… Before a nationwide survey of radon level, the control value for indoor radon action level
of 400 Bq{center_dot}m{sup -3} for existing houses of our country given by GB/T 16146-1995 …

… national reference levels for indoor radon annual … radon action plan, which should include
promoting action to identify dwellings with radon concentrations exceeding the reference level…

… a nationwide action level provides a constraint to indoor radon exposure (via the action level),
… radon, caused by a large number of dwellings having radon concentrations well below the …

… radon action level be maintained in various indoor environments as part of the law on indoor
… Figure 1 shows how frequently studies on indoor radon concentrations were performed for …

… and powerful tool for examining which preventive or remedial measures should be carried
out to achieve an indoor radon level below the reference level as set by the authorities. …

… concentrations, the arithmetic mean indoor radon level and the prevalence of smoking should
be taken into consideration. In view of the latest scientific data, WHO proposes a reference …

… concentrations in public primary schools located in Porto and to analyse the main factors
affecting indoor radon levels and their variability. In addition, student and teachers’ effective …

… concentration in a model of a typical house, the potential contribution to indoor radon
levels from each source is determined. When these results are compared with reported field …

… their population to indoor radon. Such policies often include a national action level for radon
in … However, most of the world's population lives in areas with low to moderate radon levels …

… The risk is re ported to be pro por tional to the ra don level down to the En vi ron men tal
Pro tec tion Agency (EPA) ac tion level of 0.148 Bq/m3 and prob a bly even be low this level [9, …