Exam 3 Instrumentation questions
well answered already passed
10 mCi is equal to how many becquerels? - correct answer ✔✔ b.
370 MBq
20 mCi is equal to how many becquerels? - correct answer ✔✔ .
0.74 GBq
30% of 7 ml = - correct answer ✔✔ 2.10 ml
99Rh, 99Rh, 99Rh, 99Rh, 99Rh are examples of: - correct answer ✔✔ isobars
A 5-ml sample of a standard diluted 1:10,000 produces 27,200 counts in the well counter. A 5-
ml sample of patient plasma, counted for the same time as the diluted standard sample,
produces 99,100 counts. What is the plasma volume? - correct answer ✔✔ 2.74 liter
A 99Mo/99mTc generator is calibrated for 1.00 Ci of 99Mo at 7 AM Monday. The generator is
eluted daily Monday through Friday at 8:00 AM , but the workload is especially heavy on Friday
so the generator is eluted again at 3:00 PM to obtain more 99mTc. Assuming 100% elution
efficiency, how many mCi of 99mTc will be eluted at 3:00 PM Friday? - correct answer ✔✔ 160
mCi
A 99Mo/99mTc generator is eluted Monday at 7:00 AM , producing 1.8 Ci of 99mTc in the eluate
vial, in 20 ml saline. What volume of eluate should be withdrawn from the eluate vial into a
syringe in order to inject a patient with 20 mCi of 99mTc at 3:00 PM ? (Given the of 9mTc is 6.02
hours.) - correct answer ✔✔ 0.56 ml
, A Cs-137 source is counted in a dose calibrator daily and the activity is monitored. What aspect
of the equipment's performance is being checked? - correct answer ✔✔ Constancy
A beta-minus particle is the same as a(n): - correct answer ✔✔ electron
A long-lived radioactive source is counted for 1 minute and yields 10,000 counts. If this source is
counted immediately again, there is a 95% probability that the result will be in the range: -
correct answer ✔✔ 9800 to 10,200
A low-pass filter: - correct answer ✔✔ a.
allows low frequencies to pass and blocks higher ones
A patient may had a kidney function test last month that showed a kidney clearance rate of 45
milliliters per minute (ml/min). The patient returns today and has a kidney clearance rate of 60
ml/min. What is the percent increase in kidney function? - correct answer ✔✔ 33%
A patient was injected with 131I on Monday at 10:00 AM . On Tuesday at 10:00 AM , the thyroid
probe was placed over the thyroid and produced 100,000 counts. On Thursday at 10:00 AM ,
the probe showed 25,000 counts. What is the effective half-life in this patient's thyroid? -
correct answer ✔✔ 24 hr
A radioactive source decays from 20 mCi to 2.5 mCi in 18 hours. What is the physical half-life? -
correct answer ✔✔ 6 hr
A radioactive source of 137Cs ( = 30 y) was calibrated on October 23, 2000 to contain 10 mCi.
This is used as a daily accuracy check source in the dose calibrator. Presuming the dose
calibrator is working properly, what activity should the dose calibrator show on April 23, 2006? -
correct answer ✔✔ 8.8 mCi
well answered already passed
10 mCi is equal to how many becquerels? - correct answer ✔✔ b.
370 MBq
20 mCi is equal to how many becquerels? - correct answer ✔✔ .
0.74 GBq
30% of 7 ml = - correct answer ✔✔ 2.10 ml
99Rh, 99Rh, 99Rh, 99Rh, 99Rh are examples of: - correct answer ✔✔ isobars
A 5-ml sample of a standard diluted 1:10,000 produces 27,200 counts in the well counter. A 5-
ml sample of patient plasma, counted for the same time as the diluted standard sample,
produces 99,100 counts. What is the plasma volume? - correct answer ✔✔ 2.74 liter
A 99Mo/99mTc generator is calibrated for 1.00 Ci of 99Mo at 7 AM Monday. The generator is
eluted daily Monday through Friday at 8:00 AM , but the workload is especially heavy on Friday
so the generator is eluted again at 3:00 PM to obtain more 99mTc. Assuming 100% elution
efficiency, how many mCi of 99mTc will be eluted at 3:00 PM Friday? - correct answer ✔✔ 160
mCi
A 99Mo/99mTc generator is eluted Monday at 7:00 AM , producing 1.8 Ci of 99mTc in the eluate
vial, in 20 ml saline. What volume of eluate should be withdrawn from the eluate vial into a
syringe in order to inject a patient with 20 mCi of 99mTc at 3:00 PM ? (Given the of 9mTc is 6.02
hours.) - correct answer ✔✔ 0.56 ml
, A Cs-137 source is counted in a dose calibrator daily and the activity is monitored. What aspect
of the equipment's performance is being checked? - correct answer ✔✔ Constancy
A beta-minus particle is the same as a(n): - correct answer ✔✔ electron
A long-lived radioactive source is counted for 1 minute and yields 10,000 counts. If this source is
counted immediately again, there is a 95% probability that the result will be in the range: -
correct answer ✔✔ 9800 to 10,200
A low-pass filter: - correct answer ✔✔ a.
allows low frequencies to pass and blocks higher ones
A patient may had a kidney function test last month that showed a kidney clearance rate of 45
milliliters per minute (ml/min). The patient returns today and has a kidney clearance rate of 60
ml/min. What is the percent increase in kidney function? - correct answer ✔✔ 33%
A patient was injected with 131I on Monday at 10:00 AM . On Tuesday at 10:00 AM , the thyroid
probe was placed over the thyroid and produced 100,000 counts. On Thursday at 10:00 AM ,
the probe showed 25,000 counts. What is the effective half-life in this patient's thyroid? -
correct answer ✔✔ 24 hr
A radioactive source decays from 20 mCi to 2.5 mCi in 18 hours. What is the physical half-life? -
correct answer ✔✔ 6 hr
A radioactive source of 137Cs ( = 30 y) was calibrated on October 23, 2000 to contain 10 mCi.
This is used as a daily accuracy check source in the dose calibrator. Presuming the dose
calibrator is working properly, what activity should the dose calibrator show on April 23, 2006? -
correct answer ✔✔ 8.8 mCi
