Inverse Square Law for gamma radiation

This is a teacher or student controlled, realistic 3d simulation of an experiment that confirms the inverse square law for gamma radiation.  All forms of radiation follow the inverse square law.  That is the intensity of radiation declines as to the square of the distance from the source.  In this experiment we measure the background radiation and the count rates of gamma particles hitting a detector at a range of distances.  Plotting the results will verify the inverse square law.  

The user can move a lead block in front of the gamma source to measure the background radiation count, and then move the detector to a range of distances from the detector and take readings of the count for a fixed period of time.  TThe user is free to move anywhere within the laboratory in order to interact with the apparatus.