LXMO CORE EXAM QUESTIONS AND ANSWERS LATEST UPDATE 2025 ALREADY PASSED
Focusing Cup - Answers Directs electrons toward target
Thermionic Emission - Answers Filament electrons are boiled off producing an electron cloud
Bremsstrahlung - Answers AKA Breaking Radiation. Occurs when a high speed electron from the cathode
is deflected by the nucleus of a target atom
Characteristic Radiation - Answers Occurs when cathode electrons dislodge inner orbit electrons from
the target atoms.
Anode Heel Affect - Answers Reduction of beam intensity due to interaction with heel of target
Quality - Answers Refers to penetrating power of the beam
Quantity - Answers Refers to the number of xray photons in the useful beam
Primary Beam - Answers Beam exiting the tube before it gets to the patient
Remnant Radiation - Answers Photons that are exiting patient before getting to the IR
Inverse Square Law - Answers Intensity is inversely proportional to the square of the distance
Attenuation - Answers Absorption of the beam by the patient
Compton Effect - Answers Incident xray interacts with outer shell electron and ionizes the atom
Compton Effect - Answers What is the single most contribution to occupational exposure?
Photoelectric Absorption - Answers Incident xray is totally absorbed during the exposure, K shell
electron is ejected.
Coherent Scatter - Answers Incident xray interacts with target atom, atom becomes excited and releases
energy in the same wavelength as original but in a different direction
Deterministic - Answers A high dose of radiation renders an early response
Stochastic - Answers A low dose of radiation renders a late response
Linear - Answers Radiation dose is directly proportional to the response
Non-Linear - Answers Varied responses from varied doses
Non-Threshold - Answers Any dose produces a response
Threshold - Answers Response happens only above a certain radiation level
Direct Effect - Answers If radiation ionization occurs on the target DNA then it is considered this
Focusing Cup - Answers Directs electrons toward target
Thermionic Emission - Answers Filament electrons are boiled off producing an electron cloud
Bremsstrahlung - Answers AKA Breaking Radiation. Occurs when a high speed electron from the cathode
is deflected by the nucleus of a target atom
Characteristic Radiation - Answers Occurs when cathode electrons dislodge inner orbit electrons from
the target atoms.
Anode Heel Affect - Answers Reduction of beam intensity due to interaction with heel of target
Quality - Answers Refers to penetrating power of the beam
Quantity - Answers Refers to the number of xray photons in the useful beam
Primary Beam - Answers Beam exiting the tube before it gets to the patient
Remnant Radiation - Answers Photons that are exiting patient before getting to the IR
Inverse Square Law - Answers Intensity is inversely proportional to the square of the distance
Attenuation - Answers Absorption of the beam by the patient
Compton Effect - Answers Incident xray interacts with outer shell electron and ionizes the atom
Compton Effect - Answers What is the single most contribution to occupational exposure?
Photoelectric Absorption - Answers Incident xray is totally absorbed during the exposure, K shell
electron is ejected.
Coherent Scatter - Answers Incident xray interacts with target atom, atom becomes excited and releases
energy in the same wavelength as original but in a different direction
Deterministic - Answers A high dose of radiation renders an early response
Stochastic - Answers A low dose of radiation renders a late response
Linear - Answers Radiation dose is directly proportional to the response
Non-Linear - Answers Varied responses from varied doses
Non-Threshold - Answers Any dose produces a response
Threshold - Answers Response happens only above a certain radiation level
Direct Effect - Answers If radiation ionization occurs on the target DNA then it is considered this
