IRRSP UPDATED EXAM SCRIPT QUESTIONS AND ANSWERS
GRADED A+
✔✔Half value layer - ✔✔The thickness of shielding material required to reduce a
radiation intensity to one-half it's original value is known as the:
a. Tenth value layer
b. Half life
c. Roentgen value layer
d. Half value layer
✔✔Protons - ✔✔An element is identified by the number of _______ in it's nucleus.
a. Photons
b. Neutrons
c. Electrons
d. Protons
✔✔Time, distance, shielding and ALARA considerations - ✔✔What basic methods
should a radiographer use to control exposure to radiation?
a. Half life, shielding and distance
b. Alarm rate meters, shielding and distance
c. Shielding, film badges and distance
d. Time, distance, shielding and ALARA considerations
✔✔64.5 feet and 456.1 feet - ✔✔Using an unshielded 80 Curie Iridium-192 source, at
what distances should the "High Radiation Area" and the "Restricted Area" boundaries
be placed?
a. 64.5 feet and 288.4 feet
b. 2.04 feet and 144.2 feet
c. 105.8 feet and 748.3 feet
d. 64.5 feet and 456.1 feet
✔✔B - ✔✔"Saturation" of a Geiger Muller survey instrument refers to:
(Answer with A, B, C, or D)
a. A meter that malfunctions as a result of being water logged
b. A survey meter that indicates a false zero reading when exposed to a high radiation
intensity
c. A meter that will not work on Saturdays
d. A meter that is damaged
✔✔189.1 feet - ✔✔An Iridium-192 source that was originally 110 Curies has decayed
for 222 days. At what distance from the source should a radiographer place the
"Restricted Area" boundary?
a. 189.1 feet
b. 411.1 feet
c. 119.6 feet
, d. 534.8 feet
✔✔Ionization - ✔✔Radiation detection instruments measure exposure to radiation
based on the principal of:
a. The inverse square law
b. Mitosis
c. Attenuation
d. Ionization
✔✔D - ✔✔Before the first radiographic exposure, a radiographer performs a reference
survey of his exposure device containing 100 Curies of Iridium-192. During this survey,
he observes a zero reading on his survey meter. The radiographer should:
(Answer with A, B, C, or D)
a. Proceed with radiographic operations as a zero reading indicates a safe radiation
level
b. Assume the exposure device is empty based on the survey
c. Expose the source and perform more surveys to confirm the survey meter responds
d. Assume the survey meter is not working properly. The exposure device must be
surveyed with another survey meter
✔✔C - ✔✔A radiographer discovers that his pocket dosimeter is "off scale" during a
lunch break. The radiographer should:
(Answer with A, B, C, or D)
a. Obtain a replacement pocket dosimeter before returning to work
b. Assume that he bumped the pocket dosimeter while working and continue
radiographic operations
c. Immediately stop all work with radiation, notify the RSO or designee and send the film
badge or TLD out for emergency processing within 24 hours
d. Re-zero the pocket dosimeter before returning to work
✔✔C - ✔✔By regulations, survey meters that are utilized in radiographic operations
must be capable of measuring a range of:
(Answer with A, B, C, or D)
a. 10 mR/hr-1000 mR/hr
b. 0 mR/hr-500 mR/hr
c. 2 mR/hr-1000 mR/hr
d. 5 mR/hr-1 R/hr
✔✔C - ✔✔Which of the following describes the information that must be included on a
utilization log?
(Answer with A, B, C, or D)
a. Name of radiographer, dosimeter readings, survey meter serial number, location
used
b. Make and model of the exposure device, dosimeter readings, location of use, number
of radiographic exposures
GRADED A+
✔✔Half value layer - ✔✔The thickness of shielding material required to reduce a
radiation intensity to one-half it's original value is known as the:
a. Tenth value layer
b. Half life
c. Roentgen value layer
d. Half value layer
✔✔Protons - ✔✔An element is identified by the number of _______ in it's nucleus.
a. Photons
b. Neutrons
c. Electrons
d. Protons
✔✔Time, distance, shielding and ALARA considerations - ✔✔What basic methods
should a radiographer use to control exposure to radiation?
a. Half life, shielding and distance
b. Alarm rate meters, shielding and distance
c. Shielding, film badges and distance
d. Time, distance, shielding and ALARA considerations
✔✔64.5 feet and 456.1 feet - ✔✔Using an unshielded 80 Curie Iridium-192 source, at
what distances should the "High Radiation Area" and the "Restricted Area" boundaries
be placed?
a. 64.5 feet and 288.4 feet
b. 2.04 feet and 144.2 feet
c. 105.8 feet and 748.3 feet
d. 64.5 feet and 456.1 feet
✔✔B - ✔✔"Saturation" of a Geiger Muller survey instrument refers to:
(Answer with A, B, C, or D)
a. A meter that malfunctions as a result of being water logged
b. A survey meter that indicates a false zero reading when exposed to a high radiation
intensity
c. A meter that will not work on Saturdays
d. A meter that is damaged
✔✔189.1 feet - ✔✔An Iridium-192 source that was originally 110 Curies has decayed
for 222 days. At what distance from the source should a radiographer place the
"Restricted Area" boundary?
a. 189.1 feet
b. 411.1 feet
c. 119.6 feet
, d. 534.8 feet
✔✔Ionization - ✔✔Radiation detection instruments measure exposure to radiation
based on the principal of:
a. The inverse square law
b. Mitosis
c. Attenuation
d. Ionization
✔✔D - ✔✔Before the first radiographic exposure, a radiographer performs a reference
survey of his exposure device containing 100 Curies of Iridium-192. During this survey,
he observes a zero reading on his survey meter. The radiographer should:
(Answer with A, B, C, or D)
a. Proceed with radiographic operations as a zero reading indicates a safe radiation
level
b. Assume the exposure device is empty based on the survey
c. Expose the source and perform more surveys to confirm the survey meter responds
d. Assume the survey meter is not working properly. The exposure device must be
surveyed with another survey meter
✔✔C - ✔✔A radiographer discovers that his pocket dosimeter is "off scale" during a
lunch break. The radiographer should:
(Answer with A, B, C, or D)
a. Obtain a replacement pocket dosimeter before returning to work
b. Assume that he bumped the pocket dosimeter while working and continue
radiographic operations
c. Immediately stop all work with radiation, notify the RSO or designee and send the film
badge or TLD out for emergency processing within 24 hours
d. Re-zero the pocket dosimeter before returning to work
✔✔C - ✔✔By regulations, survey meters that are utilized in radiographic operations
must be capable of measuring a range of:
(Answer with A, B, C, or D)
a. 10 mR/hr-1000 mR/hr
b. 0 mR/hr-500 mR/hr
c. 2 mR/hr-1000 mR/hr
d. 5 mR/hr-1 R/hr
✔✔C - ✔✔Which of the following describes the information that must be included on a
utilization log?
(Answer with A, B, C, or D)
a. Name of radiographer, dosimeter readings, survey meter serial number, location
used
b. Make and model of the exposure device, dosimeter readings, location of use, number
of radiographic exposures
