MANY CLARE households are getting twice the national average dose of radiation, a survey on the presence of Radon gas in homes has revealed.
The cancer-causing gas was found to be above the safe level in 15 per cent of homes surveyed in Clare in comparison to a national average of 7 per cent of homes.
But, the level found in the Banner county was nowhere near the highest level, which was found in a home in county Kerry, where occupants were being exposed to forty times the safe level of the gas.
The National Survey of Radon in Irish Dwellings was conducted between 1992 and 1999 by the Radiological Protection Institute of Ireland (RPII).
Radon was measured, over a 12month period, in a random selection of houses in each 10 x 10 km National Grid square throughout the country. The results were used to predict the percentage of houses in each grid square in which the radon concentration was in excess of 200 becquerels per cubic metre (Bq/m3), the National Reference Level.
Six of the 1,710 homes surveyed in Clare were found to have more than ten times the safe level of the gas. A total of 1,446 were under the level considered to be safe. 238 homes had levels of between 200 and 999 becquerels and 20 had levels of between 1,000 and 1999
Radon is a naturally occurring radioactive gas which originates from the decay of uranium in rocks and soils. It is colourless, odourless and tasteless and can only be measured using special equipment. When radon surfaces in the open air, it is quickly diluted to harmless concentrations, but when it enters an enclosed space, such as a house or other building, it can cause health problems.
Since July 1998, every new house is required to incorporate some degree of radon preventive measures at the time of construction.
The institute provides a radon measurement service to householders at a price of €50. A radon measurement is usually carried out by placing two small testing devices in the house for a period of three months. The detectors are then returned to the testing laboratory for processing. The procedure is carried out entirely by post. The RPII has produced a set of maps, available on its website, www.rpii.ie, showing high radon areas where more than ten per cent of the houses have levels of the gas above the norm.