Programas de radón en Programas de radón en Irlanda Irlanda David Fenton David Fenton Radiological Protection Institute Radiological Protection Institute of Ireland of Ireland Universidade de Santiago Universidade de Santiago de Compostela de Compostela 26 June 2003 26 June 2003
27
Embed
Programas de radón en Irlanda David Fenton Radiological Protection Institute of Ireland Universidade de Santiago de Compostela 26 June 2003.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Programas de radón en Programas de radón en IrlandaIrlanda
David FentonDavid FentonRadiological Protection Institute of IrelandRadiological Protection Institute of Ireland
Universidade de Santiago Universidade de Santiago de Compostelade Compostela
26 June 200326 June 2003
Programas de radón en Programas de radón en IrlandaIrlanda
•Vivienas / La Encuesta Nacional Irlandesa
•Colegios
•Puestos de Trabjo
Structure of Presentation
•Review of RPII
•Historical Notes
•National Survey
•Workplaces
•Homes
•Schools
THE RADIOLOGICAL PROTECTIONTHE RADIOLOGICAL PROTECTIONINSTITUTE OF IRELANDINSTITUTE OF IRELAND
•1990:1990: Domestic Reference Level adoptedDomestic Reference Level adopted200 Bqm200 Bqm-3 -3 – long term whole house average. – long term whole house average.
•1992: 1992: National Geographically basedNational Geographically based
Radon Survey CommencedRadon Survey Commenced
Level at Which Householders are Level at Which Householders are Advised to Consider Remedial ActionAdvised to Consider Remedial Action
La Encuesta Nacional Irlandesa
La Encuesta Nacional Irlandesa
•Survey Carried out 1990’sSurvey Carried out 1990’s
•Survey Published in 2002Survey Published in 2002
• Identify Areas at Greatest Risk• Survey Results incorporated into Building Regulation-Technical Guidance Documents (Dept of Environment)• Included in legislation implementing BSS directive
Radon Mapping Technique Used in Ireland
A Radon Prediction Map was produced by the RPII by Modelling the Distribution of Indoor Radon Concentrations
Determination of the Indoor Radon Distribution in Ireland
• National Geographical Based Radon Survey Was Conducted over 7 Years
• Houses Selected at Random From Every 10 km Grid Square in the Country
• A minimum of 5 houses per 10 km Grid Square was Required
•Land mass of Ireland covers Eight Hundred and Thirty Two 10 km Grid Squares
• Radon Measurements Over 12 Months were carried out in 11,319 Houses
• Indoor Radon Levels in Irish Houses Follow a Log-Normal Distribution
Methodology Used for Estimating the Proportion of Houses in Excess of a
Given Reference Level
• Calculate the Geometric Mean (GM) and the Geometric Standard Deviation (GSD) for Each 10 Km Grid Square
• Estimate the Proportion of Houses in Each 10 Km Grid Square using the Formula
k = ln(200ref)-ln(GM)/ln(GSD)where k is a transformed threshold for use with the standard normal distribution
• Once k is Known, the Proportion of Houses in Excess of the Stated Reference Level is Obtained from Statistical Tables of the Area Under the Standardised Curve
Methodology Adopted in Situations Where Insufficient Data Was Obtained in 10 Km
Grid Squares
• Used a Smoothing Technique to Obtain representative Values of both GM and GSD
• This Smoothing Technique Uses the Available Data in the 10 Km Grid Square and the Data in Surrounding Grid Squares
• The Department of the Environment and Local Government has issued Building Regulations (1998) and Technical Guidance Documents on Radon preventative measures to be followed when Constructing New Buildings
• The Prediction Radon Map of Ireland is Incorporated into national regulations