A dose of 174 times 104 Gy was estimated for part of the bod

A dose of 1.74 times 10^-4 Gy was estimated for part of the body just in front of an unscreened x-ray film Suppose that a screen permits the dose to be reduced by a factor of 20 Calculate the skin dose on the other side of the body (the entrance skin dose) assuming 50-keV photons and a body thick of 0.2 m. Assume that only unattenuated photons are detected, and that dose is proportional to the number of photons.

Solution

skin dose=original dose/ factor x thickness

where original dose=1.74 x 10^-4 / 20 x 0.2

=>0.435x 10^-4 Gy