DRC Radiologic Physics & Safety 3

Question 1

When the kilovoltage peak (kVp) is increased in dental X-ray equipment, the resulting radiation beam has:

Accepted Answer

Higher energy and shorter wavelength

Answer

Increasing kVp accelerates electrons to higher speeds, producing X-rays with greater energy and correspondingly shorter wavelengths.

Question 2

The inverse square law states that X-ray intensity is inversely proportional to:

Accepted Answer

The square of the distance from the source

Answer

The inverse square law states that radiation intensity decreases with the square of the distance from the source, so doubling distance reduces intensity to one-quarter.

Question 3

Which material is most commonly used as the target (anode) in dental X-ray tubes?

Accepted Answer

Tungsten

Answer

Tungsten is used as the target material because of its high atomic number, high melting point, and efficiency in X-ray production.

Question 4

Filtration in dental X-ray equipment is used primarily to:

Accepted Answer

Remove long-wavelength low-energy photons from the beam

Answer

Filtration absorbs soft, low-energy X-rays that would not contribute to the image but would increase patient skin dose.

Question 5

In radiation physics, the term 'half-value layer' (HVL) refers to:

Accepted Answer

The thickness of material that reduces beam intensity by 50%

Answer

The half-value layer is the thickness of an absorber that reduces X-ray beam intensity to half its original value.

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

(DRC) Dental Radiology Certification for Dental Hygienist Practice Test

DRC Radiologic Physics & Safety 3