NUCLEAR MEDICINE
INSTRUMENTATION EXAM QUESTIONS
AND ANSWERS 100% PASS
Radiation exposure rates are measured by - CORRECT ANSWER:-Survey meters
Contamination surveys can be performed with - CORRECT ANSWER:-A Geiger
Muller counter
A Geiger Muller counter is appropriate for contamination surveys because it -
CORRECT ANSWER:-Has a rapid response time and can detect a wide range of
exposure rates
A Geiger Muller counter meets the NRC requirement for facilities to have -
CORRECT ANSWER:-A survey meter capable of detecting exposure rates from
0.1 millirems per hour to one hundred millirems per hour
GM counters may be fitted with - CORRECT ANSWER:-An end window probe
or a pancake probe
The pancake probe - CORRECT ANSWER:-Allows the technologist to survey a
larger area
,The end window probe - CORRECT ANSWER:-must be pointed directly at a
source for accurate detection
Portable ionization chambers are also known as - CORRECT ANSWER:-Cutie
pies
Cutie pies or portable ionization chambers vs Geiger Muller counters - CORRECT
ANSWER:-Geiger Muller counters are more sensitive. Cutie pies are more
accurate
The cutie pie is more accurate because - CORRECT ANSWER:-It has a longer
response time so the exposure rate is calculated based on more data
The cutie pie is superior in measuring - CORRECT ANSWER:-High dose rates
such as those in patient doses, especially therapeutic doses
A well counter works by - CORRECT ANSWER:-Using a Thallium activated
sodium iodide crystal to detect low levels of radioactivity
Compared to a gamma camera a well counter is - CORRECT ANSWER:-More
efficient
The well counter's sensitivity limits the instruments use because - CORRECT
ANSWER:-Activities greater than two microcuries can cause coincidence loss
When too many photons strike the crystal in a well counter - CORRECT
ANSWER:-Counts are lost while the instrument is in deadtime
, If the counting rate is very high in a well counter - CORRECT ANSWER:-It may
cause perpetual deadtime paralysis
The well counter is used for - CORRECT ANSWER:-Wipe tests to detect very
low levels of removable contamination
Well counter use in non imaging studies - CORRECT ANSWER:-used to count
blood plasma and urine samples when Standards for blood volume or Schilling
tests are diluted to a known percentage of the original patient dosage
Uptake probe - CORRECT ANSWER:-Uses a sodium iodide crystal to quantitate
activity within a patient. May be connected to the spectrometer used by the well
counter
The uptake probe is not as sensitive as the well counter because of - CORRECT
ANSWER:-Detector to source geometry
Uptake probe uses what kinds of collimator - CORRECT ANSWER:-A cylinder
shaped collimator which limits the Area seen the crystal and eliminates background
activity
The standard used for thyroid uptake studies - CORRECT ANSWER:-The
patient's capsule or another capsule prepared at the same time and activity.
Dilution not required for uptake probe
Splenic sequestration studies use what counter - CORRECT ANSWER:-The
uptake probe
INSTRUMENTATION EXAM QUESTIONS
AND ANSWERS 100% PASS
Radiation exposure rates are measured by - CORRECT ANSWER:-Survey meters
Contamination surveys can be performed with - CORRECT ANSWER:-A Geiger
Muller counter
A Geiger Muller counter is appropriate for contamination surveys because it -
CORRECT ANSWER:-Has a rapid response time and can detect a wide range of
exposure rates
A Geiger Muller counter meets the NRC requirement for facilities to have -
CORRECT ANSWER:-A survey meter capable of detecting exposure rates from
0.1 millirems per hour to one hundred millirems per hour
GM counters may be fitted with - CORRECT ANSWER:-An end window probe
or a pancake probe
The pancake probe - CORRECT ANSWER:-Allows the technologist to survey a
larger area
,The end window probe - CORRECT ANSWER:-must be pointed directly at a
source for accurate detection
Portable ionization chambers are also known as - CORRECT ANSWER:-Cutie
pies
Cutie pies or portable ionization chambers vs Geiger Muller counters - CORRECT
ANSWER:-Geiger Muller counters are more sensitive. Cutie pies are more
accurate
The cutie pie is more accurate because - CORRECT ANSWER:-It has a longer
response time so the exposure rate is calculated based on more data
The cutie pie is superior in measuring - CORRECT ANSWER:-High dose rates
such as those in patient doses, especially therapeutic doses
A well counter works by - CORRECT ANSWER:-Using a Thallium activated
sodium iodide crystal to detect low levels of radioactivity
Compared to a gamma camera a well counter is - CORRECT ANSWER:-More
efficient
The well counter's sensitivity limits the instruments use because - CORRECT
ANSWER:-Activities greater than two microcuries can cause coincidence loss
When too many photons strike the crystal in a well counter - CORRECT
ANSWER:-Counts are lost while the instrument is in deadtime
, If the counting rate is very high in a well counter - CORRECT ANSWER:-It may
cause perpetual deadtime paralysis
The well counter is used for - CORRECT ANSWER:-Wipe tests to detect very
low levels of removable contamination
Well counter use in non imaging studies - CORRECT ANSWER:-used to count
blood plasma and urine samples when Standards for blood volume or Schilling
tests are diluted to a known percentage of the original patient dosage
Uptake probe - CORRECT ANSWER:-Uses a sodium iodide crystal to quantitate
activity within a patient. May be connected to the spectrometer used by the well
counter
The uptake probe is not as sensitive as the well counter because of - CORRECT
ANSWER:-Detector to source geometry
Uptake probe uses what kinds of collimator - CORRECT ANSWER:-A cylinder
shaped collimator which limits the Area seen the crystal and eliminates background
activity
The standard used for thyroid uptake studies - CORRECT ANSWER:-The
patient's capsule or another capsule prepared at the same time and activity.
Dilution not required for uptake probe
Splenic sequestration studies use what counter - CORRECT ANSWER:-The
uptake probe
