Review questions 1 Flashcards
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
The first sign of x-ray dermatitis (poisoning) is
a. alopecia
b. dry skin
c. erythema
d. None of the above
C. erythema
A form of energy is
a. heat
b. light
c. electricity
d. x-radiation
e. all of the above
E. all of the above
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
Limited penetration long- wavelength radiation is known as:
a. short wavelengths
b. hard radiation
c. soft radiation
d. desirable wavelengths
C. Soft radiation
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
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
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
Hard radiation is considered to be the:
- short wavelengths with great penetrating power
- long wavelengths with limited penetrating power
- type of radiation that is most desirable and capable
of penetrating oral
structures - 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
- type of radiation that is most desirable and capable
of penetrating oral
structures
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
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
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
X-rays are grouped according to: a. Milliliters
b. Seconds
c. Liters
d. Wavelengths
d. wavelengths
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
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
A unit measuring ionization in the air is known as:
a. Coulomb per kilogram
b. Gray
c. Sievert
d. Angstrom
a. Coulomb per kilogram
A unit measuring the absorption of X-rays on the tissues is defined as:
a. Rad
b. Rem
c. Roentgen
d. Angstrom
b. Rem
First intraoral and dental radiograph was produced by:
a. G. V . Black.
b. Horace Wells.
c. Wilhelm Roentgen.
d. Edmund Kells.
d. Edmund Kells
Dental radiation CANNOT cause
damage to ALL living cells.
a. True
b. False
A. true
The inner core of an atom is termed the:
a. electron.
b. proton.
c. nucleus.
d. molecule.
C. nucleus
When x-rays strike patients’ tissues, ionization occurs.
a. True
b. False
A. true
The longer the wavelength, the _______ its ability to
penetrate matter.
a. greater
b. less
b. less
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
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
The part of an atom that carries a negative charge is a/an:
a. proton.
b. electron.
c. neutron.
d. nucleus.
b. electron
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
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
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
Which of the following are found in the nucleus of an atom?
- Protons
- Neutrons
- Electrons
a. 1, 2
b. 1, 3
c. 2, 3
d. 1, 2, 3
a. 1,2 (Protons, Neutrons)
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.
Which of the following Standard International Units is equivalent to the rad?
a. Sievert
b. Gray
c. Coulomb/kg
d. Roentgen
e. Rad
b. Gray
