Modern Analysis Tools and Techniques for RTGs

Radioisotope Thermoelectric Generators (RTGs) are sophisticated and unique power sources for deep space science missions. This chapter explores some of the modern modeling tools and analytical methods used to understand various phenomena associated with RTGs. These tools and methods predict thermoelectric couple physics, generator performance, thermal management, ionizing radiation effects, and more. One primary cause of decreasing RTG power is degradation in the thermoelectric converter. A preliminary evaluation of the effect of thermal inventory on Multi‐Mission Radioisotope Thermoelectric Generator performance can be estimated by analyzing life test data from the Engineering Unit and Qualification Unit. The radioisotope power system dose estimation tool is a software application developed with collaboration between DOE, Oak Ridge National Laboratory, Idaho National Laboratory, and National Aeronautics and Space Administration's Radioisotope Power System Program to help researchers simulate and analyze ionizing radiation produced by an Radioisotope Power Systems.