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The diffusion of  99 Tc in granite was investigated with small-sized diffusion cells, composed of a radioactive source solution cell and a sampling cell. Water in the two cells was kept at the same level. 1 ml aliquots were taken from the sampling cells daily during the first 50 days, then at intervals of several days, and measured via liquid scintillation counting. The experimental results indicate that the diffusion of  99 Tc and  3 H in granite follows the one-dimensional diffusion equation when diffusion time is long enough (&gt;100 days). The calculated average diffusion coefficient of  99 Tc (1.4×10 -12  m 2 /s) is about one half of that of  3 H (3.2×10 -12  m 2 /s).

Diffusion of 99 Tc in granite: A small scale laboratory simulation experiment