Time evolution of background rates for lines from radioactive species. Top: 60Co activation, leading to gradual build-up due to the radioactive lifetime of 7.6 years. Bottom: 48V activation, with a decay time of 16 days. Exponential decay can be seen after an activation event (insert) such as a particle storm following deformations of the Earth’s magnetosphere from solar activity; but the shorter decay timeavoids long-term build-up such as seen in 60Co.
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