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Radiation Protection Dosimetry Advance Access originally published online on April 24, 2008
Radiation Protection Dosimetry 2008 130(1):48-51; doi:10.1093/rpd/ncn118
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Effective dose assessment for workers in caves in the Czech Republic: experiments with passive radon detectors

L. Thinová1,* and I. Burian2

1 Department of Dosimetry, Czech Technical University in Prague, 110 00 Prague 1, Czech Republic
2 National Radiation, Chemical and Biological Protection Institute, Radon Experts Group, Kamenná, 262 31 Milín, Pribram, Czech Republic

* Corresponding author: thinova{at}fjfi.cvut.cz

The new RAMARN system for radon volume activity measurement was developed in 2003 and has been in use since then. RAMARN system consists of a plastic chamber that is conically cylindrical in shape and about 0.5 l in volume; a bare Kodak LR 115 is located on the bottom of this diffusion chamber. The size was chosen to avoid the influence of deposited decay products of radon. Kodak has a spectrometric character—the tracks are visualized only for alphas with energies between 1 and 3 MeV that touch the foil; thus the effective volume has a lens shape. The response therefore corresponds to diffused radon and half of 218Po born by radon gas decay. The experiments described below were conducted as one part of a routine methodology control, focused on classifying worker irradiation from natural ionizing radiation sources in show caves and in caves used for speleotherapy.


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