Measuring instrument for determining radon concentrations

摘要

The invention relates to a measuring instrument for determining radon concentrations in materials, especially in building material, rock, soil and the like, consisting of a hemispherical measuring bell, an alpha -ray detector, a high-voltage source and various evaluation modules. According to the invention, the alpha -ray detector 30, the evaluation modules 36, 38, the measuring bell 42 and the high-voltage source 34 are combined in a casing 22 to give an integrated, portable device and are of interchangeable design. <IMAGE>