What are the three critical factors related to radiation exposure?

The correct answer identifies the three critical factors related to radiation exposure as distance, time, and shielding.

Distance is vital because increasing the space between a radiation source and a person decreases exposure significantly. The principle of inverse square law applies here, indicating that as distance from the radiation source increases, the intensity of radiation exposure decreases exponentially.

Time is crucial since the longer an individual is exposed to a radiation source, the higher the cumulative dose they receive. Thus, minimizing the time spent near the source is an effective way to reduce exposure.

Shielding refers to the barriers that absorb or deflect radiation. The use of materials such as lead, concrete, or other specialized substances can effectively reduce the intensity of radiation reaching an individual, providing significant protection depending on the type and energy of the radiation.

While other options may mention relevant concepts, they do not encompass the fundamental factors in radiation safety as comprehensively as this option does.