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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 honour of Marie ...
The older, non-SI unit of activity is the curie (Ci), which is 3.7 × 10 10 radioactive decays per second. Another unit of activity is the rutherford, which is defined as 1 × 10 6 radioactive decays per second.
The SI unit of exposure is the coulomb per kilogram ... [27] Radiation is also used as therapy for many different types of cancer. ... curie: Ci 3.7 × 10 10 s −1: ...
Today, the curie is defined as 3.7 × 10 10 disintegrations per second, so that 1 curie (Ci) = 3.7 × 10 10 Bq. For radiological protection purposes, although the United States Nuclear Regulatory Commission permits the use of the unit curie alongside SI units, [ 23 ] the European Union European units of measurement directives required that its ...
One becquerel (Bq) is equal to one disintegration per second; 1 becquerel (Bq) is equal to 60 dpm. [4] One curie (Ci) an old non-SI unit is equal to 3.7 × 10 10 Bq or dps, which is equal to 2.22 × 10 12 dpm. [5]
Surface contamination is usually expressed in units of radioactivity per unit of area for alpha or beta emitters. For SI , this is becquerels per square meter (or Bq/m 2 ). Other units such as picoCuries per 100 cm 2 or disintegrations per minute per square centimeter (1 dpm/cm 2 = 167 Bq/m 2 ) may be used.
The general historical unit for radioactivity, the curie, is based on the radioactivity of 226 Ra. it was originally defined as the radioactivity of one gram of radium-226, [42] but the definition was later refined to be 3.7 × 10 10 disintegrations per second. [43]
1 Bq = 1 s −1. A special name was introduced for the reciprocal second (s −1) to represent radioactivity to avoid potentially dangerous mistakes with prefixes.For example, 1 μs −1 would mean 10 6 disintegrations per second: (10 −6 s) −1 = 10 6 s −1, [4] whereas 1 μBq would mean 1 disintegration per 1 million seconds.