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.
com/constellations/articles/espionage-in-orbit-satellite-or-spy (2023)
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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.