1. BFS - Federal Office for Radiation Protection, Department of Medical and Occupational Radiation Protection, Ingolstädter Landstr. 1, Oberschleißheim, Germany
2. CIEMAT, Departamento de Medio Ambiente, Dosimetría Interna, Av.da Complutense 22, 2Madrid, Spain
3. ENEA Casaccia Research Center, Division of Health Protection Technologies, Laboratory Biosafety and Risk Assessment, Via Anguillarese 301, Santa Maria di Galeria Rome, Italy