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One material attribute for nuclear forensics is material age. 241 Pu is almost always present in uranium- and plutonium-based nuclear weapons, which pose the greatest threat to our security. The in-growth of 241 Am due to the decay of 241 Pu provides an excellent chronometer of the material. A well-characterized 241 Pu/ 241 Am standard is needed to validate measurement capability, as a basis for between-laboratory comparability, and as material for verifying laboratory performance. This effort verifies the certification of a 38 year old 241 Pu Standard Reference Material (SRM4340) through alpha-gamma anticoincidence counting, and also establishes the separation date to two weeks of the documented date.

How old is it?—241Pu/241Am nuclear forensic chronology reference materials