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RTBC X-ray Production And Safety Practice Test

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Which of the following beam energies requires the thickest HVL?
Correct Answer:
110 Kilovoltage peak (kVp)
Explanation:
High-energy beams are more penetrating, so it takes more material to cut their intensity in half. The half-value layer (HVL) measures this thickness needed to reduce the beam to 50% of its original value, and it increases as beam energy increases. Among the options, 110 kVp is the highest energy, so it requires the thickest HVL in the same material. The lower energies (60, 80, and 100 kVp) are more easily attenuated and thus need thinner HVLs. In short, increasing kVp means a thicker HVL is required.

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