I.-Distributors, suppliers and manufacturers of construction products containing natural materials or industrial residues mentioned in article R. 1333-40 indicate an activity concentration index (I) in the documents providing the characteristics of these products from 1st July 2020.
II.-The activity concentration index (I) is calculated by applying the following formula:
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Where CRa226, CTh232 and CK40 are the activity concentrations in Bq. kg-1 of the corresponding radionuclides in the building material.