Ever since Russia resumed nuclear testing, both U.S. and European airplanes, particularly high-flying jetliners, have been bringing home unwanted cargoes of radioactivity. Such hot cargo was a recognized problem in the late 19505, but during the nuclear-test moratorium that began in 1958, the radiation level of the high atmosphere gradually decreased, and most airlines stowed their Geiger counters in mothballs. Recent Soviet tests have started the trouble all over again, and this time it is expected to grow worse and last longer. Jetliners of the 19605 fly well up in the stratosphere, where...
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