I was reminded by a reader that a shortage of Pu-238 exists, for those of you who are not in the know. Pu-238 is a proper radioisotope of Pu. In comparison Pu-239 is quite low in terms of activity per gram. As a possible replacement for Pu-238, Am-241 has been suggested.
For other applications other radionuclides such as Sr-90 have been used in RTGs, this is what the Soviets used for a lot of the RTGs which were used at remote lighthouses or substations in the middle of nowhere.
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