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VCU Dental Radiation Safety Certification Exam Questions and Answers
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  • Module
  • Radiation safety
  • Institution
  • Radiation Safety

Who discovered X-Rays? - Answer-Wilhelm Roentgen When did Wilhelm Roentgen discover X-Rays? - Answer-November 8th 1895 Did Wilhelm Roentgen discover X-Rays on purpose? - Answer-No, it was by accident What was the first X-Ray tube known as? - Answer-Known as a Crooke's Tube or Cathode Ray T...

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  • October 10, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • vcu dental radiation safety certification exam que
  • who discovered x rays answer wilhelm roentgen

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VCU Dental Radiation Safety
Certification Exam Questions and
Answers
Who discovered X-Rays? - Answer-Wilhelm Roentgen

When did Wilhelm Roentgen discover X-Rays? - Answer-November 8th 1895

Did Wilhelm Roentgen discover X-Rays on purpose? - Answer-No, it was by accident

What was the first X-Ray tube known as? - Answer-Known as a Crooke's Tube or
Cathode Ray Tube

How did the first X-Ray tube work? - Answer-It was an evacuated tube with two
electrodes (cathode and anode) through which an electrical current is passed. Modern
day X-Ray tubes still work on the same basic principle as the Crooke's Tube.

PANIC - Answer-Positive is Anode Negative Is Cathode

What is radiation? - Answer-It is a form of electromagnetic energy emitted and
transferred through matter. It has no mass or charge, it has a wavelength and a
frequency, and travels at the speed of light.

Three requirements for radiation being produced: - Answer-1) source of electrons
2)A way to accelerate the electrons
3)A way to decelerate the electrons very quickly

X-Ray tubes have three main parts: - Answer-Cathode, Anode, and a Pyrex Glass Tube

Cathode: - Answer-A) Source of electrons and negatively charged
B) contains a filament which, when heated, spews off electrons.

Anode: - Answer-A) Attracts the electrons at a great speed, known as the "accelerator".
Positively charged; attract the negatively charged electrons, which gather speed as they
race from cathode to anode.
B) contains a "target" (focal spot) which the electrons smash in to, releasing their
energy as 1% radiation and 99% heat.

Pyrex Glass Tube - Answer-Surrounds the anode and cathode. Maintains a vaccuum
which prevents air from interfering with the traveling electrons.

, Radiobiology - Answer-the field of clinical and basic medical sciences that involves the
study of the action of ionizing radiation on living things, especially health effects of
radiation.

What are the three possible types of interaction of X-Rays with matter? - Answer-
Scatter, Absorption, and Transmission

Scatter - Answer-X-Ray hits patient, but does not enter tissue. New photon of lower
wavelength (energy) travels in a different direction. Source of fog on radiograph and
source of useless radiation to patient.

Absorption - Answer-Some/all of X-Ray energy absorbed by tissue Removes photons
from beam, results in white (radiopaque) areas on the image-Metallic restorations,
cortical bone/enamel

Transmission - Answer-Photon passes completely through patient and strikes image
receptor, resulting in black (radiolucent) areas on the image

Radiolucent - Answer-refers to the portion of a processed radiograph which appears as
dark/black

Radiopaque - Answer-refers to the portion of a processed radiograph that appears
light/white

Ionizing radiation: - Answer-1) Excitation
2) Ionization- radiation which can eject an orbital electron from its shell producing an ion
par- free radical production
3) Breakage of molecular bonds
4) Direct and indirect effects of radiation

Radiosensitivity is determined by four factors: - Answer-1) The metabolic state of the
tissue-the faster cells are dividing in a tissue, the more radiosensitive that tissue is (Law
of Bergonie and Tribondeau); radiosensitive-bone marrow stem cells, sperm, ova;
Radioresistant-nerve and muscle.
2) The rate at which the radiation is delivered (protraction) -the more radiation delivered
at one time, the more cellular damage occurs
3) The amount of time between exposures (fractionation)-the more time between
exposures, the more a tissue can repair itself
4) The size of the area exposed-full body exposure is more damaging than exposure to
a smaller area

Specific tissue sensitivities: - Answer-Most sensitive cells to radiation damage: bone
marrow stem (blood) cells, reproductive cells very sensitive to radiation (sperm and
ova), and corneas and thyroid gland also very sensitive.

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