Physics Nucs Flashcards
Tc 99 1/2
6 hours
I 123 1/2
13 hours
I 131 half
8 days
indium, gallium thallium
about 3 days
xe 133 1/2 life
5 days
f 18 half life
110 minutes
tc 99m photon energy
140 kev
I 123 photon energy
159 kev
I 131 energy
365
Ga 67 energy
100, 200, 300, 400
Pet agent photon energy
511
thallium photon energy
80
upper limit allowed for molybdenum breakthrough
0.15 microCI Mo per Tc 99m
upper limit Al allowed
10 microgram Al per mL of Tc 99m eluate
extrinsic uniformity with collimator terst how often
daily
photopeaking test how often
daily
intrinsic uniformity test how often
weekly
bar phantom
weekly
center of rotation test
monthly
jascszak phantom test
quarterly
What two agents are transient perfusion agents and used for cerebral vasculature?
Tc 99m DTPA
Tc 99 pertechnetate
What two agents are lipophilic and used to image brain parenchyma?
Tc 99m HMPAO
Tc 99m ECD
what agent is used to evaluate NPH?
Indium 111 DTPA
What agent is used to evaluate shunt patency?
Tc 99m DTPA
What two agents are used for seizure imaging?
Tc 99m HMPAO & ECD
what is a beta particle
electron that came out of the nucleus
short septa characteristics
sensitivty but bad resolution
what kind of septa and holes to use for high energy?
thin septa, wide holes
what kind of septa and holes for lower energy?
thick septa narrow holes
magnification=
F/B
F=distance form pinhole to detector
B pinhole to patient
what is a scintillation crystal made of
sodium iodine with thallium
thick crystal has what effect on sensitivty and spatial resolution
increased sensitivity
worse spatial resolution
what does a scintillation crystal do?
struck by phton and produces light
what is the purpose of a PMT
converts light to electric signal
what is the function of a pulse height analyzer
eleimated background
What causes star artifact?
septal penetration of hexagonal collimator holes
what percentage of non uniformity is allowed?
2-5 percent
device used to detect small amounts of contamination
geiger muller counter
what is the max dose GM can handle
100 mr/h
consistency checked
daily
linearity checked
quarterly
accuracy checked
at installation and annually
geometry checked
at instillation and any time device moved
major spill of tc 99
100 mci
major spill of thallium
100 mci
major spill of indium
10 mci
major spill of I 123
10 mci
major spill of gallium
10mci
major spill of I 131
1
Wipe test does not work on what?
xenon
annual dose limit of public
100mrem
mrem per hour in unrestrited area
2
radiation area= what radiation at 1 hour at 30cm
0.005 rem or 0.05msv
high radiation area
0.1rem or 1 msv in 1 hr at 30cm
1 rad quals how many rem
1
1 rad equals how many gray
0.01
1msv = how many mrem
100
1 msv = how many rem
0.1
