[Intl_DxMedPhys] Webster 1 Calculation & Protective Lead Thickness.

[David Eastman]

To Whom It May Concern,

I'm wondering if anyone would be able to share the lead, or lead equivalent, protective apron thickness as it relates to the Webster 1 (or EDE2) calculation, when one badge is worn outside the lead and at the collar.  Basically, I'm wondering what thickness of lead was used when creating the Webster 1 correction (i.e. 0.25 mm, 0.3 mm, 0.5 mm)?

I'm asking because when the Webster 1 (EDE2) correction has been applied to one's measured whole body dose (or DDE), I have thought that when a 0.5 mm lead equivalent apron was worn, a conservative dose correction was provided.

However, I've recently learned that some staff have been wearing protective lead closer to a 0.3 mm lead equivalence, and they have still had the Webster 1 correction applied to their dose report.  So, I'm wondering if the Webster 1 correction is now just more accurate, rather than conservative?  Or, has the Webster 1 correction caused the reported dosimetry results to be falsely low due to one wearing a 0.3 mm lead equivalent apron, rather than a 0.5 mm lead equivalent apron?

Thank you for your time and assistance regarding this inquiry.  Please know it is greatly appreciated.

Have a great rest of your day!


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David J. Eastman, M.E.H.S.

Medical Health Physicist &

Radiation Safety Officer



O: (218) 786-1026

C: (218) 341-0971

david at rpcphysics.com<mailto:shane at rpcphysics.com>

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