IRRSP Practice Questions with
Guaranteed Pass Solutions 2026
Updated.
Roentgen - Answer The symbol R means:
a. Rem
b. Rad
c. Roentgen
d. Radiation
Radiation Absorbed Dose - Answer The acronym rad means:
a. Radiation Absorbed Dose
b. Roentgen Absorbed Dose
c. Roentgen Acquired Dose
d. Radiation At Death
Air - Answer The roentgen (R) exposure is measured in:
a. Tissue
b. Water
c. A lab
d. Air
Milliroentgen - Answer The symbol mR means:
a. Milliroentgen
b. Microroentgen
c. Megaroentgen
d. Millirem
1000 mR - Answer One roentgen or 1 R is equal to:
a. 100 mR
b. 1000 mR
c. 0.001 mR
d. 1 mR
,Roentgen Equivalent Man - Answer The acronym rem stands for:
a. Radiation Equivalent Man
b. Radiation Effect Man
c. Roentgen Effect Man
d. Roentgen Equivalent Man
Quality factor - Answer The initialism QF stands for:
a. Quantity factor
b. Quality frequency
c. Quality factor
d. Quality effective factor
1 - Answer The quality factor for X-rays and gamma rays is:
a. 1
b. 2
c. 10
d. 20
20 - Answer The quality factor for alpha(ray) particles is:
a. 1
b. 2
c. 10
d. 20
Curies - Answer Activity of radioactive material is measured in:
a. Curies
b. Roentgens
c. Sieverts
d. Grays
Decay rate - Answer 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
,Radioactive - Answer Atoms that have excess energy and are unstable are known as:
a. Radioactive
b. Radioactivity
c. Balanced
d. Weighted
Electrons - Answer 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
Protons - Answer 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
Neutrons - Answer Unchanged elementary particles with a mass nearly equal to that of a
proton are called:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells
Nucleus - Answer The area known as the center of an atom is called the:
a. Electron
b. Nucleus
c. Proton
d. Neutron
Sealed source - Answer 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
S tube - Answer 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
B - Answer 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
D - Answer 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
Activity - Answer Becquerels and curies are units of measurement of:
a. Physical size of the source
b. Activity
c. Gray per hour
d. Roentgen per hour
A - Answer 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
Guaranteed Pass Solutions 2026
Updated.
Roentgen - Answer The symbol R means:
a. Rem
b. Rad
c. Roentgen
d. Radiation
Radiation Absorbed Dose - Answer The acronym rad means:
a. Radiation Absorbed Dose
b. Roentgen Absorbed Dose
c. Roentgen Acquired Dose
d. Radiation At Death
Air - Answer The roentgen (R) exposure is measured in:
a. Tissue
b. Water
c. A lab
d. Air
Milliroentgen - Answer The symbol mR means:
a. Milliroentgen
b. Microroentgen
c. Megaroentgen
d. Millirem
1000 mR - Answer One roentgen or 1 R is equal to:
a. 100 mR
b. 1000 mR
c. 0.001 mR
d. 1 mR
,Roentgen Equivalent Man - Answer The acronym rem stands for:
a. Radiation Equivalent Man
b. Radiation Effect Man
c. Roentgen Effect Man
d. Roentgen Equivalent Man
Quality factor - Answer The initialism QF stands for:
a. Quantity factor
b. Quality frequency
c. Quality factor
d. Quality effective factor
1 - Answer The quality factor for X-rays and gamma rays is:
a. 1
b. 2
c. 10
d. 20
20 - Answer The quality factor for alpha(ray) particles is:
a. 1
b. 2
c. 10
d. 20
Curies - Answer Activity of radioactive material is measured in:
a. Curies
b. Roentgens
c. Sieverts
d. Grays
Decay rate - Answer 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
,Radioactive - Answer Atoms that have excess energy and are unstable are known as:
a. Radioactive
b. Radioactivity
c. Balanced
d. Weighted
Electrons - Answer 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
Protons - Answer 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
Neutrons - Answer Unchanged elementary particles with a mass nearly equal to that of a
proton are called:
a. Electrons
b. Protons
c. Neutrons
d. Valence shells
Nucleus - Answer The area known as the center of an atom is called the:
a. Electron
b. Nucleus
c. Proton
d. Neutron
Sealed source - Answer 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
S tube - Answer 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
B - Answer 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
D - Answer 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
Activity - Answer Becquerels and curies are units of measurement of:
a. Physical size of the source
b. Activity
c. Gray per hour
d. Roentgen per hour
A - Answer 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
