Detection of Hydrogen in Neutron Irradiated Nickel using Positron Lifetime Spectroscopy

Troyo Dimov Troev (1) , Toshimasa Yoshiie (2) , Chunqing He (2, 3) , Koichi Sato (4, 5) , Qiu Xu (6) , Stela Georgieva Peneva (7)

1 Institute for Nuclear Research and Nuclear Energy
2 Material Sciences
3 Material Sciences
4 Research Reactor Institute
5 Research Reactor Institute
6 Research Reactor Institute
7 Institutte for Nuclear Research and Nuclear Energy

Hydrogen in nano-voids in neutron-irradiated nickel has been detected using positron annihilation lifetime spectroscopy (PALS). As positron lifetime is greatly affected by nano-voids bound with hydrogen, special attention was paid to the analysis. The positron lifetime of neutron-irradiated nickel at higher irradiation dose increased with the dose, which is an indicator for vacancy clusters (nano-voids) formation in the lattice. The introduction of hydrogen in well-annealed nickel by electrical charging resulted also in an increase in positron lifetime due to vacancy formation. In neutron-irradiated nickel specimens, hydrogen charging shortened the positron lifetime from 456 to 334 ps (irradiation dose: 310-3 dpa). Isochronal annealing behavior of hydrogen-charged nickel and neutron-irradiated nickel has also been studied. Positron trapping rate was calculated using a simple trapping model. Thermal desorption spectroscopy [TDS] has been used for investigation of hydrogen behavior in non-irradiated hydrogen charged nickel.

Mots clés: Physical Sciences

Troyo Dimov Troev, Toshimasa Yoshiie, Chunqing He, Koichi Sato, Qiu Xu, et al.. Detection of Hydrogen in Neutron Irradiated Nickel using Positron Lifetime Spectroscopy. Philosophical Magazine, 2009, 89 (14), pp.1183-1195. ⟨10.1080/14786430902915404⟩. ⟨hal-00514018⟩