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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 honour of Marie Curie as well, [ 2 ] and is in later literature considered to be named for both.
In the 1930s the roentgen was the most commonly used unit of radiation exposure. This unit is obsolete and no longer clearly defined. This unit is obsolete and no longer clearly defined. One roentgen deposits 0.877 rad in dry air, 0.96 rad in soft tissue, [ 9 ] or anywhere from 1 to more than 4 rad in bone depending on the beam energy. [ 10 ]
The becquerel succeeded the curie (Ci), [12] an older, non-SI unit of radioactivity based on the activity of 1 gram of radium-226. The curie is defined as 3.7 × 10 10 s −1 , or 37 GBq. [ 4 ] [ 13 ]
Curie (unit) (Ci), unit of radioactivity; Curie (lunar crater) Curie (Martian crater) Curie (rocket engine), a liquid-propellant engine designed by Rocket Lab; Curie temperature, also known as the Curie point; Curie's law; Intel Curie, a sub-miniature x86/Quark-based platform for wearable applications; Curium, a synthetic chemical element with ...
The NIST recognizes that this unit is outside the SI but temporarily accepts its use in the U.S. with the SI. [8] The rem remains in widespread use as an industry standard in the U.S. [23] The United States Nuclear Regulatory Commission still permits the use of the units curie, rad, and rem alongside SI units. [24]
The curie (symbol Ci), a unit of radioactivity, is named in honour of her and Pierre Curie (although the commission which agreed on the name never clearly stated whether the standard was named after Pierre, Marie, or both). [96] The element with atomic number 96 was named curium (symbol Cm). [97]
The commission has been responsible for defining and introducing many of the following units of measure. The number of different units for various quantities is indicative of changes of thinking in world metrology, especially the movement from cgs to SI units. [6] The following table shows radiation quantities in SI and non-SI units.
The roentgen or röntgen (/ ˈ r ɛ n t ɡ ə n,-dʒ ə n, ˈ r ʌ n t-/; [2] symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays, and is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air (statcoulomb per kilogram).