Word: photon
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Dates: during 1960-1969
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...ssbauer a Nobel Prize (TIME, Nov. 10), allows gamma rays from certain radioactive isotopes to be used for measurements of extreme precision. Since gamma rays are closely akin to light, Physicist Ward suggests shooting them across an intense light beam and measuring any loss of energy due to photon-photon collisions...
...find the bubbles, the company had to haul the finished rocket motor to a giant X-ray laboratory, spend two to three weeks taking pictures. Aerojet's radiation experts went to work, found they could do the job in hours by slipping in a radioactive cobalt pill, using photon-counters to measure the rate of radiation. If it was steady, no bubbles. They kept improving their photon-detection equipment, now have a device that promises X-ray pictures with %o the radiation exposure of the most modern X-ray equipment...