Seller: tkingston28 (380) 100%, Location: Phoenix, Arizona, Ships to: US, Item: 133143721855 Zimmer Radon Generator from the 1940's. The Zimmer Radon Generator belongs to a category of devices called emanators. It would have been placed in water, usually 1-2 gallons, to infuse the water with radon, a radioactive gas. As a rough estimate, the Zimmer Laboratories of Los Angeles (Bendix Building) produced 5,000 to 10,000 of these devices. If true, this would be remarkable since the device contained refined radium and cost U.S. $290 in the 1940's. The marble at the top has a slight purple color as a result of its exposure to the radiation from the radium. This is a very rare piece and never comes up for auction, it measures 3.25" tall and approx 3" wide, it is very heavy for it's size. $290 today would be about $4,500 in todays money.