Table 1.

Reported quality assurance and quality control of radon and/or radon decay products measurements during the indoor radon surveys.

Country	Periodical calibration (or accreditation ISO 17025)	Intercalibration and intercomparison	Comparison of the results from different detector systems	Duplicate detectors	None
Albania				x
Austria		x	X
Azerbaijan					x
Belarus					x
Belgium		x
Bosnia and Herzegovina					x
Bulgaria					x
Croatia					x
Cyprus	x		X
Czech Republic	x
Denmark					x
Estonia					x
Finland					x
France		x
Georgia					x
Germany	x
Greece	x
Hungary	x
Iceland					x
Ireland	x			x
Italy	x	x
Kazakhstan					x
Latvia					x
Lithuania		x
Luxembourg					x
Macedonia	x
Malta	x
Moldova					x
Montenegro			X	x
Netherlands			X
Norway		x
Poland		x
Portugal				x
Romania		x
Russia	x		X
Serbia					x
Slovakia	x
Slovenia	x	x
Spain		x
Sweden	x
Switzerland					x
Turkey	x	x
Ukraine	x	x
United Kingdom		x