commiss recommend februari protect public indoor exposur radon euratom commiss european commun regard treati establish european atom energi commun articl paragraph thereof consult group expert appoint scientif technic committe pursuant articl treati member state increas awar signific indoor exposur popul radon countri draw dose control polici task commiss harmon member state provis applic basic safeti standard health protect gener public danger aris ioniz radiat commiss ask group expert set term articl treati examin problem draw propos action group report commiss present recommend base report prejudic commiss ongo work develop global approach problem indoor pollut ii radon natur occur radioact ga signific isotop radon half life dai member uranium decai seri presenc environ trace amount parent radium rock soil major contributor radon concentr dwell soil ga enter indoor air space floor pressur driven concentr driven flow countri contribut build materi special case minor comparison recent survei member state shown averag concentr indoor bq typic outdoor valu order magnitud lower compar form natur radiat chief characterist indoor radon level variabl countri dwell exhibit radon level order magnitud averag dose inhal radon ga low comparison short live radioact daughter isotop polonium lead bismuth inhal deposit surfac human respiratori tract signific dose aris alpha irradi bronchial epithelium task group intern commiss radiolog protect icrp set studi lung cancer risk indoor exposur radon daughter report dose basi current exposur model impli convers coeffici bq msv year time averag activ concentr radon ga annual effect dose equival indoor exposur member public typic annual dose dwell commun lie rang msv small percentag popul countri receiv msv year comparison current annual dose limit exposur member public man made radiat laid commun basic safeti standard msv exposur radon phenomenon epidemiolog studi group minor expos elev concentr work reveal excess lung cancer death present firm evid effect indoor radon exposur gener public evid appear prudent commiss make recommend limit exposur icrp note indoor radon control physic engin sens criteria radiolog safeti develop practic guidelin remedi action exist build futur build prevent measur requir base design construct specif prevent approach justifi adopt design level lower refer level remedi action exist build simpl metrolog procedur establish ensur measur indoor radon yield data qualiti reliabl promot control exposur indoor radon commun articl group expert drew detail guidanc incorpor present recommend consist guidanc provid icrp achiev pratic sens final mention due special characterist problem adequ public inform import element improv control exposur assur posit public respons recommend system establish reduc exposur indoor radon concentr system adequ public inform respons public concern deserv attent exist build refer level consider remedi action exceed consider simpl effect measur aim reduc radon level refer level effect dose equival msv annum practic purpos equival annual averag radon ga concentr bq urgenc remedi action account extent refer level exceed remedi action consid public concern inform radon level expos remedi reduc level futur construct design level aid relev author establish regul standard code construct practic circumst design level exceed design level effect dose equival msv annum practic purpos equival annual averag radon ga concentr bq inform provid involv construct build relev radon exposur level prevent measur remedi prevent measur determin principl optim appli accord commun basic safeti standard diurnal season variat indoor radon level radiat protect decis gener base annual averag measur radon ga daughter affect build integr techniqu compet author ensur qualiti reliabl measur adequ criteria develop identifi region site build characterist high indoor radon level investig level underli paramet activ soil build materi permeabl ground identifi exposur circumst recommand address member state brussel februari commiss carlo ripa di meana member commiss lung cancer risk indoor exposur radon daughter annal icrp vol public pergamon press council direct euratom juli amend direct lai basic safeti standard health protect gener public worker danger ioniz radiat oj principl limit exposur public natur sourc radiat annal icrp vol public pergamon press commiss commun implement council direct euratom juli amend direct lai basic safeti standard health protect gener public worker danger ioniz radiat euratom septemb amend direct euratom oj