1. Department of Radiation Safety and Security, Paul Scherrer Institute, Villigen PSI, Switzerland
2. Physics Department, Oklahoma State University, Stillwater, OK, USA
3. Landauer Inc., Crystal Growth Division, 7231⁄2 Eastgate St., Stillwater, OK, USA
4. Landauer Europe, 9 rue Paul Dautier CS, Vélizy-Villacoublay, France
5. Politecnico di Milano, Dipartimento di Energia, via la Masa 34, Milan, Italy