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Answer:
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 see http://www.springerlink.com/content/0301-634x/49/4/. Given the uncertainty around the collated values Yankovich et al. recommend that ratios of between 0.75 and 1.5 should not be applied and that a value of 1.0 should be assumed instead; in the tables available for these webpages values between 0.75 and 1.5 have been replaced with a value of 1.0 for ease of use.

2. Might 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).

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