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Radiation Protection Dosimetry 7:191-193 (1984)
© 1984 Oxford University Press

Improved Ionisation Chamber System for Indoor Exposure Measurement

K.E. Duftschmid and J. Witzani

The paper describes the development and testing of a large ionisation chamber with a 120 litre sensitive volume operated at normal atmospheric pressure and made from nearly air equivalent plastics material. The wall thickness of 5 mm (0.45 g.cm-2) is sufficient for secondary electron equilibrium up to several MeV. Due to a thin internal layer of higher atomic number material the wall absorption for low energy photons is compensated. In this way an energy response of ±2% in the range of 30 keV to 1.25 MeV is obtained, much lower than present high pressure ionisation chambers. With our digital current integrator, environmental dose rates in the order of 0.1 µSv.h-1 (10 µR.h-1) can be measured with a standard deviation of 1 nSv.h-1 (0.1 µR.h-1) within a 1000 s integration time. The instrument is particularly useful for measurement of spatial indoor exposure variations. Measurements in three different test buildings of well defined construction material (wood, concrete and bricks) and a comparison with the results of TLD exposure and track etching foil radon measurements are reported.


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