Magnetic properties of iron crystals: Walther Gerlach. (Zeit. f. Plays., 39, P. 327.)
✍ Scribed by G.F.S.
- Book ID
- 104127077
- Publisher
- Elsevier Science
- Year
- 1927
- Tongue
- English
- Weight
- 67 KB
- Volume
- 203
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
39
x Io ~ ergs. The radiated coil subtended .027 unit of solid angle or 1/466 of the entire sphere. In studying the efficiency of the tube at different voltages, the current was varied so as to maintain the output as given above approximately constant for all voltages. The X-radiation received by the measuring coil was 1/233 of the entire amount emitted through the hemisphere about the target. This divided by the input gives the radiating efficiency of the tube, no account being taken of the energy sent from the surface of the target into its own interior and there absorbed.
When the voltage was 3o,ooo the efficiency was .ooo25. This rises to .ooi92 when the voltage becomes IOO,OOO. When efficiency is plotted against the squares of the voltages, the resulting curve consists of two straight lines joined at (x),ooo volts. Very roughly it may be said that the efficiency is proportional to the square of the impressed voltage. It is known that the efficiency depends to some extent upon size and arrangement of the target and of the tube itself. The state of the surface of the target also is a factor. There therefore remains much room for further investigations of efficiency in the ease of the X-ray tube.
G.F.S.