the process of making radiographs, and the science of analyzing them

(physics) a radioactive isotope of an element

examination of objects by the use of X-rays; radiology

(medicine) The specialty of medical imaging and its interpretation, originally and especially radiography but now including all imaging modalities, including ones that use no radiation (such as ultrasonography and magnetic resonance imaging).

The study of the acoustics of sounds as carried and reproduced by radio

A photophone. / A radiotelephone.

(astronomy) The magnitude of a star as determined by radiometry.

A radioactive isotope of carbon, especially ¹⁴₆C

(physics, archaeology, paleontology) A method of estimating the age of an artifact or biological vestige based on the relative amounts of the different isotopes of carbon present in a sample.

a device that allows two-way communication via radio