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Radiation Intro
Radiology / Medical Assistant
Question | Answer |
---|---|
Who discovered x-rays ? | Roentgen |
What are some properties of x-rays ? | - they are electromagnetic in nature [ just like gamma radiation ] & they produce biologiocal changes & they have a shorter wavelength and higher-energy photon than visible light. |
which basic property of x-ray can cause damage to the human body ? | - they ionize matter |
what causes harmful effects on radiation on the human body ? | - ionization |
describe ionizing radiation | The conversion of atoms to electrically charged particles |
natural radiation | outer space --- the earth -- food |
man made radiation | nucelar medicine --- radiographic procedures --- nuclear weapons |
all of the following can happen when x-ray mix with matter | xray photons pass thru matter and travels in a straight line --- radiant energy is absorbed in matter --- x-ray photons produces images of matter on radiographic film |
steps in x-ray production | --the heated filament produces electrons, --- when elctrons strike a target , sudden decelleration occurs, ----radpid decellerated electrons produce x-rays |
Controlling the qty of X-Rays | Adjust the Ma ( Milliamperes) |
Controlling the Quality of X-Ray | adjust the KVP |
the useful X-ray Beam that contribultes to formation of radiographic image | - Remnant radition |
what radiation is dispersed in all directions by the object being radiographed | - Scatter radiation |
Describes exposure | amount of ionization that occurs in a specified volume of air |
the unit for measuring exposure of radiation in air? | Roentgen |
What is the unit for measuring absorbed dose of radiation ? | Rad |
What is the unit that takes into account of the biological effects ? | Rem |
Dose equivalent is the product of --- | --- absorbed does, & modifying factor, & quality factor |