(DAC) Part of the interface that converts digital numbers from the computer into analog (ordinary) voltages or currents.

Process of conversion of continuous (analog) signals, such as the detected radiation (voltage), into numbers. This is carried out with an analog to digital converter. There are two kinds of discretization involved: the voltage is only measured (sampled) at particular discrete times and only voltages within a particular range and separated by a particular minimum amount can be distinguished. Voltages beyond this range are said to exceed the dynamic range of the digitizer.

The dilution analysis is used to calculate the quantity of an unknown substance by addition of a radioactively marked substance with a well-known quantity and a well-known specific activity.

(DMSA) Dimercaptosuccinic acid is a medicinal drug used in connection with 99mTc for kidney scintigraphy.

An electronic diode is a component that restricts the direction of movement of charge carriers. Mainly, a diode allows an electric current to flow in one direction, but blocks it in the opposite direction.