In treating certain types of cancer by radiation, doctors implant little gold "seeds" inside the growths. The seeds are actually hollow gold beads, each containing radon gas. After two or three weeks, the radon's radioactivity is virtually gone. The harmless seeds are left in place, but a few of them may be sloughed off by the body. At Manhattan's Memorial Sloan-Kettering Cancer Center, a nurse saved the seeds sloughed off by the tumor and had the salvaged gold made into a ring for her boy friend. He developed red patches on his...
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