If the specific tissue dose is multiplied by the appropriate tissue weighting factor to obtain the equivalent whole-body dose, then dividing the equivalent whole-body dose by the tissue weighting factor should yield the specific tissue dose.
In this system, appropriate tissue weighting factors are used to account for differences in tissue-specific risks when the body is irradiated nonuniformly.
First, there is substantial statistical uncertainty in the values of tissue weighting factors. The ICRP recognized these uncertainties but, nevertheless, assigned single values to these factors to facilitate dose calculations.
Further, application of tissue weighting factors is problematic because of the large uncertainties in the values.
Incorporating weighting factors into dose limits eliminates uncertainties inherent in using tissue weighting factors in the risk-based system.
Since radiation and tissue weighting factors are dimensionless, there is no need to use other quantities to describe what is simply a weighted absorbed dose.