Enter the linear attenuation coefficient (1/cm) into the Half Value Layer Calculator. The calculator will evaluate the Half Value Layer.

## 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.

1. First, determine the linear attenuation coefficient (1/cm).
2. Next, gather the formula from above = HVL = .693/u.
3. Finally, calculate the Half Value Layer.
4. 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 = ?