Word: electronics
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...microscope, the X rays are generated by an electron beam that is focused by electronic lenses on a spot only one-100,000th of an inch in diameter, 300 times smaller than the diameter of a human hair. X rays coming from this tiny pinpoint cast shadows so sharp that they keep their definition even when thrown on a fluorescent screen or photographic film with 1,500 diameters of magnification...
...peculiar track was made by enormously powerful gamma rays that created electron-positron pairs as they streaked away from the site of the collision...
...primary cosmic rays that bombard the top of the atmosphere. Later, studying the plates in the laboratory, Dr. Schein got more and more excited as he followed a peculiar ray track through the pack. The track was a bundle of slim Vs made by pairs of negative and positive electrons and there was no trace of larger charged particles (e.g., protons) usually present. His cautious conclusion: "something" had hit the film pack with the unheard-of energy of 10 million billion electron-volts...
...headed by Professor Bruno Rossi, reported that a strange intruder from space had entered one of its cosmic-ray cloud chambers. When it first showed up, it behaved like a rather slow-moving heavy particle. Then it hit a brass plate in the apparatus and set off three powerful electron "cascades" that appeared to have been started by high-energy gamma rays...
Professor Rossi believes that the original particle may have been an antiproton that hit a normal proton in the brass plate and annihilated it. Apparently the encounter produced nothing but energy, and it produced too much (about 1.3 billion electron-volts) to be accounted for by any other process...