Atlas of Caesium Deposition on Europe After the Chernobyl by European Communities

By European Communities

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Modern airborne spectrometers comprise either high volume scintillation detectors (typically 1-50 litres of NaI(Tl)) or Ge detectors, the latter providing better spectrometric resolution but lower sensitivity. These systems can operate automatically or semi-automatically, and are capable of reliable measurement even at low deposition levels with sampling time of a few seconds. 38 APPENDIX B Summary of deposition measuring techniques and data The various methods have their strengths and weaknesses and, in a well established monitoring strategy, use is likely to be made of several approaches in combination.

The gridded values can then be converted into a Cartesian matrix consisting of rows and columns. The intersection of the columns and the rows generate cells to which are attributed the value describing the analysed feature. The conversion of an area into such a matrix is known as rasterisation. In general, rasterised data can be presented in two different ways: by a raster or by isolines. In the case of raster presentation (also called pixel map) every cell is coloured as a function of its value or by isolines.

For example, all towns within 100 km of the Chernobyl site can be identified, the relationship between caesium deposition, topography and precipitation levels can be correlated while the effect of urban heat islands on deposition patterns can be assessed. For any atlas, a crucial element is the presentation of the final results. g. roads, rivers, political boundaries) to produce a series of graphic files. As in the case of maps, a GIS provides the user with tools to display data by a range of symbols and colours.

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