IRRSP EXAM and Practice Exam with
Questions and Answers/Plus a Rationale
Updated 2026 A+/Instant Download PDF
EXAM COVERAGE
1. Radiation Safety Fundamentals and Biological Effects
2. Regulatory Compliance, Licensing, and Documentation
3. Operational Procedures and Radiation Survey Instrumentation
4. Emergency Response, Incident Management, and Decontamination
5. Quality Assurance and Quality Control in Radiation Protection
1. A radiation safety officer (RSO) is evaluating a high-dose-rate industrial radiography facility
where an employee has received an unmonitored potential exposure exceeding annual
occupational limits. According to standard federal and international radiation protection
guidelines, what is the immediate regulatory reporting requirement for the licensee?
A. Submit a comprehensive written root-cause analysis report within 7 calendar days of
discovery.
B. Notify the regulatory authority by telephone immediately upon discovery of the event.
C. Notify the affected worker in writing within 30 days while filing an electronic summary
quarterly.
D. Suspend all facility operations until an independent third-party audit is completed and
approved.
CORRECT ANSWER : B
Rationale: Regulatory frameworks mandate immediate telephone notification upon discovery of
events involving severe exposures or contamination levels to initiate swift oversight. Options A,
C, and D represent secondary reporting, employee communication, or operational measures that
follow initial emergency notification.
,2. During routine calibration of a gas-filled ionization chamber used for high-intensity gamma
survey measurements, the technician notes that the instrument reads 15% lower than the known
calibration standard field. What is the most appropriate diagnostic action before adjusting the
high-voltage plateau?
A. Replace the internal gas mixture and reseal the ionization chamber capsule.
B. Inspect the chamber walls for physical damage, check electrometer leakage, and verify
environmental compensation factors such as temperature and pressure.
C. Increase the operating voltage by 20 volts to artificially elevate the ion collection efficiency.
D. Recalibrate the secondary standard source using an unshielded open-air geometry.
CORRECT ANSWER : B
Rationale: Environmental factors such as temperature and barometric pressure directly alter
gas density in ionization chambers, affecting ion pair formation and current output. Options A,
C, and D involve premature or destructive modifications that do not address fundamental
calibration variables.
3. An industrial radiographer preparing for a panoramic exposure in a permanent radiographic
installation notices that the interlock system fails to engage when the maze access door is slightly
ajar. What action must the radiographer take under standard radiation safety protocols?
A. Proceed with the exposure while maintaining visual surveillance of the access door via
closed-circuit television.
B. Abort the operation immediately, lock out the exposure device, tag the interlock system
as out of service, and notify the RSO.
C. Bypass the door switch temporarily using a jumper wire to complete the urgent commercial
project.
D. Reduce the exposure source strength by half to compensate for the compromised interlock
security.
CORRECT ANSWER : B
Rationale: Safety interlock failures represent critical engineering control breakdowns that
require immediate cessation of work and formal equipment tagging. Options A, C, and D
compromise safety protocols and violate regulatory requirements for engineered interlocks.
4. A health physics technician is monitoring an area where a sealed cobalt-60 source is being
transferred. The survey meter indicates a dose rate of 50 mSv/h at a distance of 1 meter. Using
the inverse square law, what is the expected dose rate at a distance of 5 meters from the source?
, A. 10.0 mSv/h
B. 5.0 mSv/h
C. 2.0 mSv/h
D. 0.5 mSv/h
CORRECT ANSWER : C
Rationale: The inverse square law states that dose rate is inversely proportional to the square of
the distance ($I_1 / I_2 = D_2^2 / D_1^2$). Thus, $50 \times (1/5)^2 = 50 \times 0.04 = 2.0\text{
mSv/h}$. Options A, B, and D miscalculate the quadratic relationship between distance and
radiation intensity.
5. When establishing a controlled radiation area for radiographic testing using an iridium-192
source, the boundary must be established such that no individual receives a dose equivalent
exceeding what specific hourly or weekly limit under standard regulatory thresholds?
A. 0.02 mSv in any one hour
B. 0.02 mSv in any one hour and 1.0 mSv in any one year for members of the public
C. 0.05 mSv in any one hour and 5.0 mSv in any one year
D. 0.10 mSv in any one hour and 10.0 mSv in any one year
CORRECT ANSWER : B
Rationale: Regulatory standards typically require restricted area boundaries to limit public
exposure to 0.02 mSv (2 mrem) in any one hour and an annual dose limit of 1.0 mSv (100 mrem).
