Radiation Physics Chapter 2 Exam Questions and Answers With Verified
Solutions 2025
Absorption - ✔✔Refers to the total transfer of energy from the x-ray photon to the atoms of matter
through which the x-ray beam passes. And depends on the energy of the x-ray beam and the
composition of the absorbing matter of tissues
Alpha particles - ✔✔These are emitted from the nuclei of heavy metals and exist as 2 protons and
neutrons, without electrons
Aluminum disks - ✔✔sheets of 0.5mm thick aluminum placed in the path of the x-ray beam—filter out
the non-penetrating, longer wavelength x-rays
Amperage - ✔✔the measurement of the number of electrons moving through a conductor
Ampere (A) - ✔✔Current is measured in this or in miliamperes (mA)
Anode - ✔✔positive electrode, consist of a wafer-thin tungsten plate embedded in a solid copper rod.
Atom - ✔✔The fundamental unit of matter
Neutral atom - ✔✔An atom that contains an equal number of protons (positive charges) and electrons
(negative charges).
Atomic number - ✔✔The number of protons inside the nucleus equals the number of electrons outside
the nucleus and determines this.
Atomic weight - ✔✔The number of protons and neutrons in the nucleus of an atom determines this or
the mass number
,Autotransformer - ✔✔serves as a voltage compensator that corrects for minor fluctuations in the
current.
Beta particles - ✔✔Fast moving electrons emitted from the nucleus of radioactive atoms
Binding energy - ✔✔Also known as binding force of an electron
-This is determined by the distance between the nucleus and the orbiting electron and is different for
each shell.
-The strongest of these is found closest to the nucleus in the K shell, whereas electrons located in the
outer shells have a weak binding energy.
Bremsstrahlung (braking radiation) - ✔✔A form of radiation that occurs when speeding electrons slow
down because of their interactions with the tungsten target in the anode also known as general
radiation
Cathode - ✔✔Negative electrode, consists of a tungsten wire filament in a cup-shaped holder made of
molybdenum
Cathode ray - ✔✔streams of high-speed electrons that originate in an x-ray tube
Circuit - ✔✔a path of electrical current.
Filament Circuit - ✔✔The circuit that regulates the flow of electrical current to the filament of the x-ray
tube; controlled by the miliampere settings (also known as low-voltage circuit)
High-voltage circuit - ✔✔The circuit that provides the high voltage required to accelerate electrons and
to generate x-rays in the x-ray tube; controlled by the kilovoltage settings
Coherent scatter - ✔✔Another type of scatter radiation that may take place when x-rays interact with
matter is known as this or unmodified scatter. This type of radiation involves an x-ray photon that has its
path altered by matter. This occurs when a low-energy x-ray photon interacts with an outer-shell
electron. No change in the atom occurs, and an x-ray photon of scattered radiation is produced.
,Compton electron - ✔✔The x-ray photon loses energy and continues in a different direction (scatters) at
a lower energy level. The new, weaker x-ray photon interacts with other atoms until all its energy is
gone. The ejected electron is termed this or recoil electron, and has a negative charge. The remaining
atom is positively charged.
Compton scatter - ✔✔An x-ray photon collides with a loosely bound, outer shell electron and gives up
part of its energy to eject the electron form its orbit.
Control panel - ✔✔Panel contains an on-off switch and an indicator light, an exposure button and
indicator light, and control devices (time, kilovoltatge, and milliamperage slectors) to regulate the x-ray
beam.
Copper stem - ✔✔which functions to dissipate the heat away from the tungsten target.
Alternating Current (AC) - ✔✔describes an electrical current in which the electrons flow in 2, opposite
directions
Direct Current (DC) - ✔✔Electrical current is termed this when the electrons flow in one direction
through the conductor
Electrical current - ✔✔Electrical energy consists of a flow of electrons through a conductor; this flow is
known as this
Electricity - ✔✔energy that is used to make x-rays.
Electromagnetic spectrum - ✔✔Electromagnetic radiations are arranged according to their energies in
what is termed this type of spectrum
Electron - ✔✔Tiny, negatively charged particles that have very little mass.
Weighs approximately 1/1800 as much as a proton or neutron.
, Electron volt (eV) - ✔✔The binding energies of orbital electrons are measured in this or kilo electron
volts (keV)
Electrostatic force - ✔✔Electrons are maintained in their orbits by this force or attraction, between the
positive nucleus and the negative electrons.
Element - ✔✔Substances made up of only one type of atom
Energy - ✔✔When matter is altered
Extension arm - ✔✔A part of the dental x-ray machine; suspends the x-ray tubehead and houses
electrical wires that extend from the control panel to the tubehead.
Frequency - ✔✔Refers to the number of wavelengths that pass a given point in a certain amount of time
Insulating oil - ✔✔The oil that surrounds the x-ray tube and transformers inside the tubehead -prevents
overheating by absorbing the heat created by the production of x-rays.
