Which of the following statements about radiation exposure is true?

The principle of "As Low As Reasonably Achievable" (ALARA) is a fundamental concept in radiation safety and protection. This principle emphasizes the importance of minimizing radiation exposure to patients, healthcare workers, and the public while ensuring that the necessary diagnostic or therapeutic procedures remain effective. By applying ALARA, radiologic technologists and other healthcare professionals strive to keep radiation doses as low as possible through various methods, such as using shielding, optimizing imaging techniques, and ensuring proper equipment calibration.

The other statements are not accurate representations of radiation exposure. Radiation exposure can indeed be measured using various devices such as dosimeters and ionization chambers. Not all radiation exposure is harmful; for instance, low doses of radiation can be harmless in many situations, and the context often determines the risk. Additionally, radiation exposure occurs in a variety of settings beyond just imaging, such as natural background radiation and certain occupational exposures. Thus, focusing on the implementation of ALARA is crucial for enhancing safety in environments where radiation is present.