The generator contains the strontium-90 radioisotope, with a heating power of 250W and 1,480 TBq of radioactivity – equivalent to some  of Sr-90. Mass-scale production of RTGs in the Soviet Union was the responsibility of a plant called Baltiyets, in Narva, Estonia.
The generator contains strontium-90 radioisotope with a power output of 250W and 1,480 TBq of radioactivity, equivalent to some Sr-90. The Soviet Union's Baltiyets plant in Narva, Estonia was responsible for mass production of Radioisotope Thermoelectric Generators (RTGs).