IRRSP LATEST 2026 EXAM QUESTIONS AND ANSWERS
GRADED A+
✔✔Protons - ✔✔Positively charged elementary particles with a mass approximately
equal to 1840 times that of an electron, or 1 AMU, are known as:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells
✔✔Neutrons - ✔✔Unchanged elementary particles with a mass nearly equal to that of a
proton are called:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells
✔✔Nucleus - ✔✔The area known as the center of an atom is called the:
a. Electron
b. Nucleus
c. Proton
d. Neutron
✔✔Sealed source - ✔✔Any byproduct material that is encased in a capsule designed to
prevent leakage or escape of the byproduct material is a:
a. Drum
b. Pig
c. Sealed source
d. Container
✔✔S tube - ✔✔A tube through which the radioactive source travels when inside a
radiographic exposure device is a/an:
a. Port tube
b. Guide tube
c. S tube
d. Exit tube
✔✔B - ✔✔Survey meters must be calibrated at intervals not to exceed: (Answer with A,
B, C, or D)
a. Three months and/or after instrument servicing except for battery changes
b. Six months and/or after instrument servicing except for battery changes
c. Annually and after instrument servicing except for battery changes
d. Daily and after instrument servicing except for battery changes
,✔✔D - ✔✔A survey meter must be capable of measuring a range of: (Answer with A, B,
C, or D)
a. 0 to 1000 mR/hr
b. 2 to 1000 R/hr
c. 0 to 1000 R/hr
d. 2 to 1000 mR/hr
✔✔Activity - ✔✔Becquerels and curies are units of measurement of:
a. Physical size of the source
b. Activity
c. Gray per hour
d. Roentgen per hour
✔✔A - ✔✔An analog survey meter must be calibrated on each scale at two points
approximately:
(Answer with A, B, C, or D)
a. 33% and 66% of the scale's potential
b. 25% and 75% of the scale's potential
c. Through the full range of the scale's potential
d. At the midpoint of the scale's potential
✔✔Ionization - ✔✔The process that results in the removal of orbital electrons from
atoms resulting in the formation of ion pairs is called:
a. Excitation
b. Radioactivity
c. Decay
d. Ionization
✔✔Detection equipment - ✔✔The fact that gasses bombarded by ionizing radiation
become conductors of electrical current make them useful in:
a. X ray transformers
b. Cathode tubes
c. Detection equipment
d. Gasses cannot conduct electrical charges
✔✔B - ✔✔A dosimeter must be capable of reading a range of:
(Answer with A, B, C, or D)
a. 0-100 mR
b. 0-200 mR
c. 0-500 mR
d. 0-1 R
✔✔200 mR - ✔✔Pocket ion chambers must be capable of reading:
a. 100 mR
b. 500 mR
,c. 200 mR
d. 999 mR
✔✔Survey meter - ✔✔An exposure rate is measured by:
a. Survey meter
b. Dosimeter
c. Rate alarm
d. Film badge/TLD
✔✔TLDs - ✔✔What dosimeters (dosimeter devices) are least affected by moisture?
a. Digital dosimeters
b. Film badges
c. TLDs
d. Ion chambers
✔✔B - ✔✔Full deflection of a survey meter while on battery check means: (Answer with
A, B, C, or D)
a. Meter is working properly and has good batteries
b. Meter may or may not be working properly
c. Meter is working properly and battery strength is not an issue
d. Meter is unusable
✔✔Annually - ✔✔Dosimeters must be calibrated at intervals not to exceed:
a. Three months
b. Six months
c. Biannually
d. Annually
✔✔Yearly - ✔✔Rate alarms must be calibrated at intervals not to exceed:
a. Yearly
b. Quarterly
c. Monthly
d. Biannually
✔✔Total dose history for the period worn - ✔✔A film badge/TLD records what?
a. Dose rate
b. Exposure rate
c. Total dose history for the period worn
d. Daily dose
✔✔Rate alarm - ✔✔When performing radiography in a permanent radiographic
installation equipped with an area monitor, the technician is not required to wear/use:
a. Survey meter
b. Film badge/TLD
c. Rate alarm
, d. Dosimeter
✔✔Immediate dose history since last time charged - ✔✔A direct reading ionization
chamber, such as a dosimeter, has the advantage of providing an:
a. Accurate dose history for the month
b. Immediate dose history since last time charged
c. Accurate dose rate
d. Immediate dose rate
✔✔D - ✔✔A radiographer's survey meter is showing 0 near the source; it can safely be
assumed that:
(Answer with A, B, C, or D)
a. There is no radiation present
b. The meter is inoperable and should be repaired when the shift is over
c. The meter may be inoperable and a replacement should be used immediately
d. The meter is in an inoperable state; the radiographer should retreat from the source
until an operational meter has replaced the suspect meter
✔✔75 mR/hr - ✔✔A radiographer reads 7.5 on the 10x scale of the survey meter. What
is the current dose rate at that position?
a. 7.5 mR/hr
b. 75 mR/hr
c. 750 mR/hr
d. 7.5 R/hr
✔✔1.6% - ✔✔After 6 half-value layers, what percentage of radiation would be received?
a. 50%
b. 25%
c. 8%
d. 1.6%
✔✔60 years - ✔✔Assuming a source has a half-life of 20 years, how old would the
source be in 3 half-lives?
a. 20 years
b. 40 years
c. 60 years
d. 120 years
✔✔15 mR - ✔✔If a radiographer has 60 mR at the surface of the exposure device, what
would the reading be after 2 half-lives?
