The effect of irradiation upon the diffusion of He produced by α-decay in apatites was considered. An analysis of implanted 3He diffusion in 2 compositions was carried out by using the 3He(d,p)4He nuclear reaction and a deuteron milli- or micro-beam. During 163MeV Au-ion bombardment, a significant fraction of 3He atoms migrated towards the surface below which they were trapped, while a proportion of 3He atoms remained trapped in the end-of-range region. A clear He loss was detected. These radiation-induced migration effects were enhanced in Ca10(PO4)6F2, as compared with Ca4Nd6(SiO4)6F2.

Effect of Gold Ion Irradiation on Helium Migration in Fluoroapatites Investigated with Nuclear Reaction Analysis. S.Miro, F.Studer, J.M.Costantini, P.Berger, J.Haussy, P.Trouslard, J.J.Grob: Journal of Nuclear Materials, 2007, 362[2-3], 445-50