Radiologic Science for Technologists: review for physics exam (lacey) Flashcards

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created 6 weeks ago by Lacey
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Chapter 1 -8
updated 6 weeks ago by Lacey
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1

Potential energy

Is the ability to do work by virtue of position

Energy is measured in joules

2

Energy

Is the ability to do work

Energy is measured in joules

3

Ionization

Is the removal of an electron from an atom

4

Example electromagnetic radiation

Gamma rays

Radio waves

X-rays

Microwaves

Ultraviolet

5

Examples of particulates radiation

Alpha particulate and Beta particulate

6

Natural environmental radiation

• Natural environment radiation: 3 mSv/yr
• Cosmic rays: Sun & stars
• Terrestrial radiation: Deposits of uranium, thorium & other radionuclides in earth
• internally deposited radionuclides: Potassium-40
• Radon: affect us by giving us lung cancer
7

Radon

• is a radioactive gas that is produced by the natural radioactive decay of uranium.
• it emits alpha particles and contributes radiation dose to the lungs.
8

Unit of exposure

Air kerma/C/kg

Roentgen

9

rem

Unit of occupational dose

10

Curie or becquerel

Unit of radioactivity

11

Power

the quotient of work divided by time

P=W/ T=FD/T

SI unit: joule/seconds which is watt (w)

british unit: horsepower (hp)

12

Temperature Conversions

• Tc =5/9(Tf -32)
• Tf = 9/5 Tc + 32
• Tk = Tc + 273
• Tc = Tk - 273
13

Law of conservation of energy

a law of science that states that energy cannot be created or destroyed, but only changed from one form into another or transferred from one object to another

14

Oclet rule

Atoms gain, lose or share electrons with other atoms in order to fill their valence level with eight electrons.

15

Centripetal

Centrifugal

The force that keeps an electron in orbit

Flying out from the center force.

16

Isotopes

Atoms that have the same atomic number but different atomic mass numbers

17

Radioactivity

Radioactivity is the spontaneous emission of particles and energy in order to become stable.

18

Half life

is the time required for a quantity of radioactivity to be reduced to one-half its original value

19

Alpha particle

is a helium nucleus that contains two protons and two neutrons

20

Beta particles

Is an electron emitted from the nucleus of a radioactive atom

21

Gamma rays

come from the nucleus . x-rays come from the electron cloud

22

Photon

An x-ray photon is a quantum of electromagnetic energy

23

Amplitude

Is one half the range from crest to valley over which the sine wave varies

24

Frequency

Is the number of wavelengths that pass a point of observation per second.

25

Wavelength

is the distance from one crest to another, from valley to another or from any point one the sine wave to the next corresponding point

26

Relationship between the frequency an wavelength

Wavelength and frequency are inversely proportional

27

Electrostatics

Is the study of stationary electric charges

28

Electrodynamics

is the study of electric charges in motion

29

REsistance

The degree to which an electric current is opposed

R=V/I

30

Watt

Is the unit of power

31

Magnetic permeability

Is the ability of a material to attract the lines of magnetic field intensity

32

Magnetic susceptibility

is the ability of an object to become magnetized.

33

Ferro magnetic

Ferromagnetic objects can be made into magnets by Induction

34

Units of magnetism

is the tesla

1 Tesla (T)=10000 Gauss

35

Diamagnetic

...

36

Paramagnetic

...