Well, I had internalized that you get neutron contamination when you treat with accelerating voltages of 10 MV or higher, and I didn't bother to look it up. It'

Well, I had internalized that you get neutron contamination when you treat with accelerating voltages of 10 MV or higher, and I didn't bother to look it up. It's generated in the X-ray target by the reaction of the 10 MeV electron with a tungsten nucleus: https://inis.iaea.org/collection/NCLCollectionStore/_Public/33/050/33050453.pdf https://inis.iaea.org/collection/NCLCollectionStore/_Public/... So it's more accurate to say that megavoltage X-ray beams contain neutrons by default. I might need to know this on the ABR... :p