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Markradonrisk i Skara kommun. Informationen är sammanställd av Samhällsbyggnadskontoret 2004. Kommunen delas in in områden med hög, normal eller låg risk för markradon. Avgränsningar bygger på kända geologiska förhållanden och mätningar i hus. Den ger ingen heltäckande information och gränserna kan vara osäkra, särskilt i glest bebyggda områden. I tveksamma fall bör särskild markundersökning göras före byggnation. <\/SPAN><\/P>

Bakgrund: Ett av Billingens många bergartslager är radiumhaltigt alunskiffer, vilket sliptas till grus och sand under nedisningarna och har sedan spritts i landskapet väster om berget, s.k. Vallemorän. I vissa fall har även radonhaltigt utfyllnadsmaterial, t.ex. blåbetong tillförts vid grundläggning vilket påverkat förekomst av radon. <\/SPAN><\/P>

Högriskområden: E och H. Dessa består av alunskifferhaltig Vallemorän och utgör högriskmark. Områdets gräns mot Billingen är klart definierad, medan den västra är betydligt osäkrare. En zon med omväxlande höga och låga värden kan finnas på båda sidor om gränsen mot D och G. <\/SPAN><\/P>

N<\/SPAN>ormalriskområden: B, C, D, F. Område B innehåller fin sand varvad med lera, medan område C huvudsakligen innehåller lera. Område D kan, eftersom det är en mosaik av olika geologiska bildningar, lokalt innehålla höga radonhalter. I område F kan höga varden lokalt uppmomma om radon från underliggande alunskifferskikt leds uppåt via sprickor.<\/SPAN><\/P>

Lågriskområden: A, G. Område A innehåller mäktiga lerlager. Område G utgörs av hårt packad morän med berg i dagen. 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