1. Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering Brehová 7, Prague 1, 115 19, Czech Republic
2. Crytur Ltd., Palackého 175, Turnov, 511 01, Czech Republic
3. Institute of Physics CAS, Cukrovarnická 10, Prague 6, 162 00, Czech Republic
4. Institute of Physics CAS, Cukrovarnická 10, Prague 6, 162 00, Czech RepublicdUniversity of Chemistry and Technology Prague, Department of Glass and Ceramics, Technická 5, Prague 6, 166 28, Czech Republic