Direct Determination of the Individual Concentrations of Radon Daughter Products in the Atmosphere by the Means of Delayed Coincidence Technique
The apparatus consists of a sampling head to hold an air filter mounted directly over a CsI(Tl) scintillation counter. The radioactivity on the air-filter is measured throughout the sampling period. By means of a pulse shape discrimination technique, the alpha pulses are discriminated against beta pulses. The count rate of 214Bi-214Po pair is determined by the beta-alpha delayed coincidence method, and the contribution of 218Po and 214Pb to the total activity can be determined by subtracting a constant ratio of this coincidence rate. Finally, the growth curves of the individual activities of the daughters are recorded by a multichannel counting rate meter. The degree of equilibrium between radon and its daughters in the atmosphere is determined accurately in short time intervals.
KeywordsRadon Geophysics Plutonium
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