IRRSP
IRRSP Exam Questions with Verified
Answers 2025 GARDED A+
The symbol R means:
a. Rem
b. Rad
c. Roentgen
d. Radiation -Correct Answer ✔Roentgen
The acronym rad means:
a. Radiation Absorbed Dose
b. Roentgen Absorbed Dose
c. Roentgen Acquired Dose
d. Radiation At Death -Correct Answer ✔Radiation Absorbed Dose
The roentgen (R) exposure is measured in:
a. Tissue
b. Water
c. A lab
d. Air -Correct Answer ✔Air
The symbol mR means:
a. Milliroentgen
b. Microroentgen
c. Megaroentgen
d. Millirem -Correct Answer ✔Milliroentgen
One roentgen or 1 R is equal to:
a. 100 mR
b. 1000 mR
c. 0.001 mR
d. 1 mR -Correct Answer ✔1000 mR
The acronym rem stands for:
a. Radiation Equivalent Man
b. Radiation Effect Man
c. Roentgen Effect Man
d. Roentgen Equivalent Man -Correct Answer ✔Roentgen Equivalent Man
The initialism QF stands for:
a. Quantity factor
b. Quality frequency
c. Quality factor
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d. Quality effective factor -Correct Answer ✔Quality factor
The quality factor for X-rays and gamma rays is:
a. 1
b. 2
c. 10
d. 20 -Correct Answer ✔1
The quality factor for alpha(ray) particles is:
a. 1
b. 2
c. 10
d. 20 -Correct Answer ✔20
Activity of radioactive material is measured in:
a. Curies
b. Roentgens
c. Sieverts
d. Grays -Correct Answer ✔Curies
Becquerels and Curies are units of measurement of:
a. Physical size of the source
b. Gray per hour
c. Decay rate
d. Roentgen per hour -Correct Answer ✔Decay rate
Atoms that have excess energy and are unstable are known as:
a. Radioactive
b. Radioactivity
c. Balanced
d. Weighted -Correct Answer ✔Radioactive
Elementary particle units with a negative electrical charge and a mass approximately
equal to 1/1840 that of a proton are:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells -Correct Answer ✔Electrons
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 -Correct Answer ✔Protons
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Unchanged elementary particles with a mass nearly equal to that of a proton are called:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells -Correct Answer ✔Neutrons
The area known as the center of an atom is called the:
a. Electron
b. Nucleus
c. Proton
d. Neutron -Correct Answer ✔Nucleus
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 -Correct Answer ✔Sealed source
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 -Correct Answer ✔S tube
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 -Correct Answer ✔B
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 -Correct Answer ✔D
Becquerels and curies are units of measurement of:
a. Physical size of the source
b. Activity
c. Gray per hour
d. Roentgen per hour -Correct Answer ✔Activity
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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 -Correct Answer ✔A
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 -Correct Answer ✔Ionization
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 -Correct Answer ✔Detection equipment
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 -Correct Answer ✔B
Pocket ion chambers must be capable of reading:
a. 100 mR
b. 500 mR
c. 200 mR
d. 999 mR -Correct Answer ✔200 mR
An exposure rate is measured by:
a. Survey meter
b. Dosimeter
c. Rate alarm
d. Film badge/TLD -Correct Answer ✔Survey meter
What dosimeters (dosimeter devices) are least affected by moisture?
a. Digital dosimeters
b. Film badges
c. TLDs
d. Ion chambers -Correct Answer ✔TLDs
IRRSP
IRRSP Exam Questions with Verified
Answers 2025 GARDED A+
The symbol R means:
a. Rem
b. Rad
c. Roentgen
d. Radiation -Correct Answer ✔Roentgen
The acronym rad means:
a. Radiation Absorbed Dose
b. Roentgen Absorbed Dose
c. Roentgen Acquired Dose
d. Radiation At Death -Correct Answer ✔Radiation Absorbed Dose
The roentgen (R) exposure is measured in:
a. Tissue
b. Water
c. A lab
d. Air -Correct Answer ✔Air
The symbol mR means:
a. Milliroentgen
b. Microroentgen
c. Megaroentgen
d. Millirem -Correct Answer ✔Milliroentgen
One roentgen or 1 R is equal to:
a. 100 mR
b. 1000 mR
c. 0.001 mR
d. 1 mR -Correct Answer ✔1000 mR
The acronym rem stands for:
a. Radiation Equivalent Man
b. Radiation Effect Man
c. Roentgen Effect Man
d. Roentgen Equivalent Man -Correct Answer ✔Roentgen Equivalent Man
The initialism QF stands for:
a. Quantity factor
b. Quality frequency
c. Quality factor
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,IRRSP
d. Quality effective factor -Correct Answer ✔Quality factor
The quality factor for X-rays and gamma rays is:
a. 1
b. 2
c. 10
d. 20 -Correct Answer ✔1
The quality factor for alpha(ray) particles is:
a. 1
b. 2
c. 10
d. 20 -Correct Answer ✔20
Activity of radioactive material is measured in:
a. Curies
b. Roentgens
c. Sieverts
d. Grays -Correct Answer ✔Curies
Becquerels and Curies are units of measurement of:
a. Physical size of the source
b. Gray per hour
c. Decay rate
d. Roentgen per hour -Correct Answer ✔Decay rate
Atoms that have excess energy and are unstable are known as:
a. Radioactive
b. Radioactivity
c. Balanced
d. Weighted -Correct Answer ✔Radioactive
Elementary particle units with a negative electrical charge and a mass approximately
equal to 1/1840 that of a proton are:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells -Correct Answer ✔Electrons
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 -Correct Answer ✔Protons
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Unchanged elementary particles with a mass nearly equal to that of a proton are called:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells -Correct Answer ✔Neutrons
The area known as the center of an atom is called the:
a. Electron
b. Nucleus
c. Proton
d. Neutron -Correct Answer ✔Nucleus
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 -Correct Answer ✔Sealed source
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 -Correct Answer ✔S tube
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 -Correct Answer ✔B
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 -Correct Answer ✔D
Becquerels and curies are units of measurement of:
a. Physical size of the source
b. Activity
c. Gray per hour
d. Roentgen per hour -Correct Answer ✔Activity
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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 -Correct Answer ✔A
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 -Correct Answer ✔Ionization
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 -Correct Answer ✔Detection equipment
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 -Correct Answer ✔B
Pocket ion chambers must be capable of reading:
a. 100 mR
b. 500 mR
c. 200 mR
d. 999 mR -Correct Answer ✔200 mR
An exposure rate is measured by:
a. Survey meter
b. Dosimeter
c. Rate alarm
d. Film badge/TLD -Correct Answer ✔Survey meter
What dosimeters (dosimeter devices) are least affected by moisture?
a. Digital dosimeters
b. Film badges
c. TLDs
d. Ion chambers -Correct Answer ✔TLDs
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