The He3 won't combine with the walls, but it could be absorbed. If not, and if it is reionized it will head toward the center again. It could just hang around as neutrals too.
The triton is another matter. It can easily fuse itself with a deuteron in the center it if it is turned and sent back for a number of passes. It could also become a neutral or bond with a deuteron chemically to form a dt molecule. In the fusor environment it is a bit hot to do this and remain stable though.
Ultimately, if the tritium or He3 is not pumped out of the chamber, they will certainly escape when the system is torn down for maintenance.
We have covered this on the old BBS and it is seen that the production of the these two by-products in the amateur fusor is minimal and plays almost no role in the operation.
Richard Hull
Created on Wednesday, April 04, 2001 1:16 AM EDT by Richard Hull