Assignment:
A small air-filled cavity ion chamber has copper walls with thickness equal to the maximum electron range. The cavity volume is 0.1 cm3, the air density is 0.001293 g/cm3, and a given γ-ray exposure generates a charge (either sign) of 7.00x10-10 C.
(a) What is the average absorbed dose in the cavity?
(b) Apply B-G theory to estimate the absorbed dose in the adjacent copper wall, assuming amean energy =0.43MeV for the cavity-crossing electrons.
(c) Suppose is 34% in error and should have the value 0.65 MeV. Redo part (b). What was the resulting percentage error in DCu?