Fábián F., Csordás A., Shahrokhi A., Omori Y., Somlai J., Kovács T., 2013, Intercomparison of thoron measuring devices in the RRI thoron calibration chamber, Proceedings of 7th Hungarian Radon Forum and Radon in Environment Satellite Workshop, University of Pannonia, Veszprém, Hungary, Pannonian University Press, Veszprém, 61-72.