extrinsic		fused to magnify and increse resolution of a small organ
accuracy		influenced by atomic number and thickness of backing material
background		system cannot record another event
paralyzable		device used to eliminate all unwanted gamma rays except those of interest
parallel-hole		tested annualy
linearity		sunject is positioned as close as possible to the face of the collimator
nonparalyzable		minimum detectable activity
scatter		tested daily (uses Ce137)
collimation		radiation produced by naturally occurring sources
flat-field		disintegrations of a radioactive atom
constancy		allows for recording of events after recovery
absorption		most widely used type of multihole collimator
resolving time		used to include entire organ of interest
converging		source, media between source and detector, and the detector influences this
Chi square		information is loss as a result
random event		evaluates detector reliability from a statistical perspective
coincindence loss		sufficient numbers of gas atoms have recombined
MDA		is tested quarterly