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Wikipedia's pages support the claim that He has a smaller radius than H (at least Van der Waals' radius):
http://en.wikipedia.org/wiki/Atomic_radii_of_the_elements_% 28data_page%29
http://en.wikipedia.org/wiki/ Atomic_radius#Empirically_measured_atomic_radii
http://en.wikipedia.org/wiki/Atomic_radius#Calculated_atomic_radii
Is the leakage you refer to an actual physical leakage (i.e. diffusion) of gas into or out of the tubes?