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The becquerel (/ ˌ b ɛ k ə ˈ r ɛ l /; symbol: Bq) is the unit of radioactivity in the International System of Units (SI). One becquerel is defined as an activity of one decay per second. For applications relating to human health this is a small quantity, [1] and SI multiples of the unit are commonly used. [2] The becquerel is named after ...
Specific activity. Specific activity (symbol a) is the activity per unit mass of a radionuclide and is a physical property of that radionuclide. [1][2] It is usually given in units of becquerel per kilogram (Bq/kg), but another commonly used unit of specific activity is the curie per gram (Ci/g). In the context of radioactivity, activity or ...
An older unit of radioactivity is the curie, Ci, which was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)". [21] Today, the curie is defined as 3.7 × 10 10 disintegrations per second, so that 1 curie (Ci) = 3.7 × 10 10 Bq.
Disintegrations per minute (dpm) and disintegrations per second (dps) are measures of the activity of the source of radioactivity. The SI unit of radioactivity, the becquerel (Bq), is equivalent to one disintegration per second. This unit should not be confused with cps, which is the number of counts received by an instrument from the source.
3.7×1010 s −1. Sample of cobalt-60 that emits 1 μCi (microcurie) of radioactivity; i.e. 37,000 decays per second. The curie (symbol Ci) is a non- SI unit of radioactivity originally defined in 1910. According to a notice in Nature at the time, it was to be named in honour of Pierre Curie, [ 1 ] but was considered at least by some to be in ...
Becquerel was elected a Foreign Member of the Royal Society (ForMemRS) in 1908. [1] Becquerel has been honored with being the namesake of many different scientific discoveries. The SI unit for radioactivity, the becquerel (Bq), is named after him. [28] There is a crater named Becquerel on the Moon and also a crater named Becquerel on Mars.
becquerel: Bq: 1 Bq = 1/s: The becquerel is a special name for second to the power minus one, to be used as the SI unit of activity. curie: 1 Ci = 3.7×10 10 Bq (exactly) ⋮ absorbed dose: D: For any ionizing radiation, the mean energy imparted to an element of irradiated matter divided by the mass of this element gray: Gy: 1 Gy = 1 J/kg
Number of particles decaying per unit time becquerel (Bq = Hz) T −1: extensive, scalar (Radiation) Dose: D: Ionizing radiation energy absorbed per unit mass gray (Gy = J/kg) L 2 T −2: Radiance: L: Power of emitted electromagnetic radiation per unit solid angle per emitting source area W/(m 2 ⋅sr) M T −3: Radiant intensity: I