a. 15 mR
b. 40 mR
c. 80 mR
d. 10 mR
GRADED A+
✔✔Protons - ✔✔Positively charged elementary particles with a mass approximately
equal to 1840 times that of an electron, or 1 AMU, are known as:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells
✔✔Neutrons - ✔✔Unchanged elementary particles with a mass nearly equal to that of a
proton are called:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells
✔✔Nucleus - ✔✔The area known as the center of an atom is called the:
a. Electron
b. Nucleus
c. Proton
d. Neutron
✔✔Sealed source - ✔✔Any byproduct material that is encased in a capsule designed to
prevent leakage or escape of the byproduct material is a:
a. Drum
b. Pig
c. Sealed source
d. Container
✔✔S tube - ✔✔A tube through which the radioactive source travels when inside a
radiographic exposure device is a/an:
a. Port tube
b. Guide tube
c. S tube
d. Exit tube
✔✔B - ✔✔Survey meters must be calibrated at intervals not to exceed: (Answer with A,
B, C, or D)
a. Three months and/or after instrument servicing except for battery changes
b. Six months and/or after instrument servicing except for battery changes
c. Annually and after instrument servicing except for battery changes
d. Daily and after instrument servicing except for battery changes
,✔✔D - ✔✔A survey meter must be capable of measuring a range of: (Answer with A, B,
C, or D)
a. 0 to 1000 mR/hr
b. 2 to 1000 R/hr
c. 0 to 1000 R/hr
d. 2 to 1000 mR/hr
✔✔Activity - ✔✔Becquerels and curies are units of measurement of:
a. Physical size of the source
b. Activity
c. Gray per hour
d. Roentgen per hour
✔✔A - ✔✔An analog survey meter must be calibrated on each scale at two points
approximately:
(Answer with A, B, C, or D)
a. 33% and 66% of the scale's potential
b. 25% and 75% of the scale's potential
c. Through the full range of the scale's potential
d. At the midpoint of the scale's potential
✔✔Ionization - ✔✔The process that results in the removal of orbital electrons from
atoms resulting in the formation of ion pairs is called:
a. Excitation
b. Radioactivity
c. Decay
d. Ionization
✔✔Detection equipment - ✔✔The fact that gasses bombarded by ionizing radiation
become conductors of electrical current make them useful in:
a. X ray transformers
b. Cathode tubes
c. Detection equipment
d. Gasses cannot conduct electrical charges
✔✔B - ✔✔A dosimeter must be capable of reading a range of:
(Answer with A, B, C, or D)
a. 0-100 mR
b. 0-200 mR
c. 0-500 mR
d. 0-1 R
✔✔200 mR - ✔✔Pocket ion chambers must be capable of reading:
a. 100 mR
b. 500 mR
,c. 200 mR
d. 999 mR
✔✔Survey meter - ✔✔An exposure rate is measured by:
a. Survey meter
b. Dosimeter
c. Rate alarm
d. Film badge/TLD
✔✔TLDs - ✔✔What dosimeters (dosimeter devices) are least affected by moisture?
a. Digital dosimeters
b. Film badges
c. TLDs
d. Ion chambers
✔✔B - ✔✔Full deflection of a survey meter while on battery check means: (Answer with
A, B, C, or D)
a. Meter is working properly and has good batteries
b. Meter may or may not be working properly
c. Meter is working properly and battery strength is not an issue
d. Meter is unusable
✔✔Annually - ✔✔Dosimeters must be calibrated at intervals not to exceed:
a. Three months
b. Six months
c. Biannually
d. Annually
✔✔Yearly - ✔✔Rate alarms must be calibrated at intervals not to exceed:
a. Yearly
b. Quarterly
c. Monthly
d. Biannually
✔✔Total dose history for the period worn - ✔✔A film badge/TLD records what?
a. Dose rate
b. Exposure rate
c. Total dose history for the period worn
d. Daily dose
✔✔Rate alarm - ✔✔When performing radiography in a permanent radiographic
installation equipped with an area monitor, the technician is not required to wear/use:
a. Survey meter
b. Film badge/TLD
c. Rate alarm
, d. Dosimeter
✔✔Immediate dose history since last time charged - ✔✔A direct reading ionization
chamber, such as a dosimeter, has the advantage of providing an:
a. Accurate dose history for the month
b. Immediate dose history since last time charged
c. Accurate dose rate
d. Immediate dose rate
✔✔D - ✔✔A radiographer's survey meter is showing 0 near the source; it can safely be
assumed that:
(Answer with A, B, C, or D)
a. There is no radiation present
b. The meter is inoperable and should be repaired when the shift is over
c. The meter may be inoperable and a replacement should be used immediately
d. The meter is in an inoperable state; the radiographer should retreat from the source
until an operational meter has replaced the suspect meter
✔✔75 mR/hr - ✔✔A radiographer reads 7.5 on the 10x scale of the survey meter. What
is the current dose rate at that position?
a. 7.5 mR/hr
b. 75 mR/hr
c. 750 mR/hr
d. 7.5 R/hr
✔✔1.6% - ✔✔After 6 half-value layers, what percentage of radiation would be received?
a. 50%
b. 25%
c. 8%
d. 1.6%
✔✔60 years - ✔✔Assuming a source has a half-life of 20 years, how old would the
source be in 3 half-lives?
a. 20 years
b. 40 years
c. 60 years
d. 120 years
✔✔15 mR - ✔✔If a radiographer has 60 mR at the surface of the exposure device, what
would the reading be after 2 half-lives?
a. 15 mR
b. 40 mR
c. 80 mR
d. 10 mR
