On the Characterization of Small-Scale Samples Using Radioisotope Positron Sources |
| M. Saro, V. Krsjak, M. Petriska, V. Slugen
Institute of Nuclear and Physical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovicova 3, Bratislava, 812 19, Slovakia |
| Full Text PDF |
| Probing of small-scale samples such as thin ion-implanted layers or TEM discs using conventional radioisotope sources is a rather complicated task due to the range of energies of the emitted positron. Besides, experimental spectra obtained from samples containing internal transmutation-based positron source are naturally disturbed by positron annihilation outside of the sample. To estimate these contributions to the spectra, the Geant4 simulation toolkit was used. In addition to various absorption profiles of positrons from realistic encapsulated sources, the use of TEM disc containing 44Ti/44Sc as an external positron source is discussed and suggested. |
DOI:10.12693/APhysPolA.137.193 topics: positron annihilation, radioisotope source, depth analysis |