When the distance from the x-ray source decreases, what happens to the beam intensity?

When the distance from the x-ray source decreases, the beam intensity increases due to the inverse square law of radiation. This law states that the intensity of radiation is inversely proportional to the square of the distance from the source. As the distance between the x-ray source and the target decreases, the area over which the x-ray beam spreads becomes smaller, resulting in higher intensity at a shorter distance. This principle is foundational in radiography, as it emphasizes the importance of distance in radiation safety and image quality.

The other choices suggest that intensity either decreases, remains the same, or varies, which does not align with the established inverse square relationship that governs radiation behavior. Understanding this concept is critical for radiographers to optimize exposure settings and ensure the safety of both patients and staff.