A shielding device with thickness equal to 3 HVLs reduces radiation to what fraction of the original?

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Multiple Choice

A shielding device with thickness equal to 3 HVLs reduces radiation to what fraction of the original?

Explanation:
Each HVL halves the radiation that gets through. After three HVLs, the intensity is halved three times: 100% → 50% → 25% → 12.5%. So the shielding leaves 12.5% of the original radiation (1/8 of it).

Each HVL halves the radiation that gets through. After three HVLs, the intensity is halved three times: 100% → 50% → 25% → 12.5%. So the shielding leaves 12.5% of the original radiation (1/8 of it).

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