CERTIFIED X-RAY SUPERVISOR AND OPERATOR PRACTICE
EXAMINATION ACTUAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS LATEST VERSION 2026-
2027 (100% VERIFIED ANSWERS) ALREADY GRADED A+
Question 1
According to the California Code of Regulations, Title 17, who is legally responsible for
ensuring that all x-ray equipment is operated in compliance with applicable regulations?
A) The x-ray equipment manufacturer
B) The certified X-ray Supervisor and Operator
C) The Radiologic Health Branch inspector
D) The facility’s radiation safety officer only
Answer: B
Rationale: Title 17 places direct responsibility for the safe and compliant operation of x-ray
equipment on the certified Supervisor and Operator present during use. While the radiation
safety officer (RSO) has administrative oversight, the operator must ensure that each
procedure follows regulatory requirements. The manufacturer is not responsible for daily
operational compliance, and an inspector enforces regulations but does not assume the
operator’s duties.
Question 2
A cabinet x-ray system used for security screening must have a safety interlock that:
A) Is activated by a key switch only
B) Prevents x-ray production when any access door is opened
C) Is bypassed during maintenance by any operator
D) Requires monthly testing by an outside contractor
Answer: B
Rationale: California regulations require that cabinet x-ray systems be equipped with
,interlocks that automatically terminate or prevent x-ray generation whenever a door, panel,
or access point is opened, thereby protecting personnel from exposure. Key switches may be
used but are not a substitute for door interlocks. Interlocks must not be casually bypassed;
any bypass requires specific administrative controls and posting.
Question 3
A radiographer is using a 100 Ci iridium-192 source for industrial radiography. The source
becomes stuck in the guide tube during retraction. Which action must be taken FIRST
according to the facility’s emergency procedures?
A) Attempt to force the source back into the camera with a tool
B) Immediately cordon off the area, post “High Radiation Area” signs, and notify the Radiation
Safety Officer
C) Leave the area and resume normal operations
D) Increase the survey meter range and continue working
Answer: B
Rationale: The first priority in a source malfunction is to secure the area and prevent exposure
to personnel. Forcible manipulation could damage the source or increase exposure. The
emergency plan requires immediate area control, notification of the RSO, and implementation
of the facility’s written emergency procedures. Leaving the area without securing it would be
a serious violation.
Question 4
What is the annual occupational dose limit for the lens of the eye as specified in California
regulations for radiation workers?
A) 5 rem (0.05 Sv)
B) 1.5 rem (0.015 Sv)
C) 15 rem (0.15 Sv)
D) 2 rem (0.02 Sv)
Answer: C
Rationale: Title 17 sets the annual occupational dose limit for the lens of the eye at 15 rem
(0.15 Sv). The NCRP later recommended a lower limit of 2 rem, but California has not adopted
that change into regulation; the enforceable state limit remains 15 rem. The 5 rem limit
applies to the whole body, and 50 rem (500 mSv) applies to skin and extremities.
,Question 5
Which type of survey meter is most appropriate for detecting and measuring low-energy x-ray
leakage from a cabinet x-ray system?
A) Geiger-Müller (GM) survey meter with a thin window probe
B) Scintillation survey meter with a sodium iodide crystal
C) Ionization chamber survey meter
D) Neutron rem meter
Answer: A
Rationale: A thin-window GM meter is capable of detecting low-energy photons (e.g., 10–50
keV) that may leak from a cabinet x-ray system. Ionization chambers are more accurate for
higher exposure rates but may be less sensitive to low-energy leakage. A scintillation meter is
highly sensitive but is typically used for contamination surveys. Neutron meters are not
relevant to photon x-ray systems.
Question 6
A security x-ray baggage screening system must have a visual indicator that the x-ray tube is
energized. Which color is required by California regulations for this “x-ray on” indicator?
