Apparatus and method for venting radon gas from under a building
The invention relates to the protection of buildings from the ingress of unwanted gases, such as radon. The invention comprises a sump liner 27 which is introduced into an underground cavity or sump 22. The sump liner comprises a generally elongate hollow body 26 which is connected to an extraction pipe 30 leading to a discharge point 34. The hollow body 27 has at least one aperture 46, 47 in its side wall to allow ingress of subterranean gases from the surrounding soil when located within the sump or cavity 22. The sump liner may be manufactured by injection moulded. Later embodiments relate to a system and method for extracting subterranean gases by connecting the sump liner to a fan 32 which is in turn connected to a discharge unit 33. Alternatively the extraction means may be a passive extraction means.
Environmental situation awareness in this study focuses on monitoring techniques to discover public safety and potential risks at local spots. Changing amount of radiation dose recently has become a great concern by citizen near nuclear power plants. Observation approach to resolution of the concern in this study is the application of Unmanned Aerial Vehicle equipped with a situation monitor in order for covering observation points at the local spots which cannot be accessed by walking or wheeled vehicle. This paper presents an ontology based map integration process that merges 3D trajectory maps into a local distribution map in Google earth. 3D to 2D projection is introduced to visualize changes in spatial situation at ground level by calculation of radiation dose based on distance decay.