DANB -- Radiology Health and Safety Mock Exam Prep

When the electrons strike the target, ____________________ are generated.

• 50% x-rays and 50% heat

• 99% heat and 1% x-rays

• 1% heat and 99% x-rays

• 100 % heat and 0% x-ray

The x-ray was discovered in 1895 by

• John Greenwood.

• Wilhelm Conrad Roentgen.

• Edmund Kells.

• G.V. Black.

______is credited with the first practical use of radiographs on a live patient in dentistry in 1896.

• Otto Walkhoff

• C. Edmund Kells

• Wilhelm Conrad Roentgen

• W. H. Rollins

_______was a pioneer in the field of radiation safety, and we follow his basic principles to this day.

• W. H Rollins

• C. Edmund Kells

• Wilhelm Conrad Roentgen

• Otto Walkhoff

The time lapse from x-ray exposure until noticeable damage occurs is known as

• chronic exposure.

• the cumulative period.

• the latent period.

• None of the above

Which of the following terms is used to describe the energy or penetrating ability of the x-ray beam in dental radiography?

• Quantity

• Quality

• Collimation

• Density

If you change the exposure time of the x-ray unit, what is affected?

• Energy of the beam

• Wavelength of the x-rays

• Number of x-rays produced

• Penetrability of the x-rays

Thermionic emission refers to the

• slamming of electrons against the target.

• release of electrons from the tungsten filament.

• ions formed in the x-ray tube by the loss of electrons.

• change in filament resistance due to heating.

When the master switch is on

• the electron cloud is created around the tungsten filament.

• the red emission light will illuminate.

• x-rays are being produced.

• Photons travel from the cathode to the anode in the tubehead.

The term ____________ is used to describe areas that appear dark on the image; ___________ is the term used to describe areas that appear white or light gray.

• radiopaque; radiolucent

• radiolucent; radiopaque

• contrast; density

• density; contrast