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- W2069663043 abstract "The measurement of the abundance of tritium in natural waters has been continued during the last eighteen months. The method used consists of the electrolytic concentration of the water samples, the measurement of the deuterium concentration in the final product from which the enrichment factor for any tritium present in the original sample can be calculated, followed by the determination of the tritium content of the concentrate by placing it as gaseous hydrogen in a Geiger counter. It is shown that the data are in agreement with an average cosmic-ray production rate of about 0·14 tritium atoms per cm2 per second of the earth's surface, on the assumption that essentially all of this tritium passes into water without decaying into helium and the tritiated water is precipitated out and goes into the sea. The average tritium content of oceanic rain appears to be about 1 tritium atom per 1018 hydrogen atoms, whereas the continental rains have higher assays. The great Mississippi Valley shows about 6. The western coast of Europe runs about 2·5. The ocean surface waters have about one-fifth the tritium content of ocean rain. This means that the ocean mixes to only an average depth of 100 metres in 18 years—the average life of tritium. Several hot springs have been tested and most found to be rain water. Tests on wells agreed with expectations. As yet there is no significant meteorological understanding of the erratic fluctuations in the tritium assays for rain in a given location. It probably is due to variation in air-mass trajectories, origins, and water contents." @default.
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- W2069663043 date "1955-03-01" @default.
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- W2069663043 title "Natural distribution of cosmic-ray produced tritium. II" @default.
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- W2069663043 doi "https://doi.org/10.1016/0022-1902(55)80070-x" @default.
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