A related diagnostic is the change in the ratio of plutonium isotopes as a result of the explosion. This ratio depends on the number of fission, capture, and (n, 2n) reactions that take place. It informs inferences of efficiency (mass fission/total mass) and boost performance.
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"Appendix A – Underground Nuclear Test Diagnostics."
Review of the DOE National Security Labs' Use of Archival Nuclear Test Data: Letter Report (QMU Phase II).
Washington, DC: The National Academies Press, 2009.
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