Determination of the Radium Content of Rocks
- 1 January 1936
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 4 (1), 40-48
- https://doi.org/10.1063/1.1749745
Abstract
The determination of the age of common rocks by the ``helium method'' necessitates accurate measurements of the radium content. The method of compensating the background by the use of two opposed ionization chambers is applied to radium determinations and the apparatus has an observational limit of 5.5×10—14×n—½ g radium for n hourly readings. With the thorium content determined as in the preceding article a summary of results for a suite of rocks from a single horizon and the present status of a geological time scale is given.Keywords
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