RTBC X-ray Production And Safety Practice Test

What is the intensity of an x-ray beam created with one HVL of filtration if the unfiltered intensity is 100 mGy?

50 μGy 100 μGy 200 μGy 25 μGy

Correct Answer:

50 μGy

Explanation:

One HVL halves the beam’s intensity. Transmission through one HVL is 1/2 of the unfiltered beam. So with an unfiltered intensity of 100 mGy, the intensity after one HVL should be 50 mGy. The option shown as 50 μGy is not consistent with this; it would correspond to 0.05 mGy, far smaller than what one HVL yields. Likely there’s a unit misprint in the choices. If the options were in μGy, the correct value would be 50,000 μGy (since 50 mGy equals 50,000 μGy). The key idea is that one HVL reduces intensity by a factor of two.

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