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Instrumentation week 2 quiz questions
Terms in this set (26)
if a scintillator should receive moistrue the technologist would notice what visual change? why is this a problem?
alters absorption and the image produced
what 2 types of photon interactions take place in the scintillator?
photo electric effect
what is the test done on the well counter that ensures that the high voltage is multiplying the gamma ray signal by amount that is appropriately related to the settings of the detector?
calibration and peaking
what test is done on an uptake probe that evaluates how well a detector distinguishes between gamma rays of closely spaced energies?
5 major components of a well counter beginning with the photon interaction and ending in the registration of current
pulse height analyzer
in the well counter pulses are electronically sorted by the_______ as specified by the energy window settings
pulse height analyzer
radiation emission is called
most common inorganic solid scintillator used in general nuclear medicine( think atoms)
NaI doped with TL
PET requires higher density and a
shorter decay time
using an uptake probe as the distance of a source moves closer the counts will?
the nmt is asked to set a 16% symmetrical window around the main energy of I-131 at what range will you set the window?
determine the percent energy resolution for Cs-137 when the energy spread at half max is 642kev to 682kev. Is the instrument performing within standard limits?
yes 8-12% limits
determin well counter efficiency for I131 abundance 83.8% at364kev if a source is 7.8uci and 256,000com.
what is the %SD at 95% confidence level if 13,500 counts are obtained?
calculate the range of values covered by 3SD or 99% confidence interval for 12,500cts.
cameras that use either semiconductors or scintillators auch as CZT for lighr production are called
collimator with holes which are at an angle to match organ position that generates an oblique view for better visualization is called?
an example of a flat field collimator which has one wide hole that shields the detector from stray gamma rays
daily assessment to measure the cameras ability to produce uniform images is called
uniformity, extrinsic or intrinsic
list four collimator charcteristics
outer lead casing, lead septa, thickness, angle, bores diameter, radionuclide energy, positioning
calculate the sensitivity of a gamma camera that produces a counting rate of 42215cpm with a 130uci source and a bkg of 1036cpm
detected count rate per unit activity high sensitivity is desirable in order to improve detectability of small lesions.
FWHM is greatly improved over scintillation detectors
determines ability to accurately determine a lesions location
T/F semiconductor radiaton detectors have much better energy resolution than scintillation detectors
based on clarks formula howmany millicuries should a 95-lb child receive if the adult dosage is 20mci
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