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Ken Becker has suggested that radiation therapy might be useful as a means of a "non-invasive" alternative to surgical palidotomy. On the surface, this may seem to be a viable technique - after all, radiation therapy is routinely applied to the effective treatment of brain tumors. The limitation, in my opinion, is that radiation-induced brain tissue damage can not be precisely limited to the desired few cubic millimeters. Therefore, more extensive undesirable side effects would be produced. Milton McLain Certified Health Physicist Nuclear engineer