What does autoradiography mean?
Autoradiography is a laboratory imaging technique that makes the distribution of a radioactive substance visible by placing the specimen in direct contact with a photographic emulsion, film, or detector: the radiation emitted from within the sample itself exposes the medium, creating an image without any external source. Because the technique shows exactly where labeled molecules travel and concentrate, it has been indispensable in fields such as molecular biology, neuroscience, pharmacology, and medicine — mapping DNA synthesis, receptor binding sites, metabolic pathways, and the uptake of drugs across tissues. The word functions strictly as a technical noun, appearing mainly in formal scientific prose, with derived forms such as the adjective 'autoradiographic' common in the literature. Related terms include 'autoradiograph', denoting an individual image produced by the method. Its enduring usefulness lies in combining exquisite spatial resolution with extraordinary sensitivity.
nounA technique in which a radioactive substance within a specimen produces an image on an overlying photographic emulsion or film, revealing the distribution of that substance. It is widely used to visualize, for example, where radioactively labeled compounds have been incorporated into biological tissue.
- The imaging technique in which radiation emitted from a radioactive substance within a specimen exposes a photographic plate, film, or emulsion placed in contact with it, producing a record of the substance's distribution.
- An individual image or record produced by this technique.
"The researchers used autoradiography to map precisely where the labeled amino acids had been incorporated into the developing brain tissue."
"Autoradiography revealed that the drug accumulated preferentially in the liver and kidneys."
"Each section on the slide was subjected to autoradiography to localize the bound receptor ligand."
Rarely used; when referring to multiple images produced by the technique, scientists typically use the singular mass noun 'autoradiography' or the countable noun 'autoradiographs'.
"The study compared autoradiographies obtained from several different tissue samples."
Autoradiography lets you photograph something invisible — the radiation emitted by radioactive atoms inside a sample literally exposes the film, so the specimen draws its own picture.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of autoradiography
The word combines three elements of Greek origin: 'auto-' (self), 'radio-' relating to radiation, and '-graphy' (writing or recording). It emerged in scientific English in the early twentieth century, following Becquerel's 1896 discovery that uranium salts could fog a photographic plate on their own — effectively the first autoradiograph — and the subsequent development of radiotracer techniques. Cognate formations using the same Greek roots include 'autograph' and 'automatic' (from 'autos'), and 'radiology' and 'photography' (from the radiation- and writing-related elements).
Related word forms
How autoradiography is actually used
A technical term used almost exclusively in scientific contexts — molecular biology, histology, pharmacology, and medical research. The countable plural refers to individual images produced by the technique. The adjective form 'autoradiographic' and adverb 'autoradiographically' are common in scientific writing.
Easily confused with autoradiography
Radiography uses an external source of radiation (such as X-rays) passed through an object to form an image, whereas autoradiography detects radioactivity emitted from within the specimen itself.
Radioautography is essentially a synonym of autoradiography, though some authors reserve it as an older or more general term; the confusion is one of terminology rather than meaning.