A 9U CubeSat detector can identify a thermonuclear weapon on a satellite from 4 km away by observing spallation neutrons induced by GeV protons in roughly one week.
https://www.newsweek.com/ us-china-news-military-satellites-close-encounter-orbit-2067071 (2025)
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Verification of the Outer Space Treaty with Cosmic Protons
A 9U CubeSat detector can identify a thermonuclear weapon on a satellite from 4 km away by observing spallation neutrons induced by GeV protons in roughly one week.