Positron annihilation studies of neutron irradiated and thermally treated reactor pressure vessel steels

Study of PRIMAVERA steel samples by a positron annihilation spectroscopy technique

“…This effect can be, most probably, assigned to annealing of a part of originally higher concentration of these defects due to thermal and radiation exposure of steel samples. A similar effect, namely a decrease of the positron lifetime in VVER-440 base material after irradiation (7.81 Â 10 23 m À2 ), has been observed with the PAS-LT measurements and published in [8]. We can argue that creation of new radiation-induced defects is here in competition with the annealing effect due to temperature and due to neutron irradiation.…”

“…The role of copper precipitation and phosphorus segregation in the radiation embrittlement has been discussed earlier [e.g. 8,9]. Although impact of copper and phosphorus was not directly observed in the present study, one of the aims of our work was to use unique abilities of the ACAR technique in the characterization of the crystal lattice, which might be, after radiation treatment, affected by the chemical composition.…”

“…Our study of model VVER-440 weld materials also took account of the published PAS experiments of Kocik et al [11] and Slugen et al [8]. As can be seen in Fig.…”

“…doi:10.1016/j.jnucmat.2010.08.046 science, where the slow positron beam technique (e.g. PLEPS) has been used [6,[8][9][10].…”

Methods of Positron Annihilation Spectroscopy in Nuclear Technology 1. Constructional Materials of Active Zone Reactors (Method of Temporal Distribution of Annihilation Photons)

“…Применение позитронной спектроскопии в физике и химии конденсированных сред обусловлено тем обстоятельством, что этот метод позволяет получать богатую, а зачастую уникальную информацию о свойствах этих сред [4][5][6][7][8][9][10][11][12][13][14]. Кроме того, позитронная спектроскопия относится к методам неразрушающего контроля и позволяет проводить исследования слоистых структур и поверхности твердого тела.…”