LXMO CORE EXAM QUESTIONS AND
ANSWERS 100% PASS.
Focusing Cup - ANS Directs electrons toward target
Thermionic Emission - ANS Filament electrons are boiled off producing an electron cloud
Bremsstrahlung - ANS AKA Breaking Radiation. Occurs when a high speed electron from the
cathode is deflected by the nucleus of a target atom
Characteristic Radiation - ANS Occurs when cathode electrons dislodge inner orbit electrons
from the target atoms.
Anode Heel Affect - ANS Reduction of beam intensity due to interaction with heel of target
Quality - ANS Refers to penetrating power of the beam
Quantity - ANS Refers to the number of xray photons in the useful beam
Primary Beam - ANS Beam exiting the tube before it gets to the patient
Remnant Radiation - ANS Photons that are exiting patient before getting to the IR
2026 STUDY MATERIAL @COPYRIGHT RESERVED 1
, Inverse Square Law - ANS Intensity is inversely proportional to the square of the distance
Attenuation - ANS Absorption of the beam by the patient
Compton Effect - ANS Incident xray interacts with outer shell electron and ionizes the atom
Compton Effect - ANS What is the single most contribution to occupational exposure?
Photoelectric Absorption - ANS Incident xray is totally absorbed during the exposure, K shell
electron is ejected.
Coherent Scatter - ANS Incident xray interacts with target atom, atom becomes excited and
releases energy in the same wavelength as original but in a different direction
Deterministic - ANS A high dose of radiation renders an early response
Stochastic - ANS A low dose of radiation renders a late response
Linear - ANS Radiation dose is directly proportional to the response
Non-Linear - ANS Varied responses from varied doses
Non-Threshold - ANS Any dose produces a response
Threshold - ANS Response happens only above a certain radiation level
Direct Effect - ANS If radiation ionization occurs on the target DNA then it is considered this
2026 STUDY MATERIAL @COPYRIGHT RESERVED 2
ANSWERS 100% PASS.
Focusing Cup - ANS Directs electrons toward target
Thermionic Emission - ANS Filament electrons are boiled off producing an electron cloud
Bremsstrahlung - ANS AKA Breaking Radiation. Occurs when a high speed electron from the
cathode is deflected by the nucleus of a target atom
Characteristic Radiation - ANS Occurs when cathode electrons dislodge inner orbit electrons
from the target atoms.
Anode Heel Affect - ANS Reduction of beam intensity due to interaction with heel of target
Quality - ANS Refers to penetrating power of the beam
Quantity - ANS Refers to the number of xray photons in the useful beam
Primary Beam - ANS Beam exiting the tube before it gets to the patient
Remnant Radiation - ANS Photons that are exiting patient before getting to the IR
2026 STUDY MATERIAL @COPYRIGHT RESERVED 1
, Inverse Square Law - ANS Intensity is inversely proportional to the square of the distance
Attenuation - ANS Absorption of the beam by the patient
Compton Effect - ANS Incident xray interacts with outer shell electron and ionizes the atom
Compton Effect - ANS What is the single most contribution to occupational exposure?
Photoelectric Absorption - ANS Incident xray is totally absorbed during the exposure, K shell
electron is ejected.
Coherent Scatter - ANS Incident xray interacts with target atom, atom becomes excited and
releases energy in the same wavelength as original but in a different direction
Deterministic - ANS A high dose of radiation renders an early response
Stochastic - ANS A low dose of radiation renders a late response
Linear - ANS Radiation dose is directly proportional to the response
Non-Linear - ANS Varied responses from varied doses
Non-Threshold - ANS Any dose produces a response
Threshold - ANS Response happens only above a certain radiation level
Direct Effect - ANS If radiation ionization occurs on the target DNA then it is considered this
2026 STUDY MATERIAL @COPYRIGHT RESERVED 2
