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Keywords: Iridium clad GPHS pellet.jpg en Pu-238 fuel pellet in its protective iridium metal cladding as used in the General Purpose Heat Source GPHS The photograph shows the equatorial tungsten arc weld and the iridium frit-vent at the pole which releases helium from the alpha decay of plutonium 2012-02-26 http //solarsystem nasa gov/rps/types cfm U S Federal Government PD-USGov Uploaded with UploadWizard General Purpose Heat Source Plutonium |