LoginThis paper presents a history of the development of a formalized training and technology transferprogram for radon testers and mitigators in the United States.
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First, models (room models) published in the international literature allowing the exposure togamma radiation indoors due to building materials to be assessed are reviewed and discussed.
Within the Belgian Radon Programme the Belgian Building Research Institute is responsible for theinvestigation of techniques for prevention and mitigation of radon problems in dwellings.
A soil gas measurement method developed earlier [1] was applied to boreholes drilled to belowfoundation depth. Radon concentration and permeability were measured at 50 cm intervals.
It is estimated that more than 5000 householders in the UK have taken steps to reduce high radonlevels in their homes.
A data set of long-term radon measurements in about 2200 houses in southern Belgium has been collectedin an on-going national Rn survey. The spatial variation of indoor Rn concentrations is modelled byvariograms.
The relation between an increased risk for lung cancer and exposure to indoor radon is assessed inepidemiological studies. Both the quality and reliability of smoking data and the radon exposuredata are of primary importance.
For over ten years STUK (The Radiation and Nuclear Safety Authority, Finland) has performedsystematic indoor radon mapping with municipal health authorities.
In 1995 and 1996 radon concentrations and effective air flows were measured in about 1500 Dutchdwellings built between 1985 and 1993.
The very high indoor radon concentrations found in the western part of Switzerland in the early80th were at the origin of an extended research programme between 1987 and 1991.
Greek Atomic Energy Commission (GAEC) is the regulatory and competent authority on radiation protection matters.
Radon, radon progeny and unattached radon progeny were measured in two chambers with differentcharacteristics at the Jenolan Caves, New South Wales, Australia, in 1996.
Numerical modelling is a powerful tool for studies of soil gas and radon-222 entry into houses. It isthe purpose of this paper to review some main techniques and results.
In Denmark, a new survey of indoor radon-222 has been carried out. One-year alpha trackmeasurements (CR-39) have been done in 3019 single-family houses. There is from 3 to 23 housemeasurements in each of the 275 municipalities.
Radon surveys started in Estonia in 1989. The Department Building Physics at the Estonian BuildingResearch Institute measured radon levels in dwellings, in building materials produced in the country,and in the soil.
An Austrian farmhouse has been mitigated; it was built around the turn of the century in theconventional farmhouse style of that time.
Basic considerations1. Legal base fixing the limiting value for radon in residential and recreational premises.(Radiological Protection Ordinance of 22 June 1994)2.
Questions have been raised about the economic implications of the regulations governing radon gas level identification and remediation in buildings.
To clarify the mechanism of radon transport from soil to surface, long term continuous measurementsof radon exhalation were conducted at one site in combination with measurements of radon concentration in soil gas, soil temperature, pressure diffe
The evaluation of the geogenic radon potential is based on field measurements of radon activity concentration in soil gas.