Question: An 8-cm diameter by 8-cm long NAI(TI) detector detects gamma rays of a specific energy from a point source of radioactivity. When the source

An 8-cm diameter by 8-cm long NAI(TI) detector detects gamma rays of

An 8-cm diameter by 8-cm long NAI(TI) detector detects gamma rays of a specific energy from a point source of radioactivity. When the source is placed just next to the detector at the center of the circular face, 50 percents of all emitted gamma rays at that energy are detected. If the detector is moved to 1 meter away, the fraction of detected gamma rays drops to A. 10-4 B. 2x10 4 C. 4x10-4 D. 8 x10 4 E. 16 x10 4

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