R. Gröne1, J. Hascik1, V. Slugen1, J. Kuriplach2, R. Lipka1, P. Pietryzk1, K. Vitazek1
1 Department of Nuclear Physics and Technology, FEI STU Bratislava, Ilkovicova 3, 81219 Bratislava, Slovak Republic,
2 Department of Low Temperature Physics, Charles University, V. Holesovickach 2, CZ-18000 Prague 8, Czech Republic
Design of the five detector set-up, suitable for positron 1-Dimensional Angular Correlation of Annihilation Radiation (1D-ACAR) study of 60Co - containing materials as well as test measurements are described in the article. The equipment is based on simultaneous registration of a starting positron (by detection of gamma-photon with energy 1274 keV) and its annihilation with an electron in the studied material (by detection of 2 annihilation gamma-photons with the energy of 511 keV emitted mainly at the 180º - angle). Through this triple coincidence the disturbing 60Co - contribution (gamma-photons with the energy of 1.17 and 1.33 MeV) can be effectively separated from the annihilation spectra of irradiated reactor pressure vessel steel specimens.