DCF derivation help

Submitted by Anonymous on Tue, 2011-04-05 19:45

How do you get a DCF for iodine-131 in water of 1.851 * 10^-8 Sv/Bq.

When I try to do it it is 20 times bigger.

I used 190 keV for the mean energy of the beta particles is that correct.

If the decay happened in the thyroid I assumed that all of this energy would be absorbed locally.

Then I used the physiological parameters from the ICRP to work out the dose to the thyroid but it came out wrong.

Does your DCF apply to the thyroid or something else.

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Oh, I forgot to multiply by

Submitted by Anonymous (not verified) on Wed, 2011-04-06 16:00.

Oh, I forgot to multiply by a weighting factor of 0.05 for the thyroid. But I just realized that the electrons make X-rays. Can you ignore that.

Yes, I was about to ask if

Submitted by bandstra on Wed, 2011-04-06 16:03.

Yes, I was about to ask if you included that. We're using total effective dose equivalent (TEDE) in our calculations, so that factor of 0.05 is included.

Mark [BRAWM Team Member]

bump

Submitted by Anonymous (not verified) on Wed, 2011-04-06 15:04.

bump