Ion - ✔✔An atom that gains or loses an electron and becomes electrically unbalanced
Ion pair - ✔✔Results when an electron is removed from an atom in the ionization process. The atom
becomes the positive ion, and the ejected electron becomes the negative ion. This structure reacts with
other ions until electrically stable, neutral atoms are formed
Ionization - ✔✔The production of ions, or the process of converting an atom into ions
Kilo electron volt (keV) - ✔✔The binding energies of orbital electrons are measured in this or electron
volts (eV)
-(one Kilo electron volt = 1000 elctron volts)
-1000 electron volts; the unit of measurement for the binding energies of orbital electrons
Solutions 2025
Absorption - ✔✔Refers to the total transfer of energy from the x-ray photon to the atoms of matter
through which the x-ray beam passes. And depends on the energy of the x-ray beam and the
composition of the absorbing matter of tissues
Alpha particles - ✔✔These are emitted from the nuclei of heavy metals and exist as 2 protons and
neutrons, without electrons
Aluminum disks - ✔✔sheets of 0.5mm thick aluminum placed in the path of the x-ray beam—filter out
the non-penetrating, longer wavelength x-rays
Amperage - ✔✔the measurement of the number of electrons moving through a conductor
Ampere (A) - ✔✔Current is measured in this or in miliamperes (mA)
Anode - ✔✔positive electrode, consist of a wafer-thin tungsten plate embedded in a solid copper rod.
Atom - ✔✔The fundamental unit of matter
Neutral atom - ✔✔An atom that contains an equal number of protons (positive charges) and electrons
(negative charges).
Atomic number - ✔✔The number of protons inside the nucleus equals the number of electrons outside
the nucleus and determines this.
Atomic weight - ✔✔The number of protons and neutrons in the nucleus of an atom determines this or
the mass number
,Autotransformer - ✔✔serves as a voltage compensator that corrects for minor fluctuations in the
current.
Beta particles - ✔✔Fast moving electrons emitted from the nucleus of radioactive atoms
Binding energy - ✔✔Also known as binding force of an electron
-This is determined by the distance between the nucleus and the orbiting electron and is different for
each shell.
-The strongest of these is found closest to the nucleus in the K shell, whereas electrons located in the
outer shells have a weak binding energy.
Bremsstrahlung (braking radiation) - ✔✔A form of radiation that occurs when speeding electrons slow
down because of their interactions with the tungsten target in the anode also known as general
radiation
Cathode - ✔✔Negative electrode, consists of a tungsten wire filament in a cup-shaped holder made of
molybdenum
Cathode ray - ✔✔streams of high-speed electrons that originate in an x-ray tube
Circuit - ✔✔a path of electrical current.
Filament Circuit - ✔✔The circuit that regulates the flow of electrical current to the filament of the x-ray
tube; controlled by the miliampere settings (also known as low-voltage circuit)
High-voltage circuit - ✔✔The circuit that provides the high voltage required to accelerate electrons and
to generate x-rays in the x-ray tube; controlled by the kilovoltage settings
Coherent scatter - ✔✔Another type of scatter radiation that may take place when x-rays interact with
matter is known as this or unmodified scatter. This type of radiation involves an x-ray photon that has its
path altered by matter. This occurs when a low-energy x-ray photon interacts with an outer-shell
electron. No change in the atom occurs, and an x-ray photon of scattered radiation is produced.
,Compton electron - ✔✔The x-ray photon loses energy and continues in a different direction (scatters) at
a lower energy level. The new, weaker x-ray photon interacts with other atoms until all its energy is
gone. The ejected electron is termed this or recoil electron, and has a negative charge. The remaining
atom is positively charged.
Compton scatter - ✔✔An x-ray photon collides with a loosely bound, outer shell electron and gives up
part of its energy to eject the electron form its orbit.
Control panel - ✔✔Panel contains an on-off switch and an indicator light, an exposure button and
indicator light, and control devices (time, kilovoltatge, and milliamperage slectors) to regulate the x-ray
beam.
Copper stem - ✔✔which functions to dissipate the heat away from the tungsten target.
Alternating Current (AC) - ✔✔describes an electrical current in which the electrons flow in 2, opposite
directions
Direct Current (DC) - ✔✔Electrical current is termed this when the electrons flow in one direction
through the conductor
Electrical current - ✔✔Electrical energy consists of a flow of electrons through a conductor; this flow is
known as this
Electricity - ✔✔energy that is used to make x-rays.
Electromagnetic spectrum - ✔✔Electromagnetic radiations are arranged according to their energies in
what is termed this type of spectrum
Electron - ✔✔Tiny, negatively charged particles that have very little mass.
Weighs approximately 1/1800 as much as a proton or neutron.
, Electron volt (eV) - ✔✔The binding energies of orbital electrons are measured in this or kilo electron
volts (keV)
Electrostatic force - ✔✔Electrons are maintained in their orbits by this force or attraction, between the
positive nucleus and the negative electrons.
Element - ✔✔Substances made up of only one type of atom
Energy - ✔✔When matter is altered
Extension arm - ✔✔A part of the dental x-ray machine; suspends the x-ray tubehead and houses
electrical wires that extend from the control panel to the tubehead.
Frequency - ✔✔Refers to the number of wavelengths that pass a given point in a certain amount of time
Insulating oil - ✔✔The oil that surrounds the x-ray tube and transformers inside the tubehead -prevents
overheating by absorbing the heat created by the production of x-rays.
Ion - ✔✔An atom that gains or loses an electron and becomes electrically unbalanced
Ion pair - ✔✔Results when an electron is removed from an atom in the ionization process. The atom
becomes the positive ion, and the ejected electron becomes the negative ion. This structure reacts with
other ions until electrically stable, neutral atoms are formed
Ionization - ✔✔The production of ions, or the process of converting an atom into ions
Kilo electron volt (keV) - ✔✔The binding energies of orbital electrons are measured in this or electron
volts (eV)
-(one Kilo electron volt = 1000 elctron volts)
-1000 electron volts; the unit of measurement for the binding energies of orbital electrons
