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It might be safer and longer lasting to cover them with pellets of borosilicate glass made with B10. Borosilicates are sometimes used as control rods. If there are leaks it would be more likely to remain and it could always be wet down with water.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Thu Mar 31st, 2011 at 05:36:18 PM EST
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