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Here is a quote from one of my earliest journal entries.
"Healthy cells tolerate the destructive force of radiation better than cancer cells. Therein lies the effectiveness of radiation for treating cancer. One characteristic of a proton beam is known as the Bragg Peak. As described in an article by James Metz M.D. "...the absorbed dose of a proton beam increases very gradually with increasing depth and then suddenly rises to a peak at the end of the proton range." The energy level beyond the Bragg Peak is relatively negligible. Another important characteristic of a proton beam is it can be manipulated to deliver optimal levels of energy to precise locations within the target area. In layman's terms cancer cells can be nullified with pinpoint accuracy. By way of contrast an xray beam, the more common form of radiation, tends to deliver equal amounts of energy from the entry level through the target volume to the point of exit. These differences in radiation characteristics translate into less collateral damage from proton beam radiation. Herein lies the proton advantage."
When advised by my RO that he could limit the depth of the photon radiation by using only electrons to treat my gynacomestia I accepted his professional assurance.
Joe and Jon:In response to your posts I Googled "Electron Therapy" with the following result: "Electron therapy or electron beam therapy is a kind of external beam radiotherapy where electrons are directed to a tumor site."
I'll leave it to someone else to research these topics more thoroughly if so inclined.