What are EDE, or Webster Calculations? - Radiation Detection Company
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What are EDE, or Webster Calculations?

Jessica Smith | June 8, 2021

Effective Dose Equivalent (EDE), or Webster calculations, refer to a calculation used to reflect the dose of a radiation worker wearing a lead apron.

EDE 1, or Webster 1, would be calculated using a single dosimeter worn on the collar outside of the lead apron. The EDE is equal to 0.30 of the collar badge deep dose to reflect the shielding of the lead apron. The eye and shallow dose will remain the same as the calculated collar badge due to the lead apron not providing shielding for these areas.

EDE 2, or Webster 2, would be calculated using two dosimeters. One dosimeter is worn on the collar outside of the lead apron, the other is worn on the waste under the lead apron. The shallow and eye doses are calculated using the shallow dose delivered to the collar badge. The deep dose is equal to 1.5 the deep dose of the waste badge, plus .04 of the collar badge deep dose.

It is important to note that not all states allow EDE calculations.  Before requesting this for your dose report, you must be sure your state will allow it.

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