[rtkwe]

The timing of the explosives around the core is extremely important to actually getting a nuclear detonation instead of just a dirty bomb so the precise timing and triggering of the detonators is a very critical part of the bomb. They're not just simple fuses you can light and run away.

[LargoLasskhyfv]

Then use rad-hard arduino/esp-32/cortex-m0/RittzkenfaiiV/whatever equivalents running NTP / Precision Time Protocol(PTP) in a cluster, with the elements embedded in the individual explosives. Maybe read about https://duckduckgo.com/?q=+fourth+generation+nuclear+weapons and how that could be applied to the material at hand, Ka-Boom!