| Popis: |
The radiation induced shifts of frequency observed under fragmented and continuous exposures at low dose rate (Low Earth's Orbit-LEO-and Geostationary Earth's Orbit-GEO-simulations) on Ultra Stable Oscillators equipped with electrodeless (BVA) and self sustained (QAS) crystals, with swept and unswept quartz are presented. The drifts appear as the sum of two components; the first saturating and annealing rapidly, the second, seen during continuous exposure, probably varies during the few months after the end of the irradiation. > |
