The fuel inventory quoted in [27Jump To The Next Citation Point] is 5.8 kg. This much 238Pu would produce significantly more heat at the rate of 0.57 W/g than the known thermal power of the Pioneer RTGs. Likely, 5.8 kg was the total mass of the plutonium-molybdenum cermet pucks on board, which contained approximately 4.6 kg plutonium metal.