any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.
any method of dating material based on the decay of its constituent radioactive atoms, such as potassium-argon dating or rubidium-strontium dating Also called radioactive dating
A method for determining the age of an object based on the concentration of a particular radioactive isotope contained within it. For inorganic materials, such as rocks containing the radioactive isotope rubidium, the amount of the isotope in the object is compared to the amount of the isotope’s decay products (in this case strontium). The object’s approximate age can then be figured out using the known rate of decay of the isotope. For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms. Radiocarbon dating is one such type of radiometric dating.
[rey-dee-oh-mahy-krom-i-ter] /ˌreɪ di oʊ maɪˈkrɒm ɪ tər/ noun 1. an instrument for measuring small amounts of radiant energy, consisting of a sensitive thermocouple connected to a galvanometer. /ˌreɪdɪəʊmaɪˈkrɒmɪtə/ noun 1. an instrument for detecting and measuring small amounts of radiation, usually by a sensitive thermocouple
- Radio microphone
noun 1. a microphone incorporating a radio transmitter so that the user can move around freely
/ˌreɪdɪəʊmɪˈmɛtɪk/ adjective 1. (of drugs) producing effects similar to those produced by X-rays radiomimetic ra·di·o·mi·met·ic (rā’dē-ō-mĭ-mět’ĭk) adj. Affecting living tissue as does radiation.
radionecrosis ra·di·o·ne·cro·sis (rā’dē-ō-nə-krō’sĭs, -ně-) n. Necrosis due to excessive exposure to radiation.