commiss recommend decemb protect public exposur radon drink water suppli notifi document number euratom commiss european commun regard treati establish european atom energi commun articl paragraph articl paragraph articl indent articl thereof regard opinion group expert appoint scientif technic committe pursuant articl treati council direct euratom lai basic safeti standard protect health worker gener public danger aris ionis radiat lai framework control exposur natur radiat sourc aris work activ titl vii direct appli work activ presenc natur radiat sourc lead signific increas exposur worker member public member state requir identifi work activ concern view larg geograph variabl natur occurr radon extent popul water suppli affect flexibl approach need member state appli concept optimis ensur protect highli expos part popul approach accord articl direct euratom group expert set articl euratom treati provid technic guidanc implement titl vii direct euratom guidanc includ protect worker inhal radon establish signific amount radon releas water indoor air commiss recommend euratom februari protect public indoor exposur radon introduc refer design level indoor radon refer level consider remedi action bq design level futur construct bq survei member state shown elev concentr radon ground water region crystallin rock circumst radon concentr drink water radiolog signific expos popul enhanc dose disregard radiat protect point view high concentr relat individu drill well waterwork utilis rock soil aquif member state increas awar signific exposur popul radon drink water countri draw dose control polici case control polici drawn accord protect principl establish council direct euratom ec novemb qualiti water intend human consumpt radon natur occur radioact nobl ga signific isotop radon half life dai isotop member uranium decai seri presenc environ trace amount parent radium rock soil radon inert ga move freeli porou media soil fragment rock pore satur water soil rock water tabl radon dissolv water transport water satur soil poros radium concentr bq kg world wide averag earth crust equilibrium radon concentr ground water order bq survei member state shown radon concentr surfac water low bq concentr ground water vari bq rock aquif sedimentari rock bq well dug soil bq bq crystallin rock highest concentr high uranium concentr bedrock characterist radon concentr rock aquif variabl region fairli uniform rock type well exhibit concentr averag region signific season variat concentr observ radon domest water suppli human exposur ingest inhal pathwai radon ingest direct consumpt tap fresh bottl water radon releas tap water indoor air exposur radon inhal report unit nation scientif committe effect atom radiat unscear estim commit effect dose ingest radon water sv bq adult higher child infant nation research council committe unit state present convers factor sv bq committe find suffici scientif evid introduc separ dose estim ag group addit convers factor ingest dose depend annual consumpt water estim annual commit effect dose absorb adult ingest water bq vari msv msv depend annual water consumpt rang convers factor increas indoor radon concentr caus tap water depend paramet total consumpt water hous volum hous ventil rate unscear nation research council estim bq radon tap water averag increas indoor air radon concentr bq radon drink water control physic engin sens effect method remov radon drink water develop commerci system establish reduc signific exposur import part system adopt refer level consider remedi prevent action method equip remov radon long live radon decai product water significantli differ techniqu cost exist water suppli suppli plan futur criteria includ refer level remedi action exist water suppli set prevent requir water suppli individu water suppli water suppli part commerci public activ exposur caus radon water phenomenon fairli similar radon dwell similar radiolog protect criteria appli ingest inhal pathwai annual effect dose caus water bq radon current knowledg compar caus indoor radon concentr bq design level establish recommend euratom water suppli part commerci public activ waterwork consum opportun control receiv dose owner individu suppli consum confid water pose risk human health addit remedi action water affect larg number peopl make action cost effect lower radon concentr case individu suppli justifi adopt stringent control polici includ lower refer level water suppli part commerci public activ individu suppli small amount radon water ubiquit remedi action requir concentr bq nation survei show higher refer level adopt implement practic radon programm public commerci distribut water radon concentr exceed bq consid justifi radiat protect point view radon concentr water point deliveri greater sourc case waterwork measur sourc suffici demonstr complianc refer concentr separ measur need point radioact decai aerat radon deliveri account assess dose direct ec requir member state monitor concentr natur radionuclid drink water addit radon radon decai product exclud scope direct circumst polonium