Word: detectable
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...Harvard School of Public Health, Dr. Edward P. Radford Jr. and Dr. Vilma R. Hunt worked with polonium,* one of the rarest of the naturally occurring elements and until recently one of the hardest to detect. Many radioactive elements are found in tobacco leaves, as in all vegetation; they occur naturally and have nothing to do with man-made fallout, and they have been exonerated as causes of lung cancer. Polonium is different, the Harvard researchers reported in Science, because it vaporizes at a mere 500° C., far below the 800° temperature of a burning cigarette...
Firmer Figure. To detect these few hits, a stream of helium will bubble through the tank, sweeping any argon 37 and carrying it to a charcoal filter. Then a special instrument will count the argon atoms by means of their radioactivity. Their number will be in direct proportion to the total number of neutrinos emitted...
...believe that the stations will pay for themselves by serving as military patrols-watching and photographing activity behind the Iron Curtain, inspecting suspicious satellites and destroying them, if desirable. Patrols might carry nuclear weapons for use against the ground or other spacecraft. Some optimists believe that they might even detect hostile nuclear submarines below the surface of the ocean...
Everywhere archaeologists, armed with all the advantages of modern science, are extending the geography of history. Aerial cameras detect the faint outlines of long-demolished walls; delicate airborne magnetometers ferret out forgotten fortifications; measurements of minute bits of carbon establish accurate dates back beyond any written record. Mummies are submitted to autopsy for a knowledge of ancient diseases. Fossilized grains of pollen testify to the climate in which they grew. Reused writing materials, called palimpsests, are irradiated with ultraviolet light and reveal words that were erased thousands of years...
...another Japanese. Suddenly a grizzly bear materializes on the screen and just as suddenly dissolves. At one point, while the heroes grapple in a foot of snow, the sound track plays ethnic music from equatorial Africa. And all through the film, the cinemate moviegoer will be able to detect sly little mementos of D. W. Griffith, Sergei Eisenstein, Akira Kurosawa, Michelangelo Antonioni-and Ma and Pa Kettle...