Radon progeny concentration is measured with a total alpha counting system in 185 dwellings in thetown of Thessaloniki. The Equilibrium Equivalent radon Concentration (EEC 222Rn) follows a lognormaldistribution with an arithmetic and geometric mean value of 28 Bq/m3 and 16 Bq/m3 respectively. Simultaneous in situ alpha and gamma spectroscopy measurements were performed in 60 schools of Thessaloniki. The mean equilibrium Equivalent Concentration of radon and thoron is 22 Bq/m3 and 0.9 Bq/m3 respectively.

A national survey of indoor radon levels in Lithuania was performed between 1995 and 1998. The main objective of this survey was to evaluate the average of indoor radon concentrations in Lithuania and to determine whether there were significant variations with different areas.

Electret ion chamber (EIC) for monitoring radon consists of a stable electret (electrically chargedTeflon disc) mounted inside an electrically conducting chamber. PERM? passive integrating electretionization chambers for measuring radon in air has a restricted filtered passive access to radon (222Rn), allowing it to respond only to radon and not to thoron(220Rn) A modified unit called thoron monitor, with unrestricted access to thoron responds to both radon and thoron. Radon monitor and thoron monitor when used side by side allows measurement of both radon and thoron concentrations in air.

Indoor 222Rn concentrations are influenced by several factores which may change with time,thereby causing temporal fluctuations of radon concentrations in rooms.

This study describes an approach for measuring and modeling diffusive and advective transport of radon through building materials. Goal of these measurements and model calculations is to improve our understanding concerning the factors influencing the transport of radon through building materials. To reach this goal, a number of experiments has to be conducted. These experiments, including measurements in a large cylinder for creating diffusive and advective transport of radon under controlled, dwelling-like conditions, are described here and the initial results are presented.

If indoor radon levels are to be significantly reduced across Europe it is essential to ensure that allnew buildings built in areas affected by radon are protected against radon.In the United Kingdom the Building Research Establishment Ltd (BRE) have been carrying outresearch on behalf of the Department of the Environment, Transport and the Regions (DETR) todevelop protective measures for use in new buildings. This work commenced in the mid-1980sand has resulted in the development of a range of practical cost-effective techniques for providingradon protection in new UK buildings.

Radon as an indoor air pollutant has been extensively researched worldwide over the past thirtyyears. However, radon is only one of several other important pollutants present in the indooratmosphere. In addition to radon as an ubiquitous indoor pollutant, the simultaneous presence ofother non-radiological pollutants, such as toxic alkanes found in the working environment, needs tobe accounted for its integrated mitigation approach.

So far, the ideal-tight typical cross section is usually considered at the evaluation of constructions with the help of hygrothermal simulation. Usually always appearing additional humidification at lightweight construction elements, caused by convection, is not considered so that impermeable constructions seem, contrary to practice, more favourable...

There are currently at least 6 national and European standards in Germany, which describe the assessment of infiltration- and exfiltration-volume flows subject to building air tightness. The results of window ventilation and balanced ventilation systems are identical for some standards; they partly distinguish themselves in height. The dependence...

In order to determine the causes of SHS (Sick House Syndrome), a field survey on indoor air quality and health conditions of occupants has been conducted for 8 years in 77 detached wooden houses in Japan. The result of this survey had been reported partly in the proceedings of Indoor Air 2008. In most of these houses...