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UNIT ONE RAD 201

CHAPTER ONE AND FOUR

QuestionAnswer
radiation transfer of energy
decay breakdown of radioactive substances
ionizing positive and negative charges created when radiation passes through matter
biological damage damage caused to cells, tissues, molecules within the body by radiation exposure
terrestrail source natural source of radiation from radioactive materials in the earth. ex uranium, thorium, potassium
radon gas produced from the decay of uranium that can pentrate soil and enter buildings through basement; small traces are found within the earth
extraterrestrial source cosmic radiation from the sun and stars; as the altitude increases radiation levels increases; radiation levels are greater at the north and south poles
artificial source man-made; x-ray, airport surveillance; accounts for 65 mr. per year
patient dose indicated as skin dose, organ dose, and fetal dose; amount of radiation the patient receives
erythema skin reddening
skin erythema dose amount of exposure that causes reddening of the skin
Roentgen(R) unit of exposure in air
exposure volume of air irradiatied with x-ray or gamma rays causing air to become ionized
RAD traditional unit; radiation absorbed dose; the amount of energy unit mass absorbed by an irradiated object
REM traditional unit of effective dose; radiation equivalent in man; used to calculated occupational exposure; also uded for radiation protection purposes; takes into account the biological effects of radiation exposure
Gray Si unit; similar to RAD
Sievert Si unit; used to measure occupational exposure of effective dose; similar to REM
LET Linear Energy transfer
ICRU International Commission on Radiological Units and Measurement; created 1925; first standard of measurements
November 8, 1895 Roentgen announced his discovery of x-ray
December 28, 1895 Roentgen wrote a report call "a New kind of Ray"
Michael Pupin Professor at Columbia University developed intensifying screens and use in conjunction with glass plates in 1896
1904 Thomas Edison's assistant had to have his hands cut off because of cancer from holding the intensifying screens
Created by: 1410760211