I presume that you are all talking about PBT (AKA Proton Beam Therapy). There are around 1/2 dozen treatment centers operational in the US today. It costs a LOT of money to set one up. MDACC spent 200M on theirs (contrast with 9M for an IMRT machine). Loma Linda, by the way, commonly uses IMRT with it to acheive clean margins as PBT is so accurate. So you might get ionizing radiation even if you elect to go with PBT. It is showing great promise and has much higher patient throughput. One PBT generator can service multiple treatment rooms/gantries.
More information: http://health.usnews.com/articles/health/cancer/2008/04/16/the-promise-of-proton-beam-therapy.html

And:

http://www.proton-therapy.org/index.html

It is hard to gain access to however with only 6,000 treatments spots avaiable. Don't look for it to come to a hospital near you anytime soon however.

One other factoid - practically all OC cancer treatments have their roots in prostate cancer treatment.



Gary Allsebrook
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Dx 11/22/02, SCC, 6 x 3 cm Polypoid tumor, rt tonsil, Stage III/IVA, T3N0M0 G1/2
Tx 1/28/03 - 3/19/03, Cisplatin ct x2, IMRT, bilateral, with boost, x35(69.96Gy)
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"You are a mist that appears for a little while and then vanishes" (James 4:14 NIV)