The dynamical character of adsorption, Oxford Univ. Press 1953.Google Scholar