ASCP Phlebotomy Technician Certification 2025 – 400 Free Practice Questions to Pass the Exam

The major principles for self-protection from radiation exposure are best captured by the concepts of time, distance, and shielding.

Time refers to minimizing the amount of time spent near a radiation source. The less time one spends in proximity to radiation, the lower the dose received. This principle is based on the understanding that exposure to radiation accumulates over time, so reducing exposure duration is a key strategy for safety.

Distance is the principle that increasing the distance from a radiation source significantly reduces exposure. Radiation intensity diminishes with distance, following the inverse square law, which states that doubling the distance from a source results in a fourfold decrease in exposure. By maintaining a greater distance, phlebotomists and other healthcare professionals can effectively lower their risk.

Shielding involves the use of materials that can block or absorb radiation. Common shielding materials include lead aprons, glass, and concrete, which are effective at reducing radiation exposure when one is in proximity to a source. Using appropriate shielding helps to protect individuals from harmful radiation while performing necessary duties.

Together, these three principles—time, distance, and shielding—work synergistically to minimize radiation exposure and enhance safety.