DANB Radiation Health and Safety (RHS) Exam 2025 – 400 Free Practice Questions to Pass the Test

The principle that should be applied when using any radiographic equipment is "time, distance, and shielding." This concept is crucial in radiation safety practices. The idea is to reduce exposure to radiation by managing these three variables effectively.

Minimizing exposure time directly reduces the length of time an individual is exposed to radiation, which significantly lowers the overall dose received. Utilizing distance involves keeping as much distance as possible between the radiation source and the person working with or near the equipment; in general, the further away you are from the source, the less radiation you will be exposed to. Shielding is the use of barriers, such as lead walls or aprons, to absorb radiation and protect individuals from exposure.

Together, these strategies are foundational to minimizing radiation risk. They embody the principle of ALARA (As Low As Reasonably Achievable), which is integral to radiation safety protocols. By applying the principle of time, distance, and shielding, individuals working with radiographic equipment can help ensure safe practices and protect themselves and others from unnecessary radiation exposure.