FREE Radiation Health and Safety Questions and Answers


The total energy contained in an x-ray beam in a specified location at a given moment is referred to as ____?

Correct! Wrong!

The total energy contained in the x-ray beam in a particular area at a given point is described as intensity; it is the product of quality and quantity.

The amount of _____ is the half-value layer.

Correct! Wrong!

To reduce the intensity of the second shot to half the value of the first, at least 3.0 mm of aluminum must be used. If this can be accomplished with less aluminum, it is judged that the tube's radiation output at that KVP is insufficient, and servicing is necessary.

Most dental x-ray equipment has a kilovoltage range of _____?

Correct! Wrong!

Most dental x-ray equipment has a range of 65-100kV. Lower settings may not penetrate the tissue sufficiently, resulting in high contrast photos; higher settings may increase the radiation the patient gets, resulting in low contrast images.

The high contrast radiograph was produced with _____ kilovoltage.

Correct! Wrong!

Using a low kilovoltage to generate x-rays will usually result in a radiograph with a high contrast. This is due to the fact that low energy radiation is more easily attenuated. As a result, with low energy radiation, the ratio of photons passed through a thick and thin region will be larger.

The radiograph's overall blackness or darkness

Correct! Wrong!

The overall darkness (blackness) of a picture is defined by its density. The difference in luminance and darkness between regions on a radiograph is referred to as contrast.

What is meant when a radiograph includes a lot of light and dark with few shades of gray areas?

Correct! Wrong!

Radiographic contrast is defined as the difference in densities between different areas on a radiograph. A film with very light and very dark areas gets a high contrast. As there are few shades of gray from one extreme to the other, contrast or a short gray scale is appropriate. A radiograph with numerous shades of gray is known as a poor contrast or long gray scale radiograph.

In dental radiography, the quality of the x-ray beam is managed by _____.

Correct! Wrong!

The beam quality is controlled by the kilovoltage. The kVp governs the speed of electrons moving from the cathode to the anode and influences the x-ray beam's penetrating capabilities.

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