1. Fundamental Physics Institute, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, Madrid 28006, Spain
2. Department of Nuclear Medicine and Radiobiology, Faculty of Medicine and Health Sciences, University of Sherbrooke, Québec, Canada
3. Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica 2829-516, Portugal
4. Institut de Recherche en Astrophysique et Planétologie (IRAP), Université Toulouse III - Paul Sabatier, 9 Avenue du Colonel Roche, Toulouse 31028, France
5. Spanish Meteorological Agency (AEMET), Murcia, Spain
6. Centre for Medical Radiation Physics, University of Wollongong, NSW, Australia