Word: tracer
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...elements can also be made radioactive, but C14 is the most useful for cancer research because 1) it remains radioactive for thousands of years, can be recovered and used again, 2) carbon is the key element in all body chemistry. Barnard's researchers will use it as a tracer (it signals its presence by shooting off radiation) to study the metabolism of cancerous cells which must be understood before the disease can be controlled, prevented or cured...
When the first news came to the fighting fronts, G.I.s yelled wildly, pounded backs, fired guns, drank hoarded whiskey. On Okinawa the night was lighted by millions of tracer bullets as men fired rifles, machine guns, antiaircraft guns. Green and yellow flares glared in the darkness. Ships offshore, fearing a Kamikaze attack, laid down a smoke screen, opened up with antiaircraft guns. Veterans had seen nothing like it during the whole battle for the islands. The celebration had tragic consequences : six men were killed, 30 wounded...
Then the night bombers struck. Antiaircraft guns filled the sky with arching tracer fire as the planes came in to hit the U.S.-held Yonton airstrip. Some of the bombs caused damage; one hit a hospital, killing twelve people...
...antiaircraft fire, 20-and 40-mm., seemed a solid flame of tracer shells, converging on him from a cone formed by a hundred ships. When he was about half a mile away he caught fire, started to roll over. What looked like an engine or a large piece of engine flew out and ricocheted along the water. The plane hit the water. Chunks of plane sailed past our boat. A stream of flame shot past a hospital ship near by. Then the peril set in. Our own antiaircraft fragments started splashing around. I wished fervently that I had worn...
...these computations must be made in two to seven seconds. Even with the help of tracer bullets, a trained free-hand gunner gets a very low percentage of hits...