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1

Professor Wilhelm Roentgen:

a. Advocated radiology in the
United States
b. Exposed the first
radiographs in the United
States
c. Discovered the X-ray
d. Employed the first dental
auxiliary in the United States

C. Discovered the X-ray

2

The first sign of x-ray dermatitis (poisoning) is

a. alopecia
b. dry skin
c. erythema
d. None of the above

C. erythema

3

A form of energy is

a. heat
b. light
c. electricity
d. x-radiation
e. all of the above

E. all of the above

4

Photons are described as:

a. bundles of energy
b. dental film mounts
c. electrically neutral
particles
d. negatively charged atomic
particles

A. Bundles of energy

5

Limited penetration long- wavelength radiation is known as:

a. short wavelengths
b. hard radiation
c. soft radiation
d. desirable wavelengths

C. Soft radiation

6

Background radiation originates from:

a. environment
b. outer space
c. radionuclides
d. terrestrial radiation
e. all of the above
f. only a and b

e. all of the above

7

Ionizing radiation produces ions when:

a. radiation passes through
body tissues
b. ions compress into the
atmosphere
c. isotopes flow freely on air
d. none of the above

a. radiation passes through body tissues

8

Common characteristics of radiation are:

a. wavelengths that determine
the penetrating power of
the energy
b. forms of electromagnetic
radiation
c. the giving off of electrical
fields at right angles to the
path of travel
d. straight lines that travel at
186,000 miles per second
e. all of the above

e. all of the above

9

Hard radiation is considered to be the:

1. short wavelengths with great penetrating power
2. long wavelengths with limited penetrating power
3. type of radiation that is most desirable and capable
of penetrating oral
structures
4. type of radiation that is
unsuitable for exposing radiographs
a. 1 and 2
b. 2 and 3
c. 1 and 3
d. 2 and 4

C. 1 and 3
1. short wavelengths with great penetrating power

3. type of radiation that is most desirable and capable
of penetrating oral
structures

10

An electron is defined as:

a. anything that occupies
space and has mass
b. electrically neutral tiny
particle
c. center of the atom
d. negatively charged atomic particle

d. negatively charged atomic particle

11

What are the properties of electromagnetic radiation?

a. Travels at the speed of light
b. No electrical charge and no mass or weight
c. Measurable energies
d. AandB
e. All of the above

e. All of the above

12

Ionizing types of radiation include:

a. Gamma rays
b. Cosmic rays
c. X-rays
d. Only A and B
e. All of the above

e. all of the above

13

X-rays are grouped according to: a. Milliliters
b. Seconds
c. Liters
d. Wavelengths

d. wavelengths

14

The measurement of the number of oscillations per second of electromagnetic radiation is known as:
a. Crest
b. Wavelength
c. Bremsstrahlung d. Frequency

d. frequency

15

X-rays characteristically:
a. travel in straight wavelengths
b. are invisible
c. have no mass
d. only B and C
e. All of the above

e. All of the above

16

A unit measuring ionization in the air is known as:

a. Coulomb per kilogram
b. Gray
c. Sievert
d. Angstrom

a. Coulomb per kilogram

17

A unit measuring the absorption of X-rays on the tissues is defined as:
a. Rad
b. Rem
c. Roentgen
d. Angstrom

b. Rem

18

First intraoral and dental radiograph was produced by:
a. G. V . Black.
b. Horace Wells.
c. Wilhelm Roentgen.
d. Edmund Kells.

d. Edmund Kells

19

Dental radiation CANNOT cause
damage to ALL living cells.

a. True
b. False

A. true

20

The inner core of an atom is termed the:
a. electron.
b. proton.
c. nucleus.
d. molecule.

C. nucleus

21

When x-rays strike patients’ tissues, ionization occurs.
a. True
b. False

A. true

22

The longer the wavelength, the _______ its ability to
penetrate matter.

a. greater
b. less

b. less

23

What type of radiation is given off when the primary beam comes into contact with the bones of the skull and the teeth?
a. Primary
b. Secondary
c. Scatter
d. B and C

D. B and C

Secondary, scatter

24

Position indicator devices (PIDs) are available in which of the following lengths?
a. 8 inches
b. 12 inches
c. 16 inches
d. All of the above
c. Enamel
d. All of the above

d. all of the above

25

The part of an atom that carries a negative charge is a/an:
a. proton.
b. electron.
c. neutron.
d. nucleus.

b. electron

26

Which of the following Standard International Units is equivalent to the rem?
a. Sievert
b. Gray
c. Coulomb/kg
d. Roentgen
e. Rad

a. Sievert

27

The X-rays that are most likely to be absorbed by the skin are X- rays that are

a. deep and penetrating.
b. aluminum-filtered.
c. of long wavelength.
d. of short wavelength.

c. of long wavelength

28

In X-radiation, ionization occurs when
a. cell death takes place.
b. photons penetrate matter.
c. radiant energy is converted
to heat.
d. an electron is displaced
from an atom.

d. An electron is displaced from an atom

29

Which of the following are found in the nucleus of an atom?
1. Protons
2. Neutrons
3. Electrons
a. 1, 2
b. 1, 3
c. 2, 3
d. 1, 2, 3

a. 1,2 (Protons, Neutrons)

30

A Gray (rad) is defined as the

a. number of ions in a cubic
centimeter of air.
b. biologic effects of
radiation damage to tissue.
c. amount of kilovoltage
necessary to expose a
dental radiograph.
d. unit of absorbed dose of
radiation per gram of tissue.

d. unit of absorbed dose of
radiation per gram of tissue.