Nuclear Medicine Flashcards
1
Q
What type of decay does I-131 undergo?
A
Beta minus
Emits a principal primary gamma photon
2
Q
What is the energy and half life of the I-131 principal primary gamma photon?
A
364 keV
8.1 day physical half-life
3
Q
How does I-123 decay?
A
Electron capture
4
Q
What energy does the I-123 principal emission have?
A
159 keV gamma photon
This is well suited for imaging on gamma camera imaging
5
Q
If I-131 is used for uptake imaging, why is the dose significantly decreased?
A
The ß-emission from I-131 could causing stunning of residual cells in thyroid cancer.
This prevents uptake for effective therapy or future imaging.
I-123 does not cause stunning.
6
Q
What is the energy and half life of I-123?
A
Photon energy = 159 keV
Physical t1/2 = 13.2 hours
7
Q
A
