Exam (elaborations)
NMTCB QUESTIONS WITH SOLUTIONS 2024
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Exam of 4 pages for the course NMTCB at NMTCB (NMTCB)
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NMTCBA vial of 125I for radioimmunoassay has radioactivity of 30 kBq. What is the activity in
uCi? - answer.81uCi
The radio pharmacy receives I-131 in solution at an activity concentration of 1300
mCi/mL. What is its strength in GBq/mL? - answer
A technologist's ring dosimeter reading for one month is 750 mrem. Convert to mSv. -
answer7.5 mSv
A patient is scheduled for a cistern gram, and a vial of 111In‐DTPA containing 30 MBq
is received on the day the injection is scheduled. But the patient's wife calls to ask if he
can reschedule for a later date. What is the last day that the vial will still contain 20 MBq
of 111In for his dose? - answer
A pharmacist receives an order for 25 mCi 99mTc‐HDP, for 11 AM. The HDP kit was
prepared to be 50 mCi/mL at 7 AM. How much should he withdraw for the dose? -
answer.79mL
A 140‐keV gamma ray undergoes a Compton scattering event, with a scattering angle
of 60. What is the energy of the scattered gamma ray? - answer84
In a PET scanner, if one wishes to set the PHA window to exclude all gamma rays
below the Compton edge, the lower level discriminator or baseline should be set at ___
keV. - answer
The following counting measurements are made: Sample - 10,229 cts in 3 min
Background - 358 cts in 5 min Determine a) the net count rate and b) the standard
deviation of the net count rate. - answera)3,334 cts/min
The gamma constant for 64Cu is 1.2 R‐cm2/mCi‐hr. What is the expected radiation
exposure rate at 1 meter from a 12‐mCi 64Cu PET dose? - answer
The exposure rate from a patient who has received a radioactive iodine therapy dosage
is 20 mR/hr at 1 meter. If the distance is increased to 4 meters from the patient, and
assuming that the radiation level follows the inverse‐square law, what would the
exposure rate be? - answer
Lead has a linear attenuation coefficient of approximately 25 cm‐1 for the 140 keV
gamma ray of 99mTc. What fraction of the gamma rays will pass through a shield
constructed with 0.8 mm of lead? - answer
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