On the isotopic constitution of radium (Ra‐224/Ra‐226 and Ra‐228/Ra‐226) in petroleum brines

Abstract
The relative amounts of Ra‐224, Ra‐226, and Ra‐228 in a number of petroleum brine samples from Oklahoma and northwestern Arkansas have been determined. The highest concentration found was more than one millimicrocurie/liter of brine. Some brines contained radium isotopes characteristic of the thorium series, others contained Ra‐226 which is characteristic of the uranium series, while others contained radium from both the thorium and uranium series. The radium isotopes in the brines are not in radioactive equilibrium with their uranium and thorium parents.

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