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The Energy of X-Rays
Phys. Rev. 28, 438 – Published 1 September, 1926
DOI: https://doi.org/10.1103/PhysRev.28.438
Abstract
An apparatus is described to determine the total energy of x-rays from a tube by the conversion of this energy into heat. The x-rays are absorbed in a lead coil connected with a resistance thermometer bridge, and the amount of heat developed is determined from the current that must be passed through the coil to give the same temperature rise. The energy thus found is compared with the power input to determine the efficiency of the production of x-rays.
A tungsten target tube is excited by constant potential direct current at from 30 to 100 KV and the energy per unit solid angle is found to be 39 to 305× times the power supplied. This corresponds to an approximate total output of the tube of.00025 to.00192 times the input for the same range of voltages. Plotted against the square of the voltage these values give a straight line to 69.3 KV where a change of slope occurs, probably due to the selective absorption of the target itself.
References (5)
- Weeks, Phys. Rev. 10, 564 (1917)
- Brainin, Phys. Rev. 10, 461 (1917)
- Ulrey, Phys. Rev. 11, 401 (1918)
- Weeks, loc. cit., p. 570
- Coolidge, Am. Jour. Roent. 2, 882 (1915)