How did the engineering complexity and resource demands of the SNAP-10A fission system compare to the RTG used on Transit 4A?
The engineering complexity and shielding required for the fission system far outstripped those of the RTG
The text emphasizes that the two technologies represented different levels of engineering achievement and risk. The RTG deployed on Transit 4A utilized a passive system based on isotopic decay, requiring minimal active control and therefore less complex engineering and shielding requirements. In contrast, the SNAP-10A system involved a self-sustaining nuclear fission reactor, which necessitates managing a controlled chain reaction. This inherent difference meant that the complexity, safety features, and required shielding for the 1965 fission flight were substantially greater than what was needed for the 1961 radioisotope deployment, making the reactor launch a far greater technological leap.
