A decrease in the measured HVL indicates which of the following changes to beam hardness?

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Multiple Choice

A decrease in the measured HVL indicates which of the following changes to beam hardness?

Explanation:
Half-value layer measures beam quality: a harder beam requires more material to reduce the intensity by half, so HVL increases as hardness increases. If the HVL decreases, the beam is less penetrating and its average photon energy is lower, meaning the beam has become softer. So a decrease in HVL indicates that beam hardness has decreased.

Half-value layer measures beam quality: a harder beam requires more material to reduce the intensity by half, so HVL increases as hardness increases. If the HVL decreases, the beam is less penetrating and its average photon energy is lower, meaning the beam has become softer. So a decrease in HVL indicates that beam hardness has decreased.

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