Basic Of Radiation Quiz 1 Flashcards
EMR IN ORDER
Most ENERGETIC to LEAST
1) XRays/Gamma rays
2)Ultraviolet
3)Visible light
4)Infrared
5)Microwaves
6)Radio wave
What is Radiation?
Transfer or energy
Energy that is emitted and transferred through space
What is Exposed (irradiated)?
Matter that intercepts radiation and absorbs all or some of it
(Does not necessarily mean harm or injury)
What is ionizing radiation or ionization?
Removal of an electron from an atom
What are forms of EMR that can ionize matter?
X-rays
Gamma rays
High energy UV (UVC)
UV-C light is too…
short to go past our ozone layer
What are two main categories of ionizing radiation?
Natural Environment and Man-made
Types of Natural Radiation
-Cosmic radiation
-Terrestrial Radiation
-Internally Deposited Radionuclides
What is cosmic radiation?
EMR emitted from the sun and stars
-The intensity increases with altitude and latitude when closer to equator
What is terrestrial radiation?
Its radiation that comes from the earth
-Has deposits of Uranium, Thorium, and other radionuclides
What is the largest source of natural radiation?
Radon
What is internally deposited radionuclides?
they are radionuclides that are incorporated into the body through ingestion, inhalation, injection, implants.
What is the main source of internally deposited radionuclides?
Potassium 40 which is found in food, water, and soil
How is radon produced?
Gas produced by natural decay of uranium
Types of man-made radiation
-X rays
-Nuclear power generators
-Exit signs
-Smoke detectors
When was the discovery of x-rays?
November 8, 1895
Who was the person who discovered xrays?
Wilhelm Rontgen
Examples of reports of early radiation
-Skin damage
-Loss of hair
-Anemia
Later effects
Blood disorders
What is a filter or filtration?
A device that removes low energy x ray photons that have no diagnostic value and don’t contribute to image quality
What is collimation/collimator?
Its a radiation safety device underneath the xray tube where the radiation is being directed