Word: gamma
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...Kappa Alpha Theta, Kappa Kappa Gamma, 31 Beta Phi, Delta Gamma, Alpha Phi, Gamma* Phi Beta, Delta, Delta, Delta, Alpha Omicron Pi, Chi Omega...
Second biggest market for radium-to which advertising is now addressed-is only four or five years old. It is radiography, i.e., inspecting the insides of metals, weldings, castings, molds by taking photographs with radiation of smaller wave length than light's. The gamma rays which radium gives off can penetrate eleven inches of steel; X-rays can get through but six. (X-rays have until now dominated this field...
Long found time to mix sports and studies being active as a member of both the Varsity basketball and baseball teams. His other school activities included membership in Phi Beta Kappa, Pi Delta Epsilon, Phi Gamma Delta and the Sphinx Club, an upperclassmen's Honorary Society...
...tube as a beam of beta rays-whence the betatron's name-which are one of the three types of radiation naturally given off by radium; or 2) Directed at a metal target, battering from it X-rays which are much more penetrating than radium's gamma rays. The betatron can produce as much radiation as over 1,000 grams of radium (world's supply: 750 grams...
...vacuum tube and hits a "target,", usually a piece of tungsten. The electrons batter from the tungsten a secondary stream of chargeless particles, X-rays, whose wave lengths are thousands of times shorter than those of ultraviolet light and almost as short as those of radium's gamma rays. The shorter waves are the farther they penetrate into matter before their energy is dispersed. The stronger the voltage the shorter the resulting X-ray wave length and the greater the penetration. Thick Navy steels can be radiographed with 400,000-volt machines; but the pictures are not clear...