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Free Webster Calculation Resource

Webster Calculations Guide

Written by

Chris Passmore, CHP

Understand Webster calculations, why they matter, and how to apply them clearly in your dosimetry program with this comprehensive guide.

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Frequently Asked Questions

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Find answers to common questions about Webster calculations.

What are Webster calculations in radiation safety?

Webster calculations are formulas that adjust dosimeter readings to estimate effective dose equivalent (EDE) when workers wear lead aprons. There are two Webster calculations:

  • The original (two-dosimeter) Webster: EDE = [1.5 × under-apron Hp(10)] + [0.04 × collar Hp(10)]
  • The modified (one-dosimeter) Webster: EDE = [0.3 × collar Hp(10)]

Aprons create non-uniform radiation fields. Webster formulas balance shielded and unshielded measurements to give a realistic whole body dose for accurate dose reports.

Radiation Detection Company uses Webster 1 and Webster 2 to describe the original Webster and modified Webster calculations, respectively.

  • Webster 2 uses two dosimeters – one under the apron at the torso or waist and one at the collar. EDE = [1.5 × under-apron Hp(10)] + [0.04 × collar Hp(10)].
  • Webster 1 usually refers to the collar-only (modified method). EDE = [0.3 × collar Hp(10)]

Yes, regulatory guidelines acknowledge the use of Webster calculations and avoid shorthand terms – compliance depends on clear documentation of the method used. However, you should consult your state’s regulations to ensure compliance.

No. They supplement dosimeter readings by correcting for shielding effects. The raw data still comes from dosimeters; regulatory agencies require consistent dosimeter use.

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