Abstract
The Radiation and Nuclear Safety Authority has measured the radon concentration of indoor air in 87 000 Finnish houses and 5 000 apartments in blocks of flats. The average value of the radon concentration in the buildings measured is shown in national maps in 10 x 10 km squares and, for houses also in regional maps in 5 x 5 km squares. In the measurements, 11 000 dwellings were found with a radon concentration higher than the maximum permitted value of 400 Bq /m3. 28 000 dwellings were found to exceed the maximum permitted value for new houses of 200 Bq /m3. The proportion of houses exceeding the maximum permitted values is shown by municipality. The maps also illustrate the connection between radon concentration and the time of construction of houses, the type of soil they have been built on and the type of foundation. Radon concentrations are highest in the area comprising the regions of Itae-Uusimaa, Paeijaet-Haeme, Kymenlaakso, Kanta-Haeme, Pirkanmaa and South Karelia. In these regions, more than 30% of houses measured exceeded 200 Bq /m3. Proportionately more radon measurements were carried out in the region of Itae-Uusimaa, where 17.9% of all houses were measured. In newer houses built
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Citation Formats
Valmari, T, Maekelaeinen, I, Reisbacka, H, and Arvela, H.
Radon Atlas of Finland 2010; Suomen radonkartasto 2010.
Finland: N. p.,
2010.
Web.
Valmari, T, Maekelaeinen, I, Reisbacka, H, & Arvela, H.
Radon Atlas of Finland 2010; Suomen radonkartasto 2010.
Finland.
Valmari, T, Maekelaeinen, I, Reisbacka, H, and Arvela, H.
2010.
"Radon Atlas of Finland 2010; Suomen radonkartasto 2010."
Finland.
@misc{etde_1010743,
title = {Radon Atlas of Finland 2010; Suomen radonkartasto 2010}
author = {Valmari, T, Maekelaeinen, I, Reisbacka, H, and Arvela, H}
abstractNote = {The Radiation and Nuclear Safety Authority has measured the radon concentration of indoor air in 87 000 Finnish houses and 5 000 apartments in blocks of flats. The average value of the radon concentration in the buildings measured is shown in national maps in 10 x 10 km squares and, for houses also in regional maps in 5 x 5 km squares. In the measurements, 11 000 dwellings were found with a radon concentration higher than the maximum permitted value of 400 Bq /m3. 28 000 dwellings were found to exceed the maximum permitted value for new houses of 200 Bq /m3. The proportion of houses exceeding the maximum permitted values is shown by municipality. The maps also illustrate the connection between radon concentration and the time of construction of houses, the type of soil they have been built on and the type of foundation. Radon concentrations are highest in the area comprising the regions of Itae-Uusimaa, Paeijaet-Haeme, Kymenlaakso, Kanta-Haeme, Pirkanmaa and South Karelia. In these regions, more than 30% of houses measured exceeded 200 Bq /m3. Proportionately more radon measurements were carried out in the region of Itae-Uusimaa, where 17.9% of all houses were measured. In newer houses built since the turn of the millennium, radon concentrations were on average less than in houses built in the 1980s and 90s. Radon measurements were carried out most where levels are high. Regionally representative estimates of parameters to depict the radon situation in houses were determined by calculating their values in 1 km-squares, and by weighting the result in each square by the number of houses that it contained. On the basis of the measurement data, the average value for radon concentration in Finnish houses is 142 Bq /m3, the proportion of houses exceeding 200 Bq /m3 is 17.4% and the proportion of houses exceeding 400 Bq /m3 is 5.3%. These values are to some extent higher than the results obtained in a national sampling survey carried out in 2006 (121 Bq /m3, 15.1%, 3.8%). In the upper floors of blocks of flats, the radon concentrations are usually low. On the other hand, high levels are common in apartments on the lowest floor when the apartment has no cellar or other kind of room under it, and the ground slab sits directly on top of a gravel layer. (orig.)}
place = {Finland}
year = {2010}
month = {Aug}
}
title = {Radon Atlas of Finland 2010; Suomen radonkartasto 2010}
author = {Valmari, T, Maekelaeinen, I, Reisbacka, H, and Arvela, H}
abstractNote = {The Radiation and Nuclear Safety Authority has measured the radon concentration of indoor air in 87 000 Finnish houses and 5 000 apartments in blocks of flats. The average value of the radon concentration in the buildings measured is shown in national maps in 10 x 10 km squares and, for houses also in regional maps in 5 x 5 km squares. In the measurements, 11 000 dwellings were found with a radon concentration higher than the maximum permitted value of 400 Bq /m3. 28 000 dwellings were found to exceed the maximum permitted value for new houses of 200 Bq /m3. The proportion of houses exceeding the maximum permitted values is shown by municipality. The maps also illustrate the connection between radon concentration and the time of construction of houses, the type of soil they have been built on and the type of foundation. Radon concentrations are highest in the area comprising the regions of Itae-Uusimaa, Paeijaet-Haeme, Kymenlaakso, Kanta-Haeme, Pirkanmaa and South Karelia. In these regions, more than 30% of houses measured exceeded 200 Bq /m3. Proportionately more radon measurements were carried out in the region of Itae-Uusimaa, where 17.9% of all houses were measured. In newer houses built since the turn of the millennium, radon concentrations were on average less than in houses built in the 1980s and 90s. Radon measurements were carried out most where levels are high. Regionally representative estimates of parameters to depict the radon situation in houses were determined by calculating their values in 1 km-squares, and by weighting the result in each square by the number of houses that it contained. On the basis of the measurement data, the average value for radon concentration in Finnish houses is 142 Bq /m3, the proportion of houses exceeding 200 Bq /m3 is 17.4% and the proportion of houses exceeding 400 Bq /m3 is 5.3%. These values are to some extent higher than the results obtained in a national sampling survey carried out in 2006 (121 Bq /m3, 15.1%, 3.8%). In the upper floors of blocks of flats, the radon concentrations are usually low. On the other hand, high levels are common in apartments on the lowest floor when the apartment has no cellar or other kind of room under it, and the ground slab sits directly on top of a gravel layer. (orig.)}
place = {Finland}
year = {2010}
month = {Aug}
}