Influence of helium implantation technique on molybdenum radiation hardening

Experimental results of studying radiation hardening of helium-implanted molybdenum in the 10-5-10-2 at.% concentration range are presented. Helium implantation into the material was exercised in a cyclotron by three different methods differing by the quantity ratio of displaced atoms to helium concentration and ''hardness'' of spectra of preliminary knocked-out atoms (PKA). The degree of radiation hardening is shown to essentially depend on the technique of molybdenum cyclotron alloying, and it is not determined only by implanted helium concentration and level of vulnerability to damage but difference in PKA spectra