room model

The use of supply jet flows is the most common type of air distribution for general ventilation. Usually the supply flow rate is constant or slowly varying (VAV-systems) to cope with a varying load. A novel air distribution method, with the potential to reduce stagnation and to increase the ventilation efficiency, is to introduce rapid flow variations (pulsations). This paper reports on a fundamental study of this type of air distribution.

In situ gamma spectroscopy is widely utilised to determine the outdoor gamma dose rate from the soiland to calculate the natural and artificial radionuclide concentration and their contribution to the doserate. The application of in situ gamma spectroscopy in indoor environments can not supplyquantitative information about activity concentration of radionuclides in buildings materials, but thistechnique can provide interesting information about building materials as radon source.

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. Forone of them, a sensitivity analysis regarding the effect of changing the parameters (e.g. dimensionsof the room, thickness and density of the walls, etc.) used in calculations is performed.