Mapping

Scale 1:200,000

7 map sheets covering the regions of the whole state area were published in 1990. Based on the geological, pedological, radiometric and hydrogeological maps at the same scale and soil gas radon  measurements in the major geological and lithological units, radon risk is expressed in three categories – low, medium and high. The maps are hand-drawn and are not converted for computer processing. A section of radon risk map 1:200,000 covers the area near Pøíbram (112 kB).

Scale 1:500,000

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The radon risk map 1 : 500 000 is included in the Atlas of  maps of the Czech Republic – GEOÈR500 together with other 10 maps with geoscientific thematics, published on the compact disc.  The GIS project was built for ArcView with the possibility of downloading ArcExplorer viewer directly from the CD. The vector data are in ESRI format, the tabelar data are connected in the *.dbf format. Topographic raster data use the *.tiff format. Radon risk is  characterised by  three basic categories (low, medium and high) and one interstage category (typical for the radon risk from low category to medium in the inhomogeneous Quaternary sediments). The data background is based on  7000 point data from radon database. The contours of geological units are filled after the prevailing radon risk in particular rock types.

Due to the GIS character, the single layers can be combined from all 11 maps with the geoscientific themes and construct the maps after users´ demand (eg. high radon risk sites – topography – radiometric map – hydrogeological map). The point data are connected with the databases, whose content can be presented in the window form on the screen.

Scale 1:50,000

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Since 1999, the Czech Geological Survey uses also the vectorized geological maps at the scale  of  1:50,000, enabling to construct  more detailed radon risk maps. The principle of construction is partly similar to generalised radon risk map, but the raster topography for the whole state territory (214 map sheets 1:50,000) is much more detailed. Therefore the more precise determination of radon risk from bedrock in particular villages and towns is possible. These maps (programme started in June 1999) will be used by the State Bureau of Nuclear Safety and municipal authorities for distribution of the track-etch detectors within villages and cities.

Usually at each geological map 40-90 rock types are specified. The rock types differ mostly by mineralogical composition or by stratigraphic position, the difference in primary uranium concentrations  and subsequently in radon activity is not so expressive. In combination with results from the radon database the particular rock types can be grouped into prevailing categories of radon risk. Grouping of vectorized geological units is performed in MGE programme and transformed into Microstation programme (Bentley), where the grouped contours of rock units are filled according to the prevailing category of radon risk. The test sites´ positions are loaded over the vectorized radon layer and topographic raster files (intravilan plans, road network and watersheds) are attached. Until 2005 all radon risk maps 1:50,000 (214 map sheets) covered the area of the whole Czech Republic. These maps are available in digital and printed form (base map coverage of the Czech Republic at a scale 1:50,000).