Practice Quiz

ADA NBDHE Dental Hygienist

Category - Provision of Clinical Dental Hygiene Services

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A clinician standing three feet from an x-ray source receives 4 rad of radiation.
According to the Inverse Square Law, how many rad of radiation would the clinician receive from a distance of six feet?(1 fish 5 fish, 1 rad 5 rad) both singular and plural.
  1. 4 Rad
  2. 2 Rad
  3. 1 Rad
  4. 1/2 Rad
Explanation
Answer: C - A clinician would receive 1 rad of radiation from a distance of six feet.
Radiation intensity is inversely proportional to the square of the distance from the source of the x-rays. The original intensity of 4 rad divided by the square of six (distance in feet) is proportional to 1 rad over the original distance of three (feet) squared.
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