Polonium Radioactive Electrode Firestone Spark Plug
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This is a vintage Firestone Spark Plug with a Polonium "Radioactive" Electrode in its original box. First that are entirely safe since they were alpha particle emitters when made which do not penetrate the skin and the source has a half like of 138 days. About 65 years later, they no longer emit. The development to incorporate radioactive material into spark plugs seems to belong to Alfred Hubbard who received a patent for this concept in 1929. The Firestone Tire and Rubber Company was the only company to move forward to market the concept. The first commercially available "radioactive" spark plugs became available in 1940. They used Polonium-210 w trace amounts were incorporated into the electrodes that formed the spark gap of the spark plug. The polonium was added to the nickel alloy molten metal of the wires that were used to produce the electrodes. The alpha particles emitted by the decay of the polonium would expected to ionize the gas within the spark gap. It was more advertising than fact and it was marketed as producing a longer and wider spark. The November 1941 Science Digest issue reported tests that indicated 30% fewer revolutions required to start the motor as compared with regular spark plugs. According to the company's advertising, the spark plugs also resulted in a smoother motor performance, faster pick-up, quicker
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