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