Abstract
A simple and reliable method for the determination of 222Rn concentration in natural water using a liquid scintillation counting technique was investigated.Water sample (50ml) containing 222Rn was directly mixed into emulsive liquid scintillator (50 ml), followed by the spectrometric measurements by a multichannel pulse height analyzer coupled to a low background liquid scintillation counter.Weak quenching effect due to the increase of water fraction and the ionic constituents did not bother the determination of low-level 222Rn concentration because the liquid scintillationspectrometry could easily distinguish the alphaparticle spectrum even in quenched samples. Since the present procedure is not necessary for the correction of the recovery yield of 222Rn, the experimental error included is very small in comparison with the widespread extraction method of 222Rn with organic solvent. The detection limit of 222Rn concentration was estimated to be about 74 mBq/l (triple the standard deviation of background counting) in a fixed counting time of 100 min.
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