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Dáil Éireann díospóireacht -
Wednesday, 16 Feb 1994

Vol. 438 No. 8

Written Answers. - Radon Gas Measurements.

Edward Nealon

Ceist:

104 Mr. Nealon asked the Minister for Transport, Energy and Communications if his attention has been drawn to the fact that an assessment in 1992 of 63 primary schools in County Sligo by the Radiological Protection Institute of Ireland indicated that over half these schools had radon levels above the reference of 150 becquerels per cubic metre, while in other areas where similar assessments were carried out, only one-twentieth of the schools were above the reference level; that in a population-weighted survey of houses in County Sligo organised by the Physics Department of UCG the average radon levels recorded were twice the national average, with one house recording 1,342 becquerels per cubic metre of air as compared with a reference level of 200 above which the need for remedial action should be considered; that, in all, 16 per cent of the 25 houses where measurements were taken in County Sligo were above the 200 reference level; if, in view of all these findings in the limited surveys to date clearly indicating very significant radon levels right throughout County Sligo with the danger to health implicit in this and with obvious need for remedial action to be taken in houses as is now being undertaken in the schools surveyed, he will consider some special scheme or initiative which would lead to a general scheme of measurement for radon being undertaken and promoted for the county; and if he will make a statement on the matter.

At the request of the Department of Education the Radiological Protection Institute of Ireland offered free radon measurements to all primary and secondary schools in County Sligo. This work was completed in June 1993. All of the results are now available and these show that remediation work to reduce radon concentrations below the 150 Bq/m³ Reference Level for schools is necessary in one or more classrooms in 33 of the 62 primary schools and 10 of the 15 secondary schools surveyed. The Department of Education was advised of the result and I understand that work is already in hand to reduce radon concentrations in these schools.

The population-weighted survey, carried out by University College Dublin (not UCG) in the years 1984-1988 involved measurements of 25 houses. The mean value was 118 Bq/m³, with a range of 6-1342 Bq/m³. The median value was 43 Bq/m³, compared with a national figure of 34 Bq/m³.

In June 1992 the Radiological Protection Institute of Ireland initiated a national geographical survey to compile data on radon measurements throughout Ireland. Results will be compiled on the basis of the 10 × 10 km National Grid with a view to identifying areas at greatest risk from high radon levels. On the basis of existing information County Sligo was identified as one of the priority areas for surveying.
At present radon measurements are taking place, or will soon commence, in over 260 homes throughout County Sligo. Because the measurement period is 12 months, final results are not expected before 1995 and only at that time will it be possible to identify the areas at greatest risk and in which radon preventive measures may be desirable in all future housing.
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