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RAD100Chapter9 Terms

Chapter 9 Terms

TermDefinition
X-rays Form of electromagnetic radiation traveling at the speed of light, possessing the ability to penetrate matter
Somatic Cells All of the body’s cells except germ cells
Sievert (Sv) Unit in the International System used to measure the dose equivalence, or biologic effectiveness, of differing radiations; 1 Sv = 100 rem
Radiation Forms of energy emitted and transferred through matter
Photoelectric Interaction Interaction with matter in which a photon strikes an inner shell electron, causing its ejection from orbit with the complete absorption of the photon’s energy
Kiloelectron Volts (keV) Units of energy equal to 1000 electron volts
International System (SI) of Units System of units based on metric measurement developed in 1948 and having units used to measure radiation
Gray (Gy) Unit in the International System used to measure the amount of energy absorbed in any medium; 1 Gy = 100 radiation absorbed doses
Germ Cells Cells of an organism whose function is to reproduce the organism (e.g., ovum, spermatozoa)
Exposure (X) the amount of radiation delivered to a point. Measured in coulomb per kilogram.
Curie (Ci) Unit of radioactivity defined as the quantity of any radioactive nuclide in which the number of disintegrations per second is 3.7 × 1010
Compton Scattering Interaction with matter in which a higher energy photon strikes a loosely bound outer electron, removing it from its shell, and the remaining energy is released as a scattered photon
Classic Coherent Scattering Interaction with matter in which a low-energy photon (below 10 kiloelectron volts) is absorbed and released with its same energy, frequency, and wavelength but with a change of direction
Becquerel (Bq) Unit of radioactivity in the International System of Units, equal to one disintegration per second
ALARA Mnemonic meaning to keep all radiation exposure as low as reasonably achievable
Air Kerma SI quantity used to measure energy transferred from radiation to matter, which may be at the surface of a patient’s or radiologic and imaging sciences professional’s body
Umbra True edge of an object as imaged radiographically
Created by: user-2016295
 

 



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