Radon in housing - a greater environmental problem then expected. Radonhusen storre nuljoproblem an vantat.

Notes that number of houses with radon content exceeding 400 Bq/m*3 is probably far in excess of original estimates. States requirements for new built houses and permitted levels in existing housing. Improved ventilation can reduce risks arising from use of certain building materials now prohibited. Gives details of loans available to combat problem and refers to publication issued by Institute for Radiation Protection on how to assess risk from natural sources and building materials.