Body burden is the amount of a harmful substancethat is permanently present in a person's body. It is usually expressed in massunits, such as grams and milligrams. The substance may be radioactiveor it might be chemically toxic. Many harmful substances can be eliminated naturally by the human body, but some are removed very slowly or not at all. Water soluble molecules are usually easy to remove. Non-polarmolecules, on the other hand, are lipophilicand tend to accumulate in fat tissue, which is also non-polar. Large fragments, such as shrapnel, are also difficult for the body to remove.
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It uses material from the http://en.wikipedia.org/wiki/Body+burden Wikipedia article Body burden.