What is the intensity of an x-ray beam created with two half-value layers (HVL) of filtration if the unfiltered intensity is 120 μGy?

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Multiple Choice

What is the intensity of an x-ray beam created with two half-value layers (HVL) of filtration if the unfiltered intensity is 120 μGy?

Explanation:
Attenuation by half-value layers cuts the beam intensity in half with each HVL. Starting from 120 μGy, one HVL brings it to 60 μGy, and a second HVL halves it again to 30 μGy. So the final intensity is 30 μGy. In general, two HVLs reduce the original intensity by a factor of four (I = I0 / 2^2).

Attenuation by half-value layers cuts the beam intensity in half with each HVL. Starting from 120 μGy, one HVL brings it to 60 μGy, and a second HVL halves it again to 30 μGy. So the final intensity is 30 μGy. In general, two HVLs reduce the original intensity by a factor of four (I = I0 / 2^2).

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