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We report the first isotopic composition measurements of trinitite, nucleardetonation debris from the Trinity test, using the novel forensics technique ofdecay energy spectroscopy (DES). DES measures the unique total decay energy (Qvalue) of each alpha-decaying isotope in a small radioactive sample embedded ina microcalorimeter detector. We find that DES can measure the majoralpha-decaying isotopes in small particles of trinitite with no dissolution orchemical processing. These first measurements demonstrate the potential of DESto provide a radiometric isotopic characterization method with sensitivity andprecision to complement traditional forensics techniques.

First Measurements of Nuclear Detonation Debris with Decay Energy Spectroscopy