6. The Mo/Tc generator is
eluted with...
0.001M
hydrochloric acid
Sterile
distilled water
Physiological
saline
None
of the above
7. We analyze the generator
eluate for impurities. These include...
Free
Tc, Al3+ ion, Mo99
Free
Tc, Mo99, Hydrolyzed Reduced Tc
Perchlorate,
molybdate
Al3+,
Mo99, Hydrolyzed Reduced Tc
8. After a molybdenum99/technetium99m
generator is eluted with typical efficiency, the in-growing Tc99m
reaches a maximum at...
At
about 2 hours
Between
2 and 6 hours
Between
12 and 24 hours
Only
after 30 hours
9. In an equilibrium
mixture of parent molybdenum99 and daughter Tc99m, the
ratio of Tc99m activity to Mo99 activity is:
About
0.7
About
1.5
Greater
than 2
About
1.1
10. Tc99m
formed in the Mo/Tc generator decays to radioactive Tc99g which has
a half life of 2.1 x105 years. Tc99g does not contribute
significantly to absorbed dose in in vivo procedures because:
The
number of atoms of Tc99g is small compared with the number of atoms
of Tc99m
Tc99g
does not emit particulate radiation as it decays
It
is rapidly cleared from the body
The
activity of Tc99g is small compared with the activity of Tc99m
11. Which one of
the following is essential for a practical laboratory radionuclide
generator?
Daughter
must have a longer half-life than parent
Daughter
must have a shorter half-life than parent
Daughter
half-life must not be less than one hour
Parent
must not decay to daughter by isobaric transition
12.
In
the Mo/Tc generator, the elution of technetium by saline solution produces a
separation from molybdenum because...
The
molybdenum is in the form of insoluble metal
The
molybdenum chloride is insoluble
The
molybdate is absorbed on alumina, whereas pertechnetate is not
None
of the above
13.
What is the limit of
aluminum ion concentration in Na pertechnetate solution produced by a fission
Mo generator?
l00
цg per ml
20
цg per ml
l0
цg per ml
2
цg per ml
14.
The radionuclide
impurities in Tc-99m pertechnetate eluate can be determined by...?
GM
counter
Thin
Layer Chromatography
Dose
Calibrator
Cutie
Pie
15.
The legal limit for
Mo-99 breakthrough is...
1
цCi
Mo99/mCi
Tc99m
at time of elution
1
цCi
Mo99/mCi
Tc99m
at time of injection
0.15
цCi
Mo99/mCi
Tc99m
at time of elution
0.15
цCi
Mo99/mCi Tc99m at time of administration
16.
The
Tc99m eluate at 7:00 A.M. this morning had a ratio of 0.10 mCi Mo99/mCi
Tc99m. Which one of the following is true?
This
ratio decreases as a function of time
If
the generator were eluted again at 8:00 A.M., no activity would be obtained
Most
departments determine this ratio using a radioisotope dose calibrator
Equilibrium
is reached 12 hours after the previous elution
17.
For the existence of
radioactive equilibrium...
Half-life
of the parent must be greater than the half-life of the daughter
Daughter
must decay by isomeric transition
Parent
must decay by beta-minus decay
Daughter
must be stable
18.
In transient
equilibrium, the ratio of parent’s half-life to daughter’s half-life is
approximately
1
10
50
1000
19.
A Mo99/Tc99m
generator has a useful life of
1
Day
1
Week
2
Weeks
1
Month
20.
The cylindrical lead
shielding in a Mo/Tc generator is 2 inches thick and weighs approximately 48
pounds. This large quantity of lead is required to shield...
The
Tc99m
The
Mo99
Both
the Mo and the Tc
Neither
of these isotopes
