Counts per minute (cpm) is a measure of radioactivity. Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. It is the number of atoms in a given quantity of radioactive material that are detected to have decayed in one minute. History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny Disintegrations per minute (dpm) is also a measure of radioactivity. It is the number of atoms in a given quantity of radioactive material that decay in one minute. Dpm is similar to cpm, however the efficiency of the radiation detector (e. In experimental and applied Particle physics and Nuclear engineering, a particle detector, also known as a radiation detector, is a device used to g. scintillation counter) must be accounted for when analysing data in cpm. A scintillation counter measures Ionizing radiation. The Sensor, called a Scintillator, consists of a transparent Crystal, usually phosphor Dpm is the number of atoms that have decayed, not the number of atoms that have been measured as decayed. Dpm is commonly used as a measure of radioactive contamination. Radioactive contamination is the uncontrolled distribution of radioactive material in a given environment

• One becquerel (Bq) is equal to one disintegration per second, or 60 dpm. The becquerel (symbol Bq) is the SI derived unit of radioactivity.
• One curie (Ci) is equal to 3. A CURIE (short for Compact URI) is an abbreviated URI expressed in CURIE syntax and may be found in both XML and non-XML grammars 7 x 10 ¹⁰ Bq or dps, which is equal to 2. 22 x 10¹² dpm.

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