A method is described for measuring the radium content of natural waters. The method is shown to be accurate to within a few percent for concentrations as low as 100times;10minus;12g Ra per liter. Results are given of measurements on several connate waters from midhyphen;continent oil fields. A correlation between radium and calcium content of the waters is indicated. Samples taken from the same wells over a period of several months indicate that the radium concentration is a definite property of a connate water.
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