Which of the following are basic ways to lower radiation dose when working with radiography sources?

The correct approach to lowering radiation dose when working with radiography sources involves three key principles known as time, distance, and shielding.

Time refers to minimizing the exposure duration to radiation. The longer a person remains in a radiative field, the greater the dose they receive. Therefore, reducing the amount of time spent near the source directly decreases radiation exposure.

Distance plays a crucial role because radiation intensity diminishes with distance from the source. By maintaining a greater distance from the radiographic source, the dose received is significantly reduced due to the inverse square law, which states that the intensity of radiation exposure decreases proportionally to the square of the distance from the source.

Shielding involves using materials that absorb or block radiation to provide protection for individuals nearby. Common shielding materials include lead and concrete, which are effective in reducing exposure by absorbing the energy from radiation.

Though elements like ventilation and supervision are important in some contexts, they do not directly relate to the fundamental measures of reducing radiation dose in the same way that time, distance, and shielding do. Ventilation can help in dispersing airborne radioactive materials but does not mitigate direct exposure. Hence, time, distance, and shielding provide the foundational strategies for effective radiation safety in radiography.