Half-Value Layer (HVL) Is Defined as the Thickness of a Designated

Half-value layer (HVL) is defined as the thickness of a designated absorber required to

A) decrease the intensity of the primary beam by 50% of its initial value
B) decrease the intensity of the primary beam by 25% of its initial value
C) increase the intensity of the primary beam by 50% of its initial value
D) increase the intensity of the primary beam by 25% of its initial value