What is the outcome of increasing the distance from the x-ray source?

• A. Increased intensity
• B. Decreased intensity
• C. No change in intensity
• D. More scattered radiation

Answer: (B)

Increasing the distance from the x-ray source results in decreased intensity of the x-ray beam that reaches the detector or the area of interest. This phenomenon can be explained by the inverse square law, which states that the intensity of radiation is inversely proportional to the square of the distance from the source.

As you move further away from the source, the same amount of x-ray photons is spread over a larger area, leading to a decrease in the number of photons per unit area, thus reducing the intensity. This decrease in intensity is crucial in radiography as it affects the quality of images, requiring adjustments in exposure factors to achieve diagnostically useful images. Understanding how distance influences intensity helps radiographers optimize techniques and ensure proper image quality while minimizing patient exposure to radiation.