Enter the full width at maximum and the photo peak into the calculator to determine the energy resolution.

## Energy Resolution Formula

The following formula is used to calculate an energy resolution.

ER = FWHM * 100 / PP
• Where ER is the energy resolution (%)
• FWHM is the full width half maximum
• PP is the photo peak

To calculate the energy resolution, multiply the full width half maximum value by 100, then divide by the photo peak.

## What is Energy Resolution?

Definition:

Energy resolution is a measure of the percent of energy of incoming photons on an imaging device.

## How to calculate Energy Resolution?

Example Problem:

The following example outlines how to calculate an energy resolution.

First, determine the FWHM of a specific energy. in this example, the FWH is found to be 8%.

Next, determine the photo peak. For this example, the photo peak is 140KeV.

Finally, calculate the energy resolution using the formula above:

%ER = FWHM * 100 / PP

%ER = 8 * 100 / 140

%ER = 5.714%