Word: emits
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Dates: during 1980-1989
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...medicine, superconducting magnets are at the heart of magnetic resonance- imaging machines. The magnets' powerful fields first align the atoms of the body. Then a pulse of radio waves knocks them momentarily out of alignment. When the atoms return to their previous attitudes, they emit radiation that produces detailed images of the body's soft tissues. MRI machines in use today are enormous (6 ft. by 8 ft. by 10 ft.), largely because of the more than $100,000 worth of bulky insulation required to preserve the liquid helium coolant, which costs an additional $30,000 annually. The improved economics...
With that I lowered myself to the ground and crawled chest to earth between the rows of strawberries, trying not to emit the sound that would send the fanged canines to do me in. I was too scared to visualize the surreal implications of my plight. Each foot was emotionally exhausting, each moment a frame from a real-life thriller. And all I wanted was fantasy: the mundane reality waiting at Cinderella's Castle...
When a nuclear reactor is running, its heat comes from the fissioning, or splitting, of the nuclei of uranium or plutonium atoms. These nuclei break apart when bombarded by neutrons, uncharged subatomic particles that are initially provided by a reactor ignition device. The shattered nuclei release energy and emit more neutrons. When uranium atoms are packed closely together, however, as they are in power-plant fuel rods, the neutrons emitted by the splitting nuclei break up other nearby nuclei. Each shattered nucleus contributes more neutrons and heat to what has now become a chain reaction, and the heat is used...
...Kitt Peak telescope had been aimed at what appeared to be two quasars, mysterious, intensely bright bodies so far away that the light they emit travels for billions of years before reaching the earth. Gathered by the telescope's parabolic mirror, the light from each of the quasars was converted into a spectrum, from which a quasar's characteristics and even its distance can be determined. Most scientists believe that each of the some 3,000 known quasars, and thus the spectrum of each, is unique. Says Charles Lawrence, a Caltech astronomer and a co-author of the Nature paper...
...most widely used new urine test, known as EMIT (for Enzyme Multiplied Immunoassay Test), is believed to be 97% accurate in the best of circumstances. But since laboratory workers often mishandle or accidentally contaminate the samples during analysis, the rate of accuracy may be considerably less. Because of such doubts, few companies fire employees or refuse to hire applicants on the basis of only one test. If the first test indicates drug use, employers generally try to confirm that result with a second urinalysis using a different laboratory technique...