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IEC 61577-6:2026 Describes the specific requirements for instruments measuring the
exposure to airborne radon (222Rn) outdoors and indoors. The exposure is the time-integrated
radon activity concentration in air accumulated over the exposure period.
This document applies to radon integration measurement systems equipped with solid-state
nuclear track detectors (SSNTD) installed in an enclosed volume. The air containing 222Rn
enters the volume by diffusion.