Reviewed By: Patrick Myers (BSME)
Enter the linear attenuation coefficient (1/cm) into the Half Value Layer Calculator. The calculator will evaluate the Half Value Layer.
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Half Value Layer Formula
The following two example problems outline the steps and information needed to calculate the Half Value Layer.
HVL = .693/u
Variables:
- HVL is the Half Value Layer (cm)
- u is the linear attenuation coefficient (1/cm)
To calculate the half-value layer, divide .693 by the linear attenuation coefficient.
How to Calculate Half Value Layer?
The following steps outline how to calculate the Half Value Layer.
- First, determine the linear attenuation coefficient (1/cm).
- Next, gather the formula from above = HVL = .693/u.
- Finally, calculate the Half Value Layer.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
linear attenuation coefficient (1/cm) = .707
HVL = .693/u = ?
