Question: during radiotherapy treatment for cancer an area of lung tissue...
During radiotherapy treatment for cancer, an area of lung tissue absorbs 6 MeV x-ray photons produced by a linac (1 eV = 1.6 x 10–19J). A total of 7.2 x 1010 photons are absorbed by the lung tissue, which weighs a total of 500g.
The radiation weighting factor for x-rays is 1, and the organ weighting factor for the lungs is 0.12.
The effective dose is: