Geometric Efficiency Is Defined
A)as the Ratio of the Number $\mu$

Geometric efficiency is defined

A) as the ratio of the number of detected events to the number of source emissions.
B) as the fraction of emitted photons (gamma or x-rays) that hit the detector; it depends on the detector configuration and its distance from the source.
C) as the fraction of gamma rays that are detected when they hit the detector; it depends on the thickness (t) and attenuation coefficient ( $\mu$ ) of the detecting material.
D) as the amount of blurring that is produced by an imaging system, characterized by point spread function and line spread function.