Proposal for a new national radon hazard map - Trøndelag test area - COOP Project
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- Rapporter 
This report describes the work done to produce a radon hazard map for the Trøndelag county. It is our judgement that the techniques and types of data utilized, may also be used for preparation of a new national radon hazard map.Earlier studies, in the Oslo area, have revealed the connection between the indoor radon concentrations and the airborne gamma ray eU (equivalent uranium) map. These studies consider airborne gamma ray survey eU data to be better than mapped geology at accounting for and therefore predicting differences in radon potential across the Oslo area. Based on this connection, we have used the following graduation of eU concentration in the ground (ppm) and radon hazard when introducing a radon map for Trøndelag: eU > 10 ppm is estimated as very high radon hazard, 3-10 ppm is considered high radon hazard, and eU < 3 ppm assumed as moderate to low radon hazard.