Radiographic Physics and Imaging Chapter Key Terms

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1

A skin reddening and inflammation caused by prolonged exposure to ionizing radiation

Acute Radiodermatitis

2

A partial vacuum tube that produced an electron stream and was used to study cathode rays and led to the discovery of x-rays

cathode ray tube

3

The combinations of fundamental quantities to form velocity, acceleration, force, momentum, work, and power

derived quantities

4

A device that allows dynamic x-ray examination using x-rays and a fluorescent screen

fluoroscope

5

The foundation units of measure of mass, length, and time

fundamental quantities

6

Radiation with sufficient energy to ionize atoms

ionizing radiation

7

Medical imaging equipment that is designed to be easily transportable and can be taken to the patient's bedside, the emergency department, surgery, or wherever it may be needed.

mobile equipment

8

Medical imaging equipment that is fixed in place in a specially designed and shielded room

permanently installed equipment

9

The special radiologic science category of measure for dose, dose equivalent, exposure, and radioactivity.

radiologic quantities

10

Atom

the basic building block of matter composed of electrons, protons, and neutrons

11

Atomic mass

the number of protons and neutrons an atom has in its nucleus

12

Atomic number

the number of protons and atom contains in its nucleus

13

binding energy

a force of attraction that holds the nucleus of an atom together and holds the electrons in orbit around the nucleus. Also refers to the amount of energy necessary to split an atom.

14

compound

the combination of elements in definite proportions.

15

covalent bond

An atomic bond in which an outermost electron from one atom begins to orgit the nucleus of another adjacent atom in addition to its original nucleus.

16

electron

subatomic particle with one unit of negative electrical charge and a mass of 9.109 x 10-31 kg.

17

electron shell

a defined energy level at a distance from the nucleus within which electrons orbit.

18

element

a substance that can not be broken down into simpler parts by ordinary chemical meansl

19

ionic bond

an atomic bond in which one atom gives up an electron and another atom takes the extra electron and the difference in their electrical charge attracts and bonds the two together.

20

molecule

fixed ratios of each type of constituent atom resulting i a predictable mass

21

neutron

subatomic particle with no electrical charge and a mass of 1.675 x 10-27 kg

22

nucleus

the central core of an atom made up fundamentally of protons and neutrons.

23

proton

subatomic particle with one unit of positive electrical charge