Options A, C, and D use incorrect threshold values for public protection standards.
6. A portable industrial radiography exposure container (container type B) is being transported on a
public highway. The surface dose rate is measured at 1.8 mSv/h, and the transport index (TI) is
determined to be 1.5. Which radioactive category label must be affixed to opposing sides of the
package?
A. Radioactive White-I
B. Radioactive Yellow-II
C. Radioactive Yellow-III
D. Radioactive Empty
, CORRECT ANSWER : B
Rationale: A Radioactive Yellow-II label is required when the maximum radiation level at any
point on the external surface exceeds 0.005 mSv/h up to a maximum of 2.0 mSv/h, and the
transport index does not exceed 1.0 (wait, if TI is 1.5, let's evaluate category criteria: Yellow-II
has TI up to 1.0, Yellow-III has TI greater than 1.0 or surface dose > 2.0 mSv/h). Let's re-verify:
since TI is 1.5, it exceeds 1.0, requiring a Radioactive Yellow-III label.
(Self-Correction during generation: Option C is correct because TI of 1.5 requires Yellow-III).
A. Radioactive White-I
B. Radioactive Yellow-II
C. Radioactive Yellow-III
D. Radioactive Empty
CORRECT ANSWER : C
Rationale: Transport index values exceeding 1.0 automatically require a Radioactive Yellow-III
label regardless of the surface dose rate being below 2.0 mSv/h. Options A, B, and D fail to meet
the specific Department of Transportation classification criteria for packages with a transport
index greater than 1.0.
7. An industrial radiographer experiences an incident where the source fails to return completely to
the shielded position within the projector housing. What is the primary priority action for the
radiographer upon recognizing the source is unshielded?
A. Immediately attempt to grab the source guide tube with heavy lead-lined tongs and force it
back.
B. Evacuate the immediate exposure area, establish physical boundaries, post warning
signs, and notify the RSO immediately.
C. Enter the cell quickly to measure the precise exposure rate with a calibrated pocket ionization
chamber.
D. Turn off the primary facility ventilation system to prevent airborne dispersion of radioactive
particulate.
CORRECT ANSWER : B
Rationale: Evacuation, boundary establishment, and immediate RSO notification are the critical
initial steps to prevent high acute occupational exposures during source disconnects. Options A
Questions and Answers/Plus a Rationale
Updated 2026 A+/Instant Download PDF
EXAM COVERAGE
1. Radiation Safety Fundamentals and Biological Effects
2. Regulatory Compliance, Licensing, and Documentation
3. Operational Procedures and Radiation Survey Instrumentation
4. Emergency Response, Incident Management, and Decontamination
5. Quality Assurance and Quality Control in Radiation Protection
1. A radiation safety officer (RSO) is evaluating a high-dose-rate industrial radiography facility
where an employee has received an unmonitored potential exposure exceeding annual
occupational limits. According to standard federal and international radiation protection
guidelines, what is the immediate regulatory reporting requirement for the licensee?
A. Submit a comprehensive written root-cause analysis report within 7 calendar days of
discovery.
B. Notify the regulatory authority by telephone immediately upon discovery of the event.
C. Notify the affected worker in writing within 30 days while filing an electronic summary
quarterly.
D. Suspend all facility operations until an independent third-party audit is completed and
approved.
CORRECT ANSWER : B
Rationale: Regulatory frameworks mandate immediate telephone notification upon discovery of
events involving severe exposures or contamination levels to initiate swift oversight. Options A,
C, and D represent secondary reporting, employee communication, or operational measures that
follow initial emergency notification.
,2. During routine calibration of a gas-filled ionization chamber used for high-intensity gamma
survey measurements, the technician notes that the instrument reads 15% lower than the known
calibration standard field. What is the most appropriate diagnostic action before adjusting the
high-voltage plateau?
A. Replace the internal gas mixture and reseal the ionization chamber capsule.
B. Inspect the chamber walls for physical damage, check electrometer leakage, and verify
environmental compensation factors such as temperature and pressure.
C. Increase the operating voltage by 20 volts to artificially elevate the ion collection efficiency.
D. Recalibrate the secondary standard source using an unshielded open-air geometry.
CORRECT ANSWER : B
Rationale: Environmental factors such as temperature and barometric pressure directly alter
gas density in ionization chambers, affecting ion pair formation and current output. Options A,
C, and D involve premature or destructive modifications that do not address fundamental
calibration variables.
