The Gamma
Knife uses ionizing radiation (gamma rays) produced by 201 cobalt-60
sources to target and destroy a tumor, a blood vessel abnormality
such as an arteriovenous malformation (AVM) within or adjacent to
brain tissue, or to treat the symptoms of Parkinson’s disease
and trigeminal neuralgia (an excruciatingly painful facial condition)
with extreme accuracy. Since each individual gamma ray is of relatively
weak intensity, the normal brain tissue surrounding the abnormality
is protected as the full doseof radiation is focused only at the point where all 201
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