Detection of Hydrogen in Neutron Irradiated Nickel using Positron Lifetime Spectroscopy
Résumé
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: 310-3 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.
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