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The purification age of nuclear materials is one of the key parameters for deducing their processing history. New Brunswick Laboratory (NBL), in collaboration with partner organizations (DHS, FBI, NIST, DOD, and DOE National Laboratories) is developing certified and/or working reference materials with specific application to radiochronometry as applied to nuclear forensics. Preparations are underway to produce a series of such reference materials and working standards over the next few years. One of the first materials to be certified will a U-Th radiochronometric reference material Uranium base materials of known age have been identified and will be certified for purification age. The first series of materials to be certified will be used for the 234U/230Th parent-daughter chronometer. NBL is currently investigating possibility of certifying material for the 235U/231Pa radiometric chain, the special case of 232U/228Th, and other approaches to measure the age of nuclear materials from the last isolation of uranium. [ABSTRACT FROM AUTHOR]