IRRSP Certification test 2025 with 300 questions
and correct verified answers/ Industrial
Radiography Radiation Safety Personnel IRRSP
EXAM latest 2025 (brand new!)
The first indication of an extremity radiation overexposure is:
a. Reddening of the skin
b. Hair loss
c. Nausea
d. Blisters - ANSWER-Reddening of the skin
Gamma radiation has a shorter wavelength than visible light, therefore making it:
a. Less penetrating
b. More penetrating
c. Brighter
d. Less stable - ANSWER-More penetrating
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 - ANSWER-D
pg. 1
,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 - ANSWER-75 mR/hr
After 6 half-value layers, what percentage of radiation would be received?
a. 50%
b. 25%
c. 8%
d. 1.6% - ANSWER-1.6%
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 - ANSWER-60 years
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
pg. 2
,d. 10 mR - ANSWER-15 mR
The use of 4 half-value layers will reduce the exposure by a factor of:
a. 4 times
b. 8 times
c. 16 times
d. 32 times - ANSWER-16 times
If a radiographer has 98 Ci of Ir-192, after 148 days how many curies would be
left? (Iridium half-life value is 74 days)
a. 49 Ci
b. 22 Ci
c. 12 Ci
d. 24.5 Ci - ANSWER-24.5 Ci
A sealed source emits what?
a. Alpha particles
b. Beta particles
c. X rays
d. Gamma rays - ANSWER-Gamma rays
A cobalt source has decayed from its original activity after 3 half-lives. Originally
it was 88 Ci. Its current activity is:
a. 44 Ci
b. 22 Ci
c. 11 Ci
pg. 3
, d. 8 Ci - ANSWER-11 Ci
A cobalt source of 73 Ci is exposed for a full 60 min. Assume a 14.0 R/hr/Ci @ 1ft
factor, shooting through a 3 half-value collimator. What would the restricted area
(2 mr/hr) be on the cold or collimated side of the collimator? (Use Inverse Square
Law (Intensity 1/Intensity 2) = (Distance 2 Squared/ Distance 1 Squared))
a. 149 ft
b. 162 ft
c. 211 ft
d. 253 ft - ANSWER-253 ft
The ball on a source assembly that prevents the source from exiting through the
back of the camera is called:
a. Stop ball
b. Pigtail ball
c. Safety stop ball
d. Retraction inhibitor ball - ANSWER-Stop ball
Emission of gamma rays, alpha rays and beta rays is considered what?
a. Characteristics of source decay
b. Material is stable
c. Material is unbalanced
d. Leaking source - ANSWER-Characteristics of source decay
To penetrate a thicker or denser material, you would need a source with:
a. More curies
b. More activity
pg. 4
and correct verified answers/ Industrial
Radiography Radiation Safety Personnel IRRSP
EXAM latest 2025 (brand new!)
The first indication of an extremity radiation overexposure is:
a. Reddening of the skin
b. Hair loss
c. Nausea
d. Blisters - ANSWER-Reddening of the skin
Gamma radiation has a shorter wavelength than visible light, therefore making it:
a. Less penetrating
b. More penetrating
c. Brighter
d. Less stable - ANSWER-More penetrating
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 - ANSWER-D
pg. 1
,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 - ANSWER-75 mR/hr
After 6 half-value layers, what percentage of radiation would be received?
a. 50%
b. 25%
c. 8%
d. 1.6% - ANSWER-1.6%
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 - ANSWER-60 years
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
pg. 2
,d. 10 mR - ANSWER-15 mR
The use of 4 half-value layers will reduce the exposure by a factor of:
a. 4 times
b. 8 times
c. 16 times
d. 32 times - ANSWER-16 times
If a radiographer has 98 Ci of Ir-192, after 148 days how many curies would be
left? (Iridium half-life value is 74 days)
a. 49 Ci
b. 22 Ci
c. 12 Ci
d. 24.5 Ci - ANSWER-24.5 Ci
A sealed source emits what?
a. Alpha particles
b. Beta particles
c. X rays
d. Gamma rays - ANSWER-Gamma rays
A cobalt source has decayed from its original activity after 3 half-lives. Originally
it was 88 Ci. Its current activity is:
a. 44 Ci
b. 22 Ci
c. 11 Ci
pg. 3
, d. 8 Ci - ANSWER-11 Ci
A cobalt source of 73 Ci is exposed for a full 60 min. Assume a 14.0 R/hr/Ci @ 1ft
factor, shooting through a 3 half-value collimator. What would the restricted area
(2 mr/hr) be on the cold or collimated side of the collimator? (Use Inverse Square
Law (Intensity 1/Intensity 2) = (Distance 2 Squared/ Distance 1 Squared))
a. 149 ft
b. 162 ft
c. 211 ft
d. 253 ft - ANSWER-253 ft
The ball on a source assembly that prevents the source from exiting through the
back of the camera is called:
a. Stop ball
b. Pigtail ball
c. Safety stop ball
d. Retraction inhibitor ball - ANSWER-Stop ball
Emission of gamma rays, alpha rays and beta rays is considered what?
a. Characteristics of source decay
b. Material is stable
c. Material is unbalanced
d. Leaking source - ANSWER-Characteristics of source decay
To penetrate a thicker or denser material, you would need a source with:
a. More curies
b. More activity
pg. 4
