American Registry of Radiologic Technologists (ARRT) Practice Exam

Question: 1 / 400

Variations in the intensity of an x-ray beam as it travels through space can be attributed to its:

Convergence

Attenuation

Divergence

The most accurate term to describe the variations in the intensity of an x-ray beam as it travels through space is attenuation. As x-rays pass through matter, their intensity diminishes due to interactions with the atoms in the material, which absorb or scatter some of the energy. This process leads to a decrease in the number of photons that make it through, resulting in a variation in intensity.

Divergence refers to the spreading out of the x-ray beam as it radiates away from the source, which can indeed influence intensity but does not encapsulate the full range of interactions that occur as the beam travels through various materials. Convergence is not typically used in the context of x-ray beam behavior, and reflection pertains to the bouncing back of waves or particles, which is not relevant when discussing intensity loss as the beam travels through space.

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Reflection

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