Charged Particle Detection 1David Futyan Range As a heavy particle slows down in matter, rate of energy loss increases, since dE/dX  1/  2 Most of the energy loss occurs at the end of the path As a result, a beam of mono-energetic stable charged particles will travel approximately the same distance in matter - referred to as the range Medical application: treatment of tumors 27 Penetration depth dE/dX Bragg curve Penetration depth Transmitted Fraction Mean range