Our PET project: an unlimited supply of big and small water sample vials for the assay of radon in water

RAD7 and BigBottle system has been developed, using large glass bottles, but these are fragile and awkward to carry around. In searching for a better solution, we tested polyethylene terephthalate (PET) bottles for water samples storage to estimate radon loss over time.
Two sets of experiments with 0.355 and 1.75 L bottles demonstrated that PET is a suitable material for storage. If correction for 226Ra content in water is applied, we can also calculate the rate of radon loss (0.03 ± 0.08 % day-1).

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