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- W2040579377 abstract "This report, the fifty-third in a series of quarterly progress reports issued by the Research Laboratory of Electronics, contains a review of the research activities of the Laboratory for the three-month period cnding February 28, 1959. Progress is indicated in the broad fields of physical electronics, microwave gascous discharges, plasma dynamics, solid-state physics, thermoelectric processes and materials, microwave spectroscopy, nuclear magnctic resonance and hyperfine structure, microwave electronics, atomic beams, physical acoustics, and communications. (For preceding period see NP-7310.) (W.D.M.) The characteristics and properties of some recently developed radioactive self- luminous sources of light excited by the radioactive isotope krypton-85 are described. Of particular interest are the railway switch light, the hand lanterns, and flashlights. These are simple, rugged, long-life sources which do not depend upon complicated sources of power that may fail at critical times. The ability of the eye when fully dark adapted to read or work in a dark room with these sources of light has been determineds also, the distances that the sources are visible in the dark, the limit of visibility of the brightest being about 2500 feet. Radioactive hazards are discussed and shown to be negligible. (auth)" @default.
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- W2040579377 date "1959-04-15" @default.
- W2040579377 modified "2023-09-26" @default.
- W2040579377 title "QUARTERLY PROGRESS REPORT NO. 53" @default.
- W2040579377 hasPublicationYear "1959" @default.
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