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RAD100Chapter9 Terms
Chapter 9 Terms
| Term | Definition |
|---|---|
| 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 |