How many half-value layers must be added to the primary beam to reduce its intensity to less than 20 percent of its original value?
A)1
B)2
C)3
D)4

Name: How many half-value layers must be added to the primary beam to reduce its intensity to less than 20 percent of its original value? A)1 B)2 C)3 D)4
Brand: Quizplus
Rating: 4.9 (37 reviews)

Question

Quizplus · Accepted Answer

Each half-value layer reduces the intensity of the beam to 50% of its previous value. After 3 half-value layers, the intensity will be reduced to 12.5% (0.5^3), which is less than 20%.

How Many Half-Value Layers Must Be Added to the Primary