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3) If CR values are in the range from 61 to 493 for one fish for Ra, what
should I do? Should I use average or maximum? N of samples is 15.

Answer:

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1. Yes Yankovich et al. 2010 presents the most up to date compilation of tissue:wholebody activity concentration ratios you can use these to convert tissue specific activity concentrations to wholebody values. Note the Yankovich et al. paper has been published today (26/10/10) in an issue of Radiation and Environmental Biopyhsics seehttp://www.springerlink.com/content/0301-634x/49/4/^{Image Removed}.

2. May depend upon the radionuclide: you may want to convert both bone and muscle data and take average for radionuclides which do not accumulate in either of these tissues; for other radionuclides which accumulate in one of the two tissues you may have more confidence in the data for the accumulating tissue (e.g. Sr, Pu, Am and Ra accumulate in bone and have comparatively low transfers to muscle).

3. Depends upon the purpose of your assessment. If conservative then assume the maximum value, if more realistic then use an average value. Remember that in both RESRAD BIOTA and the ERICA Tool you can use a pdf to conduct a probabilistic assessment if appropriate for your purposes.
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Answered by Nick Beresford 26/10/2010

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