The T released from neutron-irradiated borosilicate glass was determined by using a specially designed sampling system and a liquid scintillation counter at 200 to 700C. It was found that the chemical form of T released was mainly tritiated water (HTO, T2O). The T produced in the glass tended to react with O to form OT and to diffuse out via a similar mechanism to that of the molecular diffusion of water in glasses. The diffusion coefficient of tritiated water in borosilicate glass obtained could be expressed as:

D (cm2/s) = 5.3 x 10-4 exp([-128kJ/mol)/RT]

Y.Yamamoto, H.Atsumi, S.Yamanaka, M.Miyake: Journal of Nuclear Materials, 1984, 120[2-3], 161-5