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- W2302002145 abstract "A radio-release procedure for the determination of minute quantities of water vapor in gases was investigated. The gas containing water vapor was passed through a column of radioactive calcium carbide (Ca/sup 14/C/sub 2/). The acetylene (/sup 14/C/sub 2/H/sub 2/) generated from the chemical reaction then passed over a Geiger-Mueller counter whereupon the count-rate was a direct measure of the water vapor content of the original gas. The ultimate sensitivity of the reaction assuming a 1% counting efficiency, a counting cell of 1 ml volume, and the highest specific activity Ca/sup 14/C/sub 2/ available being 10 mc/millimole, was calculated to be about 0.4 microns partial pressure of water vapor in the gas. This sensitivity was not achieved because the Ca/sup 14/C/sub 2/ contained gross amounts of unreacted calcium and barium metal impurities, together with an unknown amount of CaO and Ca(OH)/sub 2/. All of these perturb the reaction, especially since the material is inhomogeneous. A further limitation is the formation of Ca(OH)/sub 2/ and/or CaO on the surface of the Ca/ sup 14/C/sub 2/ particles which impedes reaction as the coating builds up. Whereas the latter limitation (build-up of Ca(OH)/sub 2/ surface coating) can probably be overcome, the problem of preparationmore » of pure Ca/sup 14/C/sub 2/ is a serious one. Therefore, the research was stopped. (auth)« less" @default.
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- W2302002145 date "1964-01-31" @default.
- W2302002145 modified "2023-09-26" @default.
- W2302002145 title "A RADIO-RELEASE TECHNIQUE FOR THE MEASUREMENT OF MOISTURE IN GASES. Final Report" @default.
- W2302002145 hasPublicationYear "1964" @default.
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