lead long live decai product radon drink water pose compar higher radiat risk natur radionuclid monitor accord direct polonium lead disregard monitor take action reduc exposur caus natur radionuclid drink water refer concentr polonium lead establish monitor principl set natur radionuclid direct indic dose msv principl dose calcul establish direct deriv refer concentr high radon concentr potenti presenc radionuclid uranium decai seri water correl unambigu remedi action reduc radon concentr presenc natur radionuclid screen analys detail suitabl techniqu chosen remov radiolog signific natur radionuclid water time cost effect specif guidanc made waterwork owner public water suppli method remov radon long live radon decai product water guidanc includ instruct handl dispos accru radioact wast wai minimis exposur due radon releas remov devic increas extern gamma radiat vicin remov devic simpl metrolog procedur establish ensur measur radon radon decai product water yield data qualiti reliabl ow special characterist problem adequ public inform import element improv control exposur secur posit public respons purpos recommend provid guidanc member state set control exposur caus radon radon decai product drink water recommend recommend concern radiolog qualiti drink water suppli radon long live radon decai product system establish reduc exposur radon long live radon decai product domest drink water suppli system adequ public inform respons public concern deserv attent system attent concentr highest exposur area action effect purpos recommend quot drink water quot water origin state treatment intend drink cook food prepar domest purpos origin suppli distribut network tanker bottl contain water food product undertak manufactur process preserv market product substanc intend human consumpt compet nation author satisfi qualiti water affect wholesom foodstuff finish form natur miner water cover council direct eec water medic product council direct eec exclud scope recommend special rule type water establish repres survei undertaken determin scale natur exposur caus radon long live radon decai product domest drink water suppli origin type ground water sourc well geolog area inform survei design underli paramet geologi hydrolog area radioact rock soil type identifi direct action highest exposur survei cover drill well crystallin rock area waterwork rock soil aquif water suppli part commerci public activ action concentr bq member state set refer level radon consider remedi action need protect human health level higher bq adopt nation survei show implement practic radon programm concentr excess bq remedi action deem justifi radiolog protect ground measur radon concentr requir specif reason suspect basi result repres survei reliabl inform refer level exceed signific concentr polonium lead suspect basi result repres survei reliabl inform monitor nuclid arrang conjunct monitor natur radionuclid requir direct ec refer concentr bq polonium bq lead consider remedi action need protect human health individu water suppli water suppli part commerci public activ action level bq consider remedi action urgenc remedi action commensur extent refer concentr exceed remedi action consid radon level natur radionuclid screen result screen natur radionuclid analys remov drink water remedi action remedi action consid consum concern inform radon level water remedi reduc level measur radon tap water contribut significantli exceed threshold set indoor radon remedi action sourc consid drink water distribut public premis residenti home school hospit compli principl point measur made method equip undergon approv calibr qualiti assur programm member state provid guidanc method remov radon long live radon decai product water member state provid instruct handl dispos radioact wast gener remov process wai minimis exposur caus radon releas remov devic increas extern gamma radiat vicin remov devic exposur worker inhal radon establish signific amount radon releas water indoor air waterwork spa swim pool control titl vii direct euratom recommend quot radiat protect quot made implement titl group expert establish articl euratom treati member state extent intent radon bear water prospect therapeut effect justifi econom social benefit set health detriment recommend address member state brussel decemb commiss margot wallström member commiss oj radiat protect recommend implement titl vii european basic safeti standard direct bss signific increas exposur due natur radiat sourc european commiss luxembourg oj oj oj unscear report sourc effect ionis radiat unit nation scientif committe effect atom radiat york risk assess radon drink water committe risk assess exposur radon drink water board radiat effect research commiss life scienc nrc nation research council nation academi press washington dc commiss fund fund research project risk exposur radon tenewa project treatment techniqu remov natur radionuclid drink water carri cec contract fi pct produc signific amount inform remov techniqu includ inform radiolog hazard caus remov devic oj oj special edit