NUCS Flashcards
Tc99m (T1/2 and Energy)
6hrs
140 keV
Tc99m (Prod and Decay)
Generator
Isomeric Transition
Xe 133 (T1/2 and Energy)
5.3 days
81 keV
Tl 201 (T1/2 and Energy)
73 hours
69-81 keV
In-111 (T1/2 and Energy)
67 hours
172/247 keV
Ga-67 (T1/2 and Energy)
78 hours
90, 190, 290 keV
I-123 (T1/2 and Energy)
13 hours
159 keV
I-131 (T1/2 and Energy)
8 days
364 (G) and 606 (B)
F18 (T1/2 and Energy)
110 minutes
511
Max Mo in Tc? Term?
0.15 micro Ci per 1 mCi of Tc (UNITS!)
Radionuclide purity
Max Al contamination in Tc? Term?
<10 mcg Al per 1mL
Chemical purity
How can aluminum contamination show up on a
1) free Tc scan
2) Sulfer Colloid scan
1) Liver activity
2) Lung activity
Happens bc Al clumps the tech
How much free Tc in 1) Na99mTc 2) 99mTc Sulfer Colloid 3) All other Tc products Term?
1) 95%
2) 92%
3) 91%
Radiochemical Purity
Formula for effective half life
1/Eff = 1/Phys + 1/Biol
If using two tracers in the same patient/study, what order should they be used in ?
Lower energy tracer first to prevent downscatter from muddying the picture
How often is gamma camera field uniformity (flood) performed for 1)extrinsic and 2)intrinsic evaluation?
Extrinsic is daily and includes the collimator
Intrinsic is weekly and does not use collimator
How often is gamma camera energy window tested?
Daily
How often is gamma camera linearity tested?
Weekly
How often is gamma camera center of rotation tested?
Monthly
How often is gamma camera spatial resolution tested?
Weekly
What is the maximum accurately detectable dose by a Geiger counter?
100mR/h
What is the detectable range for an ionization chamber?
0.1-100R/h (note units, this R/h vs mR/h for Geiger)
What type of instrument is a dose calibrator?
Ionization chamber