A) Green
B) Yellow
C) Red
D) Blue
Answer: C
Rationale: California regulations require that the x-ray tube-on status be clearly indicated by
a red light that is visible to the operator and, where appropriate, to others near the
equipment. Yellow is used for caution, and green typically indicates safe or ready status. The
red indicator is a standard safety warning.
Question 7
A certified X-ray Supervisor and Operator is required to wear a personnel dosimeter when
operating open-beam x-ray equipment. Where should the dosimeter be worn on the body?
A) On the collar, outside any protective apron
B) On the waist, under a lead apron
C) On the wrist
D) On the ankle
, Answer: A
Rationale: To best estimate dose to the whole body and the lens of the eye, the primary
dosimeter is worn at collar level, outside any protective apron, on the front of the torso. If a
lead apron is worn, a second dosimeter may be worn under the apron at the waist for fetal
monitoring or whole-body dose assessment, but the single dosimeter worn at the collar is the
standard for extremity and lens dose estimation.
Question 8
What is the California regulatory dose limit for a member of the general public from
operations of a licensed x-ray facility?
A) 0.1 rem (1 mSv) per year
B) 0.5 rem (5 mSv) per year
C) 2 rem (20 mSv) per year
D) 5 rem (50 mSv) per year
Answer: A
Rationale: Title 17 limits exposure to individual members of the public to 0.1 rem (1 mSv) per
year from the facility’s operations, excluding background and medical exposures. The
occupational limit for whole body is 5 rem/year; public limits are much lower to ensure safety
for non-occupationally exposed individuals.
Question 9
When performing a radiation survey of a storage container for a gamma radiography source
after securing the source, the survey must include measurements:
A) Only at the container surface
B) At the container surface and at one meter from the container
C) At the control panel
D) Only with the source fully extended
Answer: B
Rationale: After a source is retracted and locked, the radiographer must survey both the
surface of the camera/container and at one meter to verify that the source is fully shielded
and that dose rates are within regulatory limits. This ensures no leakage and confirms proper
shielding integrity. A surface survey alone may not detect a partially shielded source.
EXAMINATION ACTUAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS LATEST VERSION 2026-
2027 (100% VERIFIED ANSWERS) ALREADY GRADED A+
Question 1
According to the California Code of Regulations, Title 17, who is legally responsible for
ensuring that all x-ray equipment is operated in compliance with applicable regulations?
A) The x-ray equipment manufacturer
B) The certified X-ray Supervisor and Operator
C) The Radiologic Health Branch inspector
D) The facility’s radiation safety officer only
Answer: B
Rationale: Title 17 places direct responsibility for the safe and compliant operation of x-ray
equipment on the certified Supervisor and Operator present during use. While the radiation
safety officer (RSO) has administrative oversight, the operator must ensure that each
procedure follows regulatory requirements. The manufacturer is not responsible for daily
operational compliance, and an inspector enforces regulations but does not assume the
operator’s duties.
Question 2
A cabinet x-ray system used for security screening must have a safety interlock that:
A) Is activated by a key switch only
B) Prevents x-ray production when any access door is opened
C) Is bypassed during maintenance by any operator
D) Requires monthly testing by an outside contractor
Answer: B
Rationale: California regulations require that cabinet x-ray systems be equipped with
,interlocks that automatically terminate or prevent x-ray generation whenever a door, panel,
or access point is opened, thereby protecting personnel from exposure. Key switches may be
used but are not a substitute for door interlocks. Interlocks must not be casually bypassed;
any bypass requires specific administrative controls and posting.
Question 3
A radiographer is using a 100 Ci iridium-192 source for industrial radiography. The source
becomes stuck in the guide tube during retraction. Which action must be taken FIRST
according to the facility’s emergency procedures?
