What safety principle states radiation exposure should be kept to minimum or as low as reasonably achievable?

• A. ALARA
• B. Absorption
• C. Analog Data
• D. Artifact

Answer: (A)

Reducing radiation exposure to the lowest level possible while still obtaining a diagnostic image is the guiding safety principle in dental imaging. This principle is ALARA, which stands for As Low As Reasonably Achievable. It means every step should be taken to minimize dose without compromising the needed diagnostic information. In practice, this includes only taking radiographs when there is a clear patient need, using techniques and equipment that minimize exposure (like proper beam collimation, shielding, and choosing the fastest suitable film or sensor), and ensuring the image quality is achieved correctly the first time to avoid repeats. Digital options and optimized exposure settings can further reduce dose when appropriate. The other terms don’t describe this safety approach: absorption refers to how X-ray energy interacts with tissues, analog data is unrelated to dose concerns, and artifact is an image distortion, not a dose-management concept. So the principle guiding dose reduction in dental radiology is ALARA.