Abstract
The distribution of radon between the supernatant gas and the two-phase solution in an emulsion-scintillator system has been measured experimentally. Effective distribution coefficients for radon are described as a function of emulsion composition. Under conditions routinely attainable with conventional liquid-scintillation counters, a count rate of 10.4 min −1/pCi of 222Rn in equilibrium with short-lived daughters is observed. A 226Ra concentration ⩾0.1 pCi/ml in biological samples containing comparable concentrations of other radionuclides can be determined indirectly by monitoring the in situ growth of radon activity in samples initially purged of radon. A prototype system based on the “isopiestic method” of solution thermodynamics is described for conventional liquid-scintillation detection of radium concentrations in the range of 1 pCi/l. The distribution coefficients for xenon are described also as a function of emulsion-scintillator composition.
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