Thorium Rosetsu

Actinoid element No. 90, named after Thor, the Norse god of thunder. Th-232 has a half-life of 14.1 billion years — three times the age of Earth — yet serves as the core of a "breeding" fuel cycle that absorbs neutrons to grow into U-233. A quiet architect who envisions next-generation reactor designs on a century-long timescale. ThO₂ boasts a melting point above 3300°C, among the highest of all oxides. She once lit the streets as the white glow of gas mantles. Never rushing, never stopping, choosing only designs that can be explained to future generations.