LXMO CORE
1. Focusing Cup Directs electrons toward target
2. Thermionic Emis- Filament electrons are boiled off producing an electron
sion cloud
3. Bremsstrahlung AKA Breaking Radiation. Occurs when a high speed elec-
tron from the cathode is deflected by the nucleus of a
target atom
4. Characteristic Ra- Occurs when cathode electrons dislodge inner orbit elec-
diation trons from the target atoms.
5. Anode Heel Affect Reduction of beam intensity due to interaction with heel
of target
6. Quality Refers to penetrating power of the beam
7. Quantity Refers to the number of xray photons in the useful beam
8. Primary Beam Beam exiting the tube before it gets to the patient
9. Remnant Radia- Photons that are exiting patient before getting to the IR
tion
10. Inverse Square Intensity is inversely proportional to the square of the
Law distance
11. Attenuation Absorption of the beam by the patient
12. Compton Effect Incident xray interacts with outer shell electron and ion-
izes the atom
13. Compton Effect What is the single most contribution to occupational ex-
posure?
14. Photoelectric Ab- Incident xray is totally absorbed during the exposure, K
sorption shell electron is ejected.
15. Coherent Scatter
1/6
, LXMO CORE
Incident xray interacts with target atom, atom becomes
excited and releases energy in the same wavelength as
original but in a different direction
16. Deterministic A high dose of radiation renders an early response
17. Stochastic A low dose of radiation renders a late response
18. Linear Radiation dose is directly proportional to the response
19. Non-Linear Varied responses from varied doses
20. Non-Threshold Any dose produces a response
21. Threshold Response happens only above a certain radiation level
22. Direct Effect If radiation ionization occurs on the target DNA then it is
considered this
23. Indirect Effect If radiation ionization occurs on a distant noncritical mole-
cule which then transfers its energy to the target molecule
it is considered this
24. Law of Bergonie Radiosensitivity is a function of the metabolic state of the
and Tribondeau tissue being irradiated
25. Linear Energy Rate at which energy is transferred from the ionizing
Transfer radiation to soft tissue
26. Oxygen Effect Tissue is more sensitive to radiation when irradiated in
the oxygenated aerobic state.
27. Short Term Effect Associated within 3 months of exposure
28. Greater than 500 At what does are short term effects noted?
mGy
29. Long Term Effects Occur several years after exposure
30. Latent effects Long term effects are also known as what
2/6
1. Focusing Cup Directs electrons toward target
2. Thermionic Emis- Filament electrons are boiled off producing an electron
sion cloud
3. Bremsstrahlung AKA Breaking Radiation. Occurs when a high speed elec-
tron from the cathode is deflected by the nucleus of a
target atom
4. Characteristic Ra- Occurs when cathode electrons dislodge inner orbit elec-
diation trons from the target atoms.
5. Anode Heel Affect Reduction of beam intensity due to interaction with heel
of target
6. Quality Refers to penetrating power of the beam
7. Quantity Refers to the number of xray photons in the useful beam
8. Primary Beam Beam exiting the tube before it gets to the patient
9. Remnant Radia- Photons that are exiting patient before getting to the IR
tion
10. Inverse Square Intensity is inversely proportional to the square of the
Law distance
11. Attenuation Absorption of the beam by the patient
12. Compton Effect Incident xray interacts with outer shell electron and ion-
izes the atom
13. Compton Effect What is the single most contribution to occupational ex-
posure?
14. Photoelectric Ab- Incident xray is totally absorbed during the exposure, K
sorption shell electron is ejected.
15. Coherent Scatter
1/6
, LXMO CORE
Incident xray interacts with target atom, atom becomes
excited and releases energy in the same wavelength as
original but in a different direction
16. Deterministic A high dose of radiation renders an early response
17. Stochastic A low dose of radiation renders a late response
18. Linear Radiation dose is directly proportional to the response
19. Non-Linear Varied responses from varied doses
20. Non-Threshold Any dose produces a response
21. Threshold Response happens only above a certain radiation level
22. Direct Effect If radiation ionization occurs on the target DNA then it is
considered this
23. Indirect Effect If radiation ionization occurs on a distant noncritical mole-
cule which then transfers its energy to the target molecule
it is considered this
24. Law of Bergonie Radiosensitivity is a function of the metabolic state of the
and Tribondeau tissue being irradiated
25. Linear Energy Rate at which energy is transferred from the ionizing
Transfer radiation to soft tissue
26. Oxygen Effect Tissue is more sensitive to radiation when irradiated in
the oxygenated aerobic state.
27. Short Term Effect Associated within 3 months of exposure
28. Greater than 500 At what does are short term effects noted?
mGy
29. Long Term Effects Occur several years after exposure
30. Latent effects Long term effects are also known as what
2/6