A) Attempt to force the source back into the camera with a tool
B) Immediately cordon off the area, post “High Radiation Area” signs, and notify the Radiation
Safety Officer
C) Leave the area and resume normal operations
D) Increase the survey meter range and continue working
Answer: B
Rationale: The first priority in a source malfunction is to secure the area and prevent exposure
to personnel. Forcible manipulation could damage the source or increase exposure. The
emergency plan requires immediate area control, notification of the RSO, and implementation
of the facility’s written emergency procedures. Leaving the area without securing it would be
a serious violation.
Question 4
What is the annual occupational dose limit for the lens of the eye as specified in California
regulations for radiation workers?
A) 5 rem (0.05 Sv)
B) 1.5 rem (0.015 Sv)
C) 15 rem (0.15 Sv)
D) 2 rem (0.02 Sv)
Answer: C
Rationale: Title 17 sets the annual occupational dose limit for the lens of the eye at 15 rem
(0.15 Sv). The NCRP later recommended a lower limit of 2 rem, but California has not adopted
that change into regulation; the enforceable state limit remains 15 rem. The 5 rem limit
applies to the whole body, and 50 rem (500 mSv) applies to skin and extremities.
,Question 5
Which type of survey meter is most appropriate for detecting and measuring low-energy x-ray
leakage from a cabinet x-ray system?
A) Geiger-Müller (GM) survey meter with a thin window probe
B) Scintillation survey meter with a sodium iodide crystal
C) Ionization chamber survey meter
D) Neutron rem meter
Answer: A
Rationale: A thin-window GM meter is capable of detecting low-energy photons (e.g., 10–50
keV) that may leak from a cabinet x-ray system. Ionization chambers are more accurate for
higher exposure rates but may be less sensitive to low-energy leakage. A scintillation meter is
highly sensitive but is typically used for contamination surveys. Neutron meters are not
relevant to photon x-ray systems.
Question 6
A security x-ray baggage screening system must have a visual indicator that the x-ray tube is
energized. Which color is required by California regulations for this “x-ray on” indicator?
A) Green
B) Yellow
C) Red
D) Blue
Answer: C
Rationale: California regulations require that the x-ray tube-on status be clearly indicated by
a red light that is visible to the operator and, where appropriate, to others near the
equipment. Yellow is used for caution, and green typically indicates safe or ready status. The
red indicator is a standard safety warning.
Question 7
A certified X-ray Supervisor and Operator is required to wear a personnel dosimeter when
operating open-beam x-ray equipment. Where should the dosimeter be worn on the body?
A) On the collar, outside any protective apron
B) On the waist, under a lead apron
C) On the wrist
D) On the ankle
, Answer: A
Rationale: To best estimate dose to the whole body and the lens of the eye, the primary
dosimeter is worn at collar level, outside any protective apron, on the front of the torso. If a
lead apron is worn, a second dosimeter may be worn under the apron at the waist for fetal
monitoring or whole-body dose assessment, but the single dosimeter worn at the collar is the
standard for extremity and lens dose estimation.
Question 8
What is the California regulatory dose limit for a member of the general public from
operations of a licensed x-ray facility?
A) 0.1 rem (1 mSv) per year
B) 0.5 rem (5 mSv) per year
C) 2 rem (20 mSv) per year
D) 5 rem (50 mSv) per year
Answer: A
Rationale: Title 17 limits exposure to individual members of the public to 0.1 rem (1 mSv) per
year from the facility’s operations, excluding background and medical exposures. The
occupational limit for whole body is 5 rem/year; public limits are much lower to ensure safety
for non-occupationally exposed individuals.
Question 9
When performing a radiation survey of a storage container for a gamma radiography source
after securing the source, the survey must include measurements:
A) Only at the container surface
B) At the container surface and at one meter from the container
C) At the control panel
D) Only with the source fully extended
Answer: B
Rationale: After a source is retracted and locked, the radiographer must survey both the
surface of the camera/container and at one meter to verify that the source is fully shielded
and that dose rates are within regulatory limits. This ensures no leakage and confirms proper
shielding integrity. A surface survey alone may not detect a partially shielded source.
