To treat spot on brain tumors, doctors can use small beam of ___ that are focused to waste solely the tumor cell?

a) X-rays
b) beta rays
c) alpha rays
d) gamma rays
Answers:
d
http://wiki.answers.com/Q/Which_form_of_…

i read the article but wasn't able to get an exact answer coz it say that both gamma rays and x-rays are used to kill tumor cells. so you can eliminate B and C. But that's almost all the help I can be. sorry
A and D and Proton beams.

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