| 释义 |
radiometric, a.|reɪdɪəʊˈmɛtrɪk|
[f. radio- 2 + -metric.]
1. Of or pertaining to the radiometer (sense 2) or its use.
1877Chem. News 12 Jan. 21/2 (heading) New radiometric experiments. 1883Athenæum 10 Feb. 189/2 The effects of all the different parts of the radiometric apparatus in influencing radiometer motion. 1904Electrician 28 Oct. 58/2 Prof. Nichols also suggests a new radiometric receiver, whose action is based on the electrostatic and electrodynamic action between equal resonators. 1927H. N. Russell et al. Astron. II. xxi. 735 With a suitable thermoelectric device the heat radiation of the stars may now easily be measured and the results expressed as ‘radiometric magnitudes’. 1964Yearbk. Astron. 1965 111 For Mars, information about ground temperatures may be obtained from radiometric observations, and the amount of insolation is easily calculable. 1977A. Hallam Planet Earth 111 Magnetic, electromagnetic and radiometric techniques are commonly adapted to airborne surveys.
2. Of, pertaining to, or involving the measurement of radioactivity or ionizing radiation; radiometric dating, isotopic dating.
1906Sci. Abstr. A. IX. 50 Sabouraud and Noiré..point out that their radiometric value is not in any way diminished. 1938R. W. Lawson tr. Hevesy & Paneth's Man. Radioactivity (ed. 2) xviii. 169 This method of ‘Radiometric Microanalysis’ has rendered it possible..to carry out a determination of the nitrogen content of organic substances to the order of magnitude of some ten-thousandths of a milligram. 1951Engineering 2 Feb. 148/1 Radiometric methods are frequently used in the investigation of uranium-bearing minerals. 1962F. I. Ordway et al. Basic Astronautics v. 191 Gamma ray scintillation spectrometers make radiometric assays. 1968Sci. Jrnl. Oct. 122/3 Geologic Time is concerned with how the present knowledge of the Earth's history has been built up;..palaeomagnetism and continental drift; biostratigraphy and radiometric dating. 1969Beaver Summer 34/2 The coal deposits there are overlaid by volcanic ash determined as 72–73 million years old by radiometric dating processes. 1972Science 2 June 977/1 Radiometric ages obtained for the Apollo 14 examples..cluster around a value of 3·9 × 109 years.
Hence (in either sense) radioˈmetrically adv., by a radiometric method.
1920Jrnl. Franklin Inst. CLXXXIX. 27 The energy was determined in the spectrophotometric laboratory, visually on a König-Martens Spectrophotometer, by a substitution method of comparison with a radiometrically calibrated Mazda lamp. 1962F. P. W. Winteringham in Radioisotopes & Radiation in Entomol. (Internat. Atomic Energy Agency) 117 P32 and S35 are readily differentiated radiometrically. 1968Palaeogeogr., Palaeoclimatol., Palaeoecol. V. 69 The paleobotanical event has been radiometrically dated at about 12,000,000 years B.P. 1972Science 2 June 978/1 The times of formation of lunar craters have been determined radiometrically. 1973Physics Bull. Apr. 239/3 The centre is equipped with radiometrically and photometrically calibrated sources and a range of calibrated detectors for continuous wave and pulsed radiation. |