blackens with radiation exposure and is used to measure radiation
a ready pack film (film in a light tight paper package) is sandwiched in
between two solid water slabs and exposed to a radiation beam to determine the
accuracy of the planning computer in predicting the radiation delivery to the
used in IMRT treatments in which the radiation dose distribution is a
complicated sum of many individual beamlets. The irradiated film is developed
and read by a film densitometer. The intensity distribution is fed into a
computer and compared with the expected radiation distribution.