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A comparison on commercially available radon (222Rn) measuring instruments (three types of continuous monitors and a passive 222Rn-thoron (220Rn) discriminative alpha track detector) was carried out at low-level concentrations in one room of a concrete building. The agreements between the continuous monitors were within 15%, while the agreements between each instrument were within 20%. It was also observed that the indoor 220Rn concentration measured by the continuous monitor was quite different from those by the passive detectors due to