Anomalous radiochemical recovery of post-detonation gold residues at the National Ignition Facility

Activated Au from a fragmented and dispersed NIF hohlraum is of interest to measure the induced 14.1-MeV 198m+gAu/196gAu isotope ratio as an assessment of shot performance. A radiochemical recovery procedure, based on Au complexation by cyanide in NaOH-NaCN solution, was developed to reclaim radiogold (*Au) residues from post-detonation graphite collector foils. The average overall radiochemical yield from grafoils in an equatorial position relative to the hohlraum was 88 %. However, the yield from the identical procedure applied to post-shot grafoils positioned axially (polar) was much decreased. The chemical dependency of explosion reaction products on collector position around an ostensibly symmetric fusion source is currently unexplained.

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