Table IL Trends in RTG Technology Parameter SNAP-3B SNAP-9A SNAP-27 TRANSIT-RTG SNAP-19 MHW-RTG GPHS-RTG Mission TRANSIT 4 TRANSIT 5BN Apollo Triad Pioneer Voyager Galileo/Ulysses BOM Power per RTG (We) 2.7 26.8 73.4 35.6 40.3 158.0 300“ Thermoelectric material PbTe 2N/2P PbTe 2N/2P PbTe 3N/3P PbTe 2N/3P PbTe 2N/TAGS-85 SiGe SiGe Pu-238 Fuel form Metal Metal Oxide (microspheres) PMC* PMC* Pressed oxide Pressed oxide Conversion efficiency (%) 5.1 5.1 5.0 4.2 6.2 6.6 6.8 Specific power (We/kg) 1.29 2.2 2.3“ 2.6 3.0 4.2 5.3 “Approximate power for originally planned 1986 launches—see [21]. *Plutonia Molybdenum Cermet. “The SNAP-27 specific power is shown with the fuel-cask mass included.
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