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What (who) is radiometric$66507$ - definition
![[[Apatite]] crystals are widely used in fission track dating.](https://commons.wikimedia.org/wiki/Special:FilePath/Apatite Canada.jpg?width=200 "[[Apatite]] crystals are widely used in fission track dating.")
![Lu-Hf]] isochrons plotted of meteorite samples. The age is calculated from the slope of the isochron (line) and the original composition from the intercept of the isochron with the y-axis.](https://commons.wikimedia.org/wiki/Special:FilePath/Figure 2 High res Debaille et al (2017) The role of phosphates for the Lu–Hf chronology of meteorites.gif?width=200 "Lu-Hf]] isochrons plotted of meteorite samples. The age is calculated from the slope of the isochron (line) and the original composition from the intercept of the isochron with the y-axis.")
![[[Thermal ionization mass spectrometer]] used in radiometric dating.](https://commons.wikimedia.org/wiki/Special:FilePath/Thermal ionization mass spectrometer.jpg?width=200 "[[Thermal ionization mass spectrometer]] used in radiometric dating.")
![β<sup>−</sup> decay]]. The final decay product, lead-208 (<sup>208</sup>Pb), is stable and can no longer undergo spontaneous radioactive decay.](https://commons.wikimedia.org/wiki/Special:FilePath/Thorium decay chain from lead-212 to lead-208.svg?width=200 "β<sup>−</sup> decay]]. The final decay product, lead-208 (<sup>208</sup>Pb), is stable and can no longer undergo spontaneous radioactive decay.")
Wikipedia
Radiometry is a set of techniques for measuring electromagnetic radiation, including visible light. Radiometric techniques in optics characterize the distribution of the radiation's power in space, as opposed to photometric techniques, which characterize the light's interaction with the human eye. The fundamental difference between radiometry and photometry is that radiometry gives the entire optical radiation spectrum, while photometry is limited to the visible spectrum. Radiometry is distinct from quantum techniques such as photon counting.
The use of radiometers to determine the temperature of objects and gasses by measuring radiation flux is called pyrometry. Handheld pyrometer devices are often marketed as infrared thermometers.
Radiometry is important in astronomy, especially radio astronomy, and plays a significant role in Earth remote sensing. The measurement techniques categorized as radiometry in optics are called photometry in some astronomical applications, contrary to the optics usage of the term.
Spectroradiometry is the measurement of absolute radiometric quantities in narrow bands of wavelength.
