Waterstram Rich :Nuclear Medicine and
PET/CT:Technology and Techniques,8th Edition
GradedA+(2024 -2025)
MULTIPLE CHOICE
Positron decay or emission is when a _______________ is converted
to a neutron, a positron, a neutrino, and energy.
proton
Annihilation of a electron and a positron results in a pair of
_________________ gamma rays traveling ___________ degrees.
0.511 MeV; 180 °
F-18 is an example of __________________ decay process.
Positron
X-rays and Gamma-rays have the same characteristics, but they are
named based on their origin.
X-rays are emitted from the electron shells, where gamma-rays are
emitted from the _____________.
nucleus
, A dose of Tc-99m has an activity of 26.3 mCi at 10:30. What is it's
activity at 14:10?
17.2 mCi
A dose of F-18 FDG is 15 mCi at 8:45. What is it's activity at 10:20?
8.2 mCi
The decay factor for Tc-99m at 2 hours is: __________________.
0.794
Beta particle emitting radionuclides should not be shielded by a high-
Z material (such as lead) because _________________________
interactions are likely to occur.
Bremsstrahlung
What type of interaction occurs when a weak photon gives all of its
energy to an inner shell electron?
Photoelectric effect
An attenuator that is equivalent to 4 half value layers would reduce
the radiation to ______ of its original strength.
6.25%
10mCi is equal to how many becquerels?
PET/CT:Technology and Techniques,8th Edition
GradedA+(2024 -2025)
MULTIPLE CHOICE
Positron decay or emission is when a _______________ is converted
to a neutron, a positron, a neutrino, and energy.
proton
Annihilation of a electron and a positron results in a pair of
_________________ gamma rays traveling ___________ degrees.
0.511 MeV; 180 °
F-18 is an example of __________________ decay process.
Positron
X-rays and Gamma-rays have the same characteristics, but they are
named based on their origin.
X-rays are emitted from the electron shells, where gamma-rays are
emitted from the _____________.
nucleus
, A dose of Tc-99m has an activity of 26.3 mCi at 10:30. What is it's
activity at 14:10?
17.2 mCi
A dose of F-18 FDG is 15 mCi at 8:45. What is it's activity at 10:20?
8.2 mCi
The decay factor for Tc-99m at 2 hours is: __________________.
0.794
Beta particle emitting radionuclides should not be shielded by a high-
Z material (such as lead) because _________________________
interactions are likely to occur.
Bremsstrahlung
What type of interaction occurs when a weak photon gives all of its
energy to an inner shell electron?
Photoelectric effect
An attenuator that is equivalent to 4 half value layers would reduce
the radiation to ______ of its original strength.
6.25%
10mCi is equal to how many becquerels?
