Three different investigations of radon in Swedish dwellings are presented - a nationwide study conducted primarily to determine the collective dose to the Swedish population from exposure to radon and radon daughter, a supplementary study of newly built detached houses in order to find out whether theregulations in the Building Code prescribes acceptable radon levels in new houses built on normal ground, and measurements made by the local authorities in order to find houses with levels of radon daughters above the norm.
To develop effective monitoring and control programs for indoor radon it is important to understand the causes of the broad range of concentrations that have been observed. Measurements of indoor radon concentration and air-exchange rate in dwellings in several countries indicate that this variability arises largely from differences among structures in the rate of radon entry.
Compares the air change rates measured using the decay method with several different tracer gases. The tracer gas measurements were conducted in atightly sealed room where constant air leakage rates, ranging from 0.05 to 1 air change per hour could be maintained using an exhaust fan. The tracer gases investigated were CH4, CO, CO2, N2O and SF6. The agreement between tracer gas measurements and measured flow rates of the exhaust fan was very good for CH4, CO and N2O.
Volatile organic chemicals in indoor air of a home-for-the-elderly and a new local government office building were identified and quantified using Texax GCR samplers and capillary gas chromatography/mass spectrometry analysis. Over three hundred chemicals were tentatively identified in indoor air of thehome-for-the-elderly. Comparison of night-day levels were made. The new office building was also part of a longitudinal study which revealed a rapid decrease in levels with time for some chemicals (after completion) while others increased.
Adduces the economic advantages of weatherstripping for energy conservation, performance criteria and future developments in materials and fixings. Mentions the advantageous psychological response of personnel. Describes the factors influencing performance - window section, location of seal andinstallation method. Briefly describes the work of the Draughtproofing Advisory Association (DAA). Refers to BS 4315 and demonstrates need for new standards based on air flow measurement round total opening perimeter.
Describes a novel modification of stroboscopic illumination used to give an unambiguous record of the direction of the flow in an otherwise conventional visualisation of a complex three dimensional air flow. The flow was seeded with small soap bubbles which were viewed by scattered light. Each flash of light was split into two periods of unequal length, separated by a short extinction, thereby marking the direction of flow on the photographs. The technique allows a more complete determination of the velocity field than can be obtained by the usual stroboscopic method.
The R-values of permeable insulation systems are generally determined in test apparatus designed to assure one-dimensional heat transfer and to assure no air intrusion effects. Such classical R-values are used to help describe insitu heat-tra
Describes the different types of monitoring and sampling techniques that can determine the radiation burden of the general public from radon and its decay products. This is accomplished by measuring the range and distribution of radon and rad
Simulation methods and test results are presented here to confirm projections of actual total suspended particulate (TSP) concentration levels for representative office buildings, with particular emphasis on the 0.3 to 5 micron particulate si
The U.S. EPA initiated an indoor air monitoring program in 1982, concentrating on commercial or public-access buildings (homes for the elderly, schools, and office buildings). Several buildings from each category are sampled over 2-3 day peri
Login