NASA NTAC (via Google results only), 2026-10-04

Query: "nuclear thermionic avalanche cell" NASA Choi results. Pages not opened (time); snippets [web]: - S. H. Choi, "A Portable High-Density Power Technology for Space ..." AIAA 2022 (doi 10.2514/6.2022-1911): NTAC combined with metallic-junction thermoelectric generator. - NASA TM-20220019348 (copy on Scribd) describes NTAC as a "newly invented nuclear battery" with high power density. - NTRS PDF "NTAC augmented nuclear and advanced ..." (Choi 2022). - D. M. Bushnell, "Frontiers of Space Power and Energy" (2021; copy on lenr-canr.org): NTAC "releases a large number of intra..." [atomic inner-shell] electrons. - Purdue thesis "Feasibility and design requirements of fission powered ..." on NTAC. Relation to Perreault: NASA's NTAC patents cite US7800286 (Google Patents, cited-by list). NTAC's stated principle (radiation releases inner-shell electrons that multiply in an "avalanche" and are collected) is close in words to Perreault's "delta-ray" secondary-electron cathode and his "charge multiplication" (2014 report). Whether NTAC has measured results is not established here; next run: open NTRS TM-20220019348 and record any measured power density. Bears on: claims 1-2 (secondary-electron multiplication from radiation as a power route); priority 3.