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As far as I can tell, "heavy ion" and "light ion" are used interchangeably for ion therapy... Very strange. 126.96.36.199 08:55, 29 September 2007 (UTC)
Yes, I don't think there is a consensus. Consider Carbon. It is a light ion, in that it has an atomic number of only 6 (Uranium is heavy at 92). However, it is probably the heaviest ion worth using for therapy (due to a radiobiological effect called overkill). So it is a light and heavy ion. Blondandy (talk) 18:28, 16 December 2008 (UTC)
The article needs to be edited since the HIT in Germany is treating patients since Nov. 2009 (as even stated in the article). So it's not two but three centers. — Preceding unsigned comment added by 188.8.131.52 (talk) 21:04, 27 November 2012 (UTC)
The external link to the "Particle Therapy page from Siemens" is no longer working and this is probably due to the fact that Siemens AG has doscontinued their Particle Therapy business, and are now only working on finishing the two remaining projects: ShaPHIH (Shanghai Proton and Heavy Ion Hospital) and PTZ Marburg.
Cost of carbon facilities
When listing the disadvantages of carbon (or heavy ions in general) facilities I think it would be appropriate to mention the cost, due to the larger atomic mass and hence the larger magnetic fields required in the magnets.