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What is the formula for HVL (half-value layer)?

What is the formula for HVL (half-value layer)?
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What is the formula for HVL (half-value layer)?

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User Ryan Rahlf
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The half-value layer formula is HVL = = 0.693/μ.
Multiply your answer by 10 to express your HVL in millimeters. This is necessary because many attenuation coefficients are given with the units cm-1, and some HVLs are expressed in mm.
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User Wundwin Born
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