FRCR MCQ ON SCINTILLATORS (NUCLEAR SCAN)

569.Scintillators used in PET is/are

a.bismuth germinate

b.lutetium oxyorthosilicate

c.gadolinium oxyorthosilicate

d.sodium iodide

e.calcium zinc phosphate

571.True regarding scintillation detectors

a.effective atomic number of bismuth germinate is 51

b.decay time of bismuth germinate is 300ns

c.typical energy resolution at 511 keV is 10%

d.decay time of gadolinium oxyorthosilicate is 60ns

e.effective atomic number of lutetium oxyorthosilicate is 75

ANS OF PREVIOUS BLOG

648.True regarding spatial resolution of gamma camera

a.resolution is best close to the collimator

b.the wider the hole ,the better the resolution

c.the shorter the hole ,the better the resolution

d.the better the resolution ,the less the sensitivity

e.at the cost of FOV ,reolution and sensitivity both can be maximized

648.ade-----spatial resolution  is best close to the collimator. The wider the hole ,the worse the resolution.The shorter the hole ,the worse the resolution. .