Degradation of spectral resolution vs. integrated charged-particle dose. The integrated veto detector system counts between the previous and current annealing cycle are used as a measure of the charged-particle dose, as the veto detector system mainly counts charged-particle interactions, which should scale with the incident cosmic-ray flux. Data points are labelled with the sequential number of the annealing cycles. A relationship fits degradation responding to charged-particle bombardment (dashed line).