You searched for: “proton therapy
proton-beam therapy, proton beam therapy, proton therapy
1. Treatment in which doctors use nuclear technology and magnets to fire protons into tumors at about two thirds the speed of light.

Proton therapy's promise lies in its ability to destroy cancerous cells while sparing healthy cells half a millimeter away, reducing side effects. It also allows doctors to ramp up the radiation dose, theoretically improving cure rates.

The precise targeting is possible because the subatomic particles release the bulk of their destructive energy beneath the skin, at the tumor's depth, rather than near the surface, as X-rays do; and while standard radiation tends to cause damage to healthy tissues on the far side of tumor, protons slow and stop as they release their energy pulse, eliminating a harmful exit dose.

—Compiled from information discovered in the
U.S. News & World Report, by Adam Voiland in "The Promise of Proton-Beam Therapy";
November 18, 2008.
2. A precise form of radiation treatment for cancer and other conditions.

It is said to minimize damage to healthy tissue and surrounding organs, and such proton treatment is considered to be highly successful and it results in fewer side effects.