2

2 sources of ionizing radiation

natural environmental radiation results in an annual dose of approximately _

Man-made radiation results in _ annually dose

it is the unit of effective dose

natural environmental radiation consists of 4 components: CTIR

are particulate and electromagnetic radiation emitted by sun and stars

results from deposits of uranium, thorium, and other radionuclides in the earth

mainly potassium-40, are natural metabolites

largest source of natural environmental radiation. it is a radioactive gas that is produced by the natural radioactive decay of uranium

radon emits _ which are not penetrating, and therefore contributes a radiation dose only to the lung

constitute the largest man-made source of ionizing radiation

the currently accepted approximate annual dose resulting from medical applications of ionizing radiation is

during the 1870s and 1880s, many university physics laboratories were investigating the conduction of _

large, partially evacuated glass tube

he was an Englishman from a rather humble background who was self-taught genius

on _, roentgen was working in his physics laboratory at wurzburg university in germany

a plate coated with _ _, a fluorescent material, happened to be lying on a bench top several meters from the crooes tube

the glow is called

in _, roentgen received the first nobel prize in physics

roentgen produced and published the first medical x-ray image in early _

3 general types of x-ray examinations:

radiography uses _ or _ and usually an x-ray tube mounted from the ceiling on a track that allows the tube to be moved in any direction

is usually conducted with an x-ray tube located under the examination table

uses a rotating x-ray source and detector array

x-ray voltages are measured in

x-ray currents are measured in