Derek is on the money and Derek... thank you
I think I owe you Cadbury or Jaffa Cakes on my next trip over!
I can share 1 tidbit more on it.... since GK is a single dose treatment and CK is mostly fractionated (yes, 1 dose is sometimes recommended, but for the most part, it's usually done in 3-5 dose), fractionating the treatments thought process is... by fractionating, there is potentially lower risk of the surrounding, normal structures from being affected by the radiation....
(I think I need more coffee, that didn't sound right..., but I think you all know what I meant).
Nick, many of us here that have had FSR/CK/GK are more than happy to loan our good ears (and shoulders) if need be.... you can send any of us a PM here.