The Intensity of a Radiation Source Was Measured by a Geiger-Müller

Multiple Choice

The intensity of a radiation source was measured by a Geiger-Müller counter to be 236 counts per minute when the counter was place 124 ft from the source.   What will be the intensity when the counter is 248 ft from the source?

A) 59.0 counts per minute
B) 236 counts per minute
C) 118 counts per minute
D) 472 counts per minute