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