Nature of Gamma - ray Bursts Gamma Ray Bursts (GRBs) were discovered in 1967 by satellites designed to monitor compliance with the atmospheric nuclear test ban treaty. (public.nrao.edu)
This (link) is a classic tracer measurement, where the tracer material (carbon - 14) was in equilibrium with all the sources / sinks before the atmospheric a-bomb tests introduced an «impulse» of C - 14 that was abruptly ended with the atmospheric test ban treaty of 1963. (joannenova.com.au)
We have a small arsenal and we support important initiatives like the comprehensive test ban treaty and the fissile material cut - off treaty. (politics.co.uk)