Radiation Protection and Radiobiology Test
UPDATED Exam Questions and
CORRECT Answers
Ionizing radiation - CORRECT ANSWER✔✔- produces diagnostic image
radiation risks - CORRECT ANSWER✔✔- Exposure to radiation - involves risk of biologic
changes
Use sound judgment - minimize quantity of radiation
Protect all persons from unnecessary exposure
Group includes self, patient and anyone else
Sources of Ionizing Radiation - CORRECT ANSWER✔✔- Natural (background) - cosmic
radiation from the sun & planetary bodies, uranium and radium inhaled or ingested through
food, water or air
Human-made - nuclear industry, radionuclides, and medical/dental exposures.
Nuclear industry - fallout from above-ground weapons testing, accidents in nuclear power
stations, and disposal of by-products from these plants
Radionuclide exposure includes products like smoke detectors that contain radioactive
elements and radiopharmaceuticals used in diagnosing and treating disease.
Medical/dental exposures - greatest source
Human-made radiation (x-rays) - CORRECT ANSWER✔✔- form of electromagnetic
radiation that travels at the speed of light.
Unlike particulate radiation (a liberated portion of the atom capable of traveling for short
distances and reacting with matter.)
, Bundles of energy moving as waves in space, depositing energy at random
Source of electrons, force to move them rapidly and something to stop the movement must all
be present - provided by the x-ray tube and its electrical supply.
particulate radiation - CORRECT ANSWER✔✔- (a liberated portion of the atom capable of
traveling for short distances and reacting with matter.)
all must be present - CORRECT ANSWER✔✔- Source of electrons, a force to move them
rapidly and something to stop the movement - provided by the x-ray tube and its electrical
supply.
Tube - CORRECT ANSWER✔✔- cathode (negative terminal) and anode (positive terminal)
in glass envelope to maintain the vacuum needed for optimal x-ray production
Cathode's filament - CORRECT ANSWER✔✔- thoriated tungsten which provides the
source of electrons.
Kilovoltage - CORRECT ANSWER✔✔- applied to the filament accelerates the stream of
electrons toward the anode end. X-rays are produced when the electrons strike the anode
(energy conversion) and produces x-rays and heat. Heterogeneous (has many energies) -
measure in kiloelectron volts (keV). This is the primary beam and it is directed toward the
patient through a window in the tube.
Three possibilities when x-rays strike matter: - CORRECT ANSWER✔✔- Can be absorbed
Can transfer some energy and then scatter
Can pass through unaffected
Interactions with matter - CORRECT ANSWER✔✔- Classic coherent scattering
Photoelectric interactions
Compton scattering (the Compton effect)
Pair production
Photodisintegration
UPDATED Exam Questions and
CORRECT Answers
Ionizing radiation - CORRECT ANSWER✔✔- produces diagnostic image
radiation risks - CORRECT ANSWER✔✔- Exposure to radiation - involves risk of biologic
changes
Use sound judgment - minimize quantity of radiation
Protect all persons from unnecessary exposure
Group includes self, patient and anyone else
Sources of Ionizing Radiation - CORRECT ANSWER✔✔- Natural (background) - cosmic
radiation from the sun & planetary bodies, uranium and radium inhaled or ingested through
food, water or air
Human-made - nuclear industry, radionuclides, and medical/dental exposures.
Nuclear industry - fallout from above-ground weapons testing, accidents in nuclear power
stations, and disposal of by-products from these plants
Radionuclide exposure includes products like smoke detectors that contain radioactive
elements and radiopharmaceuticals used in diagnosing and treating disease.
Medical/dental exposures - greatest source
Human-made radiation (x-rays) - CORRECT ANSWER✔✔- form of electromagnetic
radiation that travels at the speed of light.
Unlike particulate radiation (a liberated portion of the atom capable of traveling for short
distances and reacting with matter.)
, Bundles of energy moving as waves in space, depositing energy at random
Source of electrons, force to move them rapidly and something to stop the movement must all
be present - provided by the x-ray tube and its electrical supply.
particulate radiation - CORRECT ANSWER✔✔- (a liberated portion of the atom capable of
traveling for short distances and reacting with matter.)
all must be present - CORRECT ANSWER✔✔- Source of electrons, a force to move them
rapidly and something to stop the movement - provided by the x-ray tube and its electrical
supply.
Tube - CORRECT ANSWER✔✔- cathode (negative terminal) and anode (positive terminal)
in glass envelope to maintain the vacuum needed for optimal x-ray production
Cathode's filament - CORRECT ANSWER✔✔- thoriated tungsten which provides the
source of electrons.
Kilovoltage - CORRECT ANSWER✔✔- applied to the filament accelerates the stream of
electrons toward the anode end. X-rays are produced when the electrons strike the anode
(energy conversion) and produces x-rays and heat. Heterogeneous (has many energies) -
measure in kiloelectron volts (keV). This is the primary beam and it is directed toward the
patient through a window in the tube.
Three possibilities when x-rays strike matter: - CORRECT ANSWER✔✔- Can be absorbed
Can transfer some energy and then scatter
Can pass through unaffected
Interactions with matter - CORRECT ANSWER✔✔- Classic coherent scattering
Photoelectric interactions
Compton scattering (the Compton effect)
Pair production
Photodisintegration
