The best way to reduce your radiation dose from a Co-60 gamma emitting source is to _______.
A) reduce the temperature of the source
B) move twice as far away
C) spend half the time near the source
D) double the thickness of wood between you and the source
E) nonsense! You cannot change the potential dose

Question

Quizplus · Accepted Answer

The intensity of radiation decreases by the inverse square of the distance from the source, so moving twice as far away from the source will reduce the radiation dose by a factor of 4.

The Best Way to Reduce Your Radiation Dose from a Co-60