IRRSP LATEST 2026 STUDY GUIDE QUESTIONS AND
ANSWERS GRADED A+
✔✔The total mass of an atom. It is approximately equal to the total number of protons
and neutrons in the nucleus of an atom and measured in atomic mass (AMU). -
✔✔Atomic weight
✔✔The SI unit of radiation activity that is equal to one disintegration per second.
3.7*10^10 Bq = 1 Ci. - ✔✔Becquerel (Bq)
✔✔The electromagnetic radiation produced by an electrically charged particle, such as
an electron, subjected to a change in velocity. It is the German word meaning braking
radiation. - ✔✔Bremsstrahlung
✔✔A process by which electromagnetic radiation is absorbed completely when it
interacts with matter. - ✔✔Photoelectric effect
✔✔A process in which a photon transfers a portion of it energy to an atom dislodging
and accelerating an orbital electron and a lower energy photon is scattered at an angle
to the original photon path. - ✔✔Compton scatter
✔✔A process by which electromagnetic radiation of 1.02 mRv or greater transforms its
energy into an electron-positron pair during its interaction with an atom. - ✔✔Paired
production
✔✔A chemical combination of elements. - ✔✔Compound
✔✔An area, outside of a restricted area but inside the site boundary, access to which
can be limited by the licensee for any reason. - ✔✔Controlled area
✔✔The basic unit used to describe the intensity of radioactive (disintegration rate) of a
radioisotope. One curie represents a disintegration rate of
3.7*10^10 events per second. - ✔✔Curie (Ci)
✔✔The transformation of radioactive atoms into a stable state resulting in energy
(radiation) and particle emission. - ✔✔Disintegration
✔✔The acronym rad means: - ✔✔radiation absorbed dose
✔✔1 R is equal to: - ✔✔1000 milliroentgen (1000mR)
✔✔The acronym rem stands for: - ✔✔Roentgen Equivalent Man
, ✔✔Any by-product material that is incased in a capsule designed to prevent leakage or
escape of the by-product material is a: - ✔✔Sealed source
✔✔A survey meter must be capable of measuring a range of: - ✔✔2 to 1000 mR/h (0.02
to 10 mSv/h)
✔✔In the early years of radiography what caused personnel to be over exposed? -
✔✔Pour equipment design, lack of understanding, a lack of and poor safety practices.
✔✔In what year did Marie Curie discover radium? - ✔✔Late 1898
✔✔Who coined to the term radioactivity? - ✔✔Marie and Pierre Curie
✔✔In the early years of radiography from 1920-1930 the maximum thickness that could
be inspected via X-radiation was_______of steel? - ✔✔3in. (7.62cm)
✔✔Historically it has been proven that the predominant cause of over exposure is: -
✔✔Improper service, the source being left in an uncontrolled state, the source not being
locked once reacted to the shield position.
✔✔The responsibility to add here to regulations, license conditions and company
policies falls to: - ✔✔The radiography for, the assistant radiography for, the radiation
safety officer.
✔✔Alpha particles were discovered by who? - ✔✔Earnest Rutherford
✔✔The 1st medical X-ray was conducted at: - ✔✔Massachusetts General
✔✔Are regulations from one state to the next essentially the same for radioactive
materials? - ✔✔Yes (true)
✔✔A radiographer for has several avenues to seek guidance and counsel. The 1st
person he or she can't turn to is? - ✔✔A senior technician
✔✔Origins of industrial radiography can be attributed to who? - ✔✔Wilhelm Rontgen
✔✔Over exposures to personnel can result in: - ✔✔Cancer, genetic defects carried into
further generations and death.
✔✔Can radiation exposures be equally serious and can result in death? - ✔✔Yes (True)
✔✔Ionizing radiation passes through the entire Body; as such, damage can occur to
the: - ✔✔Skin, internal organs, and muscles.
ANSWERS GRADED A+
✔✔The total mass of an atom. It is approximately equal to the total number of protons
and neutrons in the nucleus of an atom and measured in atomic mass (AMU). -
✔✔Atomic weight
✔✔The SI unit of radiation activity that is equal to one disintegration per second.
3.7*10^10 Bq = 1 Ci. - ✔✔Becquerel (Bq)
✔✔The electromagnetic radiation produced by an electrically charged particle, such as
an electron, subjected to a change in velocity. It is the German word meaning braking
radiation. - ✔✔Bremsstrahlung
✔✔A process by which electromagnetic radiation is absorbed completely when it
interacts with matter. - ✔✔Photoelectric effect
✔✔A process in which a photon transfers a portion of it energy to an atom dislodging
and accelerating an orbital electron and a lower energy photon is scattered at an angle
to the original photon path. - ✔✔Compton scatter
✔✔A process by which electromagnetic radiation of 1.02 mRv or greater transforms its
energy into an electron-positron pair during its interaction with an atom. - ✔✔Paired
production
✔✔A chemical combination of elements. - ✔✔Compound
✔✔An area, outside of a restricted area but inside the site boundary, access to which
can be limited by the licensee for any reason. - ✔✔Controlled area
✔✔The basic unit used to describe the intensity of radioactive (disintegration rate) of a
radioisotope. One curie represents a disintegration rate of
3.7*10^10 events per second. - ✔✔Curie (Ci)
✔✔The transformation of radioactive atoms into a stable state resulting in energy
(radiation) and particle emission. - ✔✔Disintegration
✔✔The acronym rad means: - ✔✔radiation absorbed dose
✔✔1 R is equal to: - ✔✔1000 milliroentgen (1000mR)
✔✔The acronym rem stands for: - ✔✔Roentgen Equivalent Man
, ✔✔Any by-product material that is incased in a capsule designed to prevent leakage or
escape of the by-product material is a: - ✔✔Sealed source
✔✔A survey meter must be capable of measuring a range of: - ✔✔2 to 1000 mR/h (0.02
to 10 mSv/h)
✔✔In the early years of radiography what caused personnel to be over exposed? -
✔✔Pour equipment design, lack of understanding, a lack of and poor safety practices.
✔✔In what year did Marie Curie discover radium? - ✔✔Late 1898
✔✔Who coined to the term radioactivity? - ✔✔Marie and Pierre Curie
✔✔In the early years of radiography from 1920-1930 the maximum thickness that could
be inspected via X-radiation was_______of steel? - ✔✔3in. (7.62cm)
✔✔Historically it has been proven that the predominant cause of over exposure is: -
✔✔Improper service, the source being left in an uncontrolled state, the source not being
locked once reacted to the shield position.
✔✔The responsibility to add here to regulations, license conditions and company
policies falls to: - ✔✔The radiography for, the assistant radiography for, the radiation
safety officer.
✔✔Alpha particles were discovered by who? - ✔✔Earnest Rutherford
✔✔The 1st medical X-ray was conducted at: - ✔✔Massachusetts General
✔✔Are regulations from one state to the next essentially the same for radioactive
materials? - ✔✔Yes (true)
✔✔A radiographer for has several avenues to seek guidance and counsel. The 1st
person he or she can't turn to is? - ✔✔A senior technician
✔✔Origins of industrial radiography can be attributed to who? - ✔✔Wilhelm Rontgen
✔✔Over exposures to personnel can result in: - ✔✔Cancer, genetic defects carried into
further generations and death.
✔✔Can radiation exposures be equally serious and can result in death? - ✔✔Yes (True)
✔✔Ionizing radiation passes through the entire Body; as such, damage can occur to
the: - ✔✔Skin, internal organs, and muscles.
