Peter Attia· MD
for someone who I'm treating with say eight weeks of radiation for prostate cancer their prostate may get 80 gray in two 1.8 to two gray fractions per day but that's literally only to a small volume roughly the size of the prostate gland itself and when you even get just a few millimeters away from that that dose gets cut in half and then it's exponentially lower because the intensity of the radiation varies with the square of the distance