We present a new method to determine 226Ra in aqueous environmental samples, based on the rate of ingrowth of 222Rn from 226Ra, using the radium delayed coincidence counter (RaDeCC). We use the same instrument setup that is used for the determination of 223Ra and 224Ra. In contrast to methods published earlier, the approach does not require a modification of the counting equipment, counting separately for 226Ra, or waiting for radioactive equilibrium.
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