A Highly Focused Treatment for Brain Cancer Relies Upon _____________________

A highly focused treatment for brain cancer relies upon _____________________.

A) ¹²⁵I nuggets hemisperically arranged around the tumor, emitting convergent alpha particle beams which create the so-called alpha knife.
B) ⁹⁹Tc nuggets hemisperically arranged around the tumor, emitting convergent X ray beams which create the so-called X ray knife.
C) ⁶⁰Co nuggets hemisperically arranged around the tumor, emitting convergent gamma ray beams which create the so-called gamma knife.
D) ⁹⁹Mo nuggets hemisperically arranged around the tumor, emitting convergent beta ray beams which create the so-called beta knife.