Re: Webster EDE calculation

[Ken Douglass <kdouglas@wvuhsc1.hsc.wvu.edu>]

Sandy, et al.:

Using a weighted average of dosimeter readings makes sense because it
explicitly shows the protective effect of wearing the apron. The
important question is how to assign the weights. In particular, the 0.04
factor for the collar dosimeter seems too small to me.

Can you give a reference for the Webster formula and briefly describe
how it was derived? Why do you use it rather than some other formula?

I personally like the approach taken by Berger, et al., (Health Physics,
69:570-576; 1995). They attempted to assign the EDE weighting factors to
the different dosimeters and get a weight of 0.10 for the head/neck
area. This makes a big difference in the calculated EDE since, in my
limited experience, the collar reading is considerably higher than the
waist reading.

Thanks to RadSafe for another useful discussion.

Ken

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