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Radiation Protection Dosimetry 45:107-110 (1992)
© 1992 Oxford University Press

Electret Ion Chamber System for Measurement of Environmental Radon and Environmental Gamma Radiation

P. Kotrappa, T. Brubaker, J.C. Dempsey and L.R. Stieff

Electret ion chamber (EIC) based radon monitors, known as Electret-Passive Environmental Monitors (E-PERM(r)) are being widely used for indoor radon measurements. Being a true integrator not significantly affected by varying temperatures and humidities, these are suitable for use in the outdoor environment. Some of the published data on such measurements are reviewed with relevant analysis of the results. These measurements include ambient levels measured by the US Environmental Protection Agency (EPA) and the ambient levels measured around phosphate areas by the Phosphate Research Institute. These units - when sealed in radon leak-tight bags - serve as sensitive passive environmental gamma monitors. Since the chamber and the sensor (electret) are made from near-tissue-equivalent material, these were found to give near-tissue-equivalent performance over energies from 15 to 1260 keV. Some of the field results obtained around nuclear plants are reviewed. These measurements include those measured by the National Institute of Standards and Technology (USA), the Oconee Nuclear Power Plant (USA), the Phosphate Research Institute (USA) and by the International Atomic Energy Agency in the Chernobyl area. The economics of the system are also briefly discussed.


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A. Clouvas, G. Takoudis, S. Xanthos, C. Potiriadis, and M. Kolovou
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