The accumulation of radioactive substances in organs or tissues is used for diagnosis and therapy.

See also Bioaccumulation Factor and Administered Activity.

The accuracy is the measurement of the extent of agreement between the measured value and the true value.

Actinides are elements in the periodic table with an equal or higher atomic number than actinium, which has an atomic number of 89 and up to 103 lawrencium, including plutonium, curium, and californium). Actinides are also called 'rare earth metals'.
Actinides include most of the well-known elements found in nuclear reactions with atomic numbers higher than 92. These elements do not occur naturally but are produced by bombarding other elements with particles in an accelerator.

Activation is the production of radionuclides (instable atoms) by bombarding atomic nuclei (stable atoms) with radiation (e.g., photons, neutrons, alpha particles).
With the activation of an atom its decay starts.

See Neutron Activation, Neutron Activation Analysis.

Concentration determination of trace elements, halogens, lead, arsenic and mercury in pharmaceuticals by neutron activation.

See Neutron Activation Analysis.