Uses

• Rubidium is not used much outside of research. 
• In the real world rubidium's main purpose is as a photocell component. Photocells are usually used for motion detectors, since they convert light energy to electrical energy. 
• It's also used in making special glasses. 
• Due to the Rb-87 isotope's slight radioactivity, it's also been used to locate brain tumors. 
• Rubidium is also used sometimes for vacuum and cathode-ray tubes. 
• It's also used in atomic clocks sometimes, though other elements are usually preferred. 
• It was proposed to be used in ion engines, but it was found to be a bit less effective than Caesium. 
• It's also been proposed to be used in vapor turbines and in thermoelectric generators.

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