| 释义 |
penetrameter Radiography.|pɛnɪˈtræmɪtə(r)|
Formerly also penetrometer.
[f. penetra-tion + -meter.]
An instrument for determining the wavelength, intensity, or total received dose of X-rays by measuring photographically their transmission through layers of metal of known thickness.
1907M. K. Kassabian Röntgen Rays & Electro-Therapeutics iii. iv. 431 (heading) Skiameters and penetrometers. 1912J. M. Martin Pract. Electro-Therapeutics xiv. 242 Holzknecht's chromoradiometer, Walter's or Benoist's skiameter or penetrameter will be of service in determining the amount of radiance given off from the tube. 1923Glazebrook Dict. Appl. Physics IV. 607/2 Among medical men Benoist's radiochromometer or penetrometer enjoys extensive use as a measurer of hardness. 1950Engineering 7 Apr. 373/2 A penetrameter in steps of 0·010 in., with holes in each step, to calibrate the X-ray film. 1966McGraw-Hill Encycl. Sci. & Technol. XI. 304b/2 When the smallest hole in this penetrameter can be seen in the radiograph, the penetrameter sensitivity is 2%. 1975Physics Bull. Feb. 80/2 (Advt.), This issue also reports on..theoretical aspects of measuring kilovoltage by penetrameter. |