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radiation units

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activity

Overview page. Subjects: Chemistry — Physics.

1. Symbol a. A thermodynamic function used in place of concentration in equilibrium constants for reactions involving nonideal gases and solutions. For example, in a reaction

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becquerel

Overview page. Subjects: Science and Mathematics — Medicine and Health.

n. the SI unit of activity of a radioactive source, being the activity of a radionuclide decaying at a rate of one spontaneous nuclear transition per second. It has replaced...

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curie

Overview page. Subjects: Chemistry.

The former unit of activity (see radiation units). It is named after Marie Curie.

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dose

Overview page. Subjects: Chemistry.

A measure of the extent to which matter has been exposed to ionizing radiation. The absorbed dose is the energy per unit mass absorbed by matter as a result of such exposure. The SI unit is...

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gray

Overview page. Subjects: Science and Mathematics — Medicine and Health.

n. the SI unit of absorbed dose of ionizing radiation, being the absorbed dose when the energy per unit mass imparted to matter by ionizing radiation is 1 joule per kilogram....

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radioactivity

Overview page. Subjects: Science and Mathematics.

The spontaneous fission of the nuclei of certain unstable (radioactive) elements or isotopes into more stable configurations, which gives rise to daughter elements or isotopes. In certain...

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roentgen

Overview page. Subjects: Chemistry.

The former unit of dose equivalent (see radiation units). It is named after the discoverer of X-rays, W. K. Roentgen (1845–1923).

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sievert

Overview page. Subjects: Science and Mathematics — Medicine and Health.

[R. M. Sievert (1896–1966), Swedish radiologist] n. The SI unit (International System of Units) for measuring equivalent and effective radiation doses. See also dose.

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