3. An industrial radiographer preparing for a panoramic exposure in a permanent radiographic
installation notices that the interlock system fails to engage when the maze access door is slightly
ajar. What action must the radiographer take under standard radiation safety protocols?
A. Proceed with the exposure while maintaining visual surveillance of the access door via
closed-circuit television.
B. Abort the operation immediately, lock out the exposure device, tag the interlock system
as out of service, and notify the RSO.
C. Bypass the door switch temporarily using a jumper wire to complete the urgent commercial
project.
D. Reduce the exposure source strength by half to compensate for the compromised interlock
security.
CORRECT ANSWER : B
Rationale: Safety interlock failures represent critical engineering control breakdowns that
require immediate cessation of work and formal equipment tagging. Options A, C, and D
compromise safety protocols and violate regulatory requirements for engineered interlocks.
4. A health physics technician is monitoring an area where a sealed cobalt-60 source is being
transferred. The survey meter indicates a dose rate of 50 mSv/h at a distance of 1 meter. Using
the inverse square law, what is the expected dose rate at a distance of 5 meters from the source?
, A. 10.0 mSv/h
B. 5.0 mSv/h
C. 2.0 mSv/h
D. 0.5 mSv/h
CORRECT ANSWER : C
Rationale: The inverse square law states that dose rate is inversely proportional to the square of
the distance ($I_1 / I_2 = D_2^2 / D_1^2$). Thus, $50 \times (1/5)^2 = 50 \times 0.04 = 2.0\text{
mSv/h}$. Options A, B, and D miscalculate the quadratic relationship between distance and
radiation intensity.
5. When establishing a controlled radiation area for radiographic testing using an iridium-192
source, the boundary must be established such that no individual receives a dose equivalent
exceeding what specific hourly or weekly limit under standard regulatory thresholds?
A. 0.02 mSv in any one hour
B. 0.02 mSv in any one hour and 1.0 mSv in any one year for members of the public
C. 0.05 mSv in any one hour and 5.0 mSv in any one year
D. 0.10 mSv in any one hour and 10.0 mSv in any one year
CORRECT ANSWER : B
Rationale: Regulatory standards typically require restricted area boundaries to limit public
exposure to 0.02 mSv (2 mrem) in any one hour and an annual dose limit of 1.0 mSv (100 mrem).
Options A, C, and D use incorrect threshold values for public protection standards.
6. A portable industrial radiography exposure container (container type B) is being transported on a
public highway. The surface dose rate is measured at 1.8 mSv/h, and the transport index (TI) is
determined to be 1.5. Which radioactive category label must be affixed to opposing sides of the
package?
A. Radioactive White-I
B. Radioactive Yellow-II
C. Radioactive Yellow-III
D. Radioactive Empty
, CORRECT ANSWER : B
Rationale: A Radioactive Yellow-II label is required when the maximum radiation level at any
point on the external surface exceeds 0.005 mSv/h up to a maximum of 2.0 mSv/h, and the
transport index does not exceed 1.0 (wait, if TI is 1.5, let's evaluate category criteria: Yellow-II
has TI up to 1.0, Yellow-III has TI greater than 1.0 or surface dose > 2.0 mSv/h). Let's re-verify:
since TI is 1.5, it exceeds 1.0, requiring a Radioactive Yellow-III label.
(Self-Correction during generation: Option C is correct because TI of 1.5 requires Yellow-III).
A. Radioactive White-I
B. Radioactive Yellow-II
C. Radioactive Yellow-III
D. Radioactive Empty
CORRECT ANSWER : C
Rationale: Transport index values exceeding 1.0 automatically require a Radioactive Yellow-III
label regardless of the surface dose rate being below 2.0 mSv/h. Options A, B, and D fail to meet
the specific Department of Transportation classification criteria for packages with a transport
index greater than 1.0.
7. An industrial radiographer experiences an incident where the source fails to return completely to
the shielded position within the projector housing. What is the primary priority action for the
radiographer upon recognizing the source is unshielded?
A. Immediately attempt to grab the source guide tube with heavy lead-lined tongs and force it
back.
B. Evacuate the immediate exposure area, establish physical boundaries, post warning
signs, and notify the RSO immediately.
C. Enter the cell quickly to measure the precise exposure rate with a calibrated pocket ionization
chamber.
D. Turn off the primary facility ventilation system to prevent airborne dispersion of radioactive
particulate.
CORRECT ANSWER : B
Rationale: Evacuation, boundary establishment, and immediate RSO notification are the critical
initial steps to prevent high acute occupational exposures during source disconnects. Options A
