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Flashcards in Radio ch 2 Deck (45)
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1

ionization

formation of ion pairs

2

particulate radiation

alpha and beta particles

3

name the ionizing types of rays

x-rays, gamma rays, and cosmic rays

4

name 4 properties of energies of the electromagnetic spectrum

travel at the speed of light
have no electrical charge
have no mass or weight
pass through space as particles and in wavelike motion

5

distance between two similar points on two successive waves

wavelength

6

measure of number of waves that pass a given point per unit of time

frequency

7

refers to speed of a wave

velocity

8

6 properties of X rays

are invisible
travel in straight lines
travel at speed of light
have no mass or weight
have no charge
interact with matter causing ionization

9

target metal in production of x rays

tungsten

10

4 interactions to occur when a beam of x rays pass through matter are :

no interaction
coherent scattering
photoelectric effect
compton effect

11

an all or nothing energy loss is what type of interaction

photoelectric effect

12

this interaction causes x rays to be scattered in all directions

compton effect

13

this interaction is when a low energy x ray passes near an atoms outer electron

coherent scattering

14

ionizing radiation that is always present in our environment

background radiation

15

background radiation includes what types:

cosmic radiation
terrestrial radiation
background radiation from radionuclides

16

which state has an increased dose of backgound radiation due to increased cosmic radiation at higher altitude and terestrial radiation from soils

colorado

17

to be radioactive we have to change _________, all we change is the _________

nucleus, electrons

18

name the equivalent dose of measurement

Rem and seivert

19

name the absorbed dose of measurement

gray and Rad

20

the smallest part of an element

atom

21

the smallest part of a substance

molecule

22

the innermost level is referred to as the ?

K shell

23

T or F the world consists of matter

true

24

the emission and movement of energy through space

radiation

25

Characteristic radiation occurs above ____ with a tungtsen target?

70 kVp

26

Cosmic rays, ultraviolet rays, infrared rays are all measured in ______ units

angstrom

27

radio waves and radiation are measured in ____

meters

28

the movement of wavelike energy through space as a combination of electric and magnetic fields

electromagnetic radiation

29

bundles of energy that travel through space at the speed of light

photons

30

1 A is about 1/250,000,000 ___

inches

31

1 A is also equal to 1/100,000,000 __

centimeters

32

the longer the wavelength the ______ the frequency, and has ______ the penetrating power.

lower, less

33

the shorter the wavelength the _______the frequency, and has ________ penetrating power

higher, more

34

these structures are extremely dense and have high atomic weight and appear white or gray on an x ray

radiopaque

35

these structures are less dense,have lower atomic weight and appear ________ or dark gray or black on a x ray

radiolucent

36

is produced when high speed electrons are stopped or slowed down

general/bremsstrahlung

37

a minimum of _________ volts of force is required to dislodge a K electron from an atom

69,000

38

No interaction accounts for what percentage of x rays passing through tissue

9 %

39

coherent scattering accounts for what percentage ?

8 %

40

photoelectric effect accounts for what percentage

30%

41

compton effect accounts for what percentage?

60%

42

A ______ is a unit of electrical charge

coulomb

43

dental and medical x rays make up approximately ____% of the total radiation

5

44

nuclear medicine account for _____% of total radiation

48

45

background radiation ingestion accounts for ____% of total radiation

50