Answer:
The amount of exposure that will be received at 3 ft is 8 mGy
Step-by-step explanation:
Here, we note that the amount of radiation exposure of the radiographer is given by the inverse square law. That is the amount of radiation exposure is directly proportional to the inverse square of the distance that is

Or New intensity =
= 8mGy
Therefore, the amount of exposure that will be received at 3 ft = 8 mGy.