Becquerel
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The becquerel is the unit of radioactivity in the International System of Units. One becquerel is defined as an activity of one per second, on average, for aperiodic activity events referred to a radi
Radium-226 radiation source. Activity 3300 Bq (3.3 kBq)
Curie (unit)
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The curie 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, but was considered at least by some t
Becquerel
…and the becquerel (Bq) were introduced in 1975. Between 1953 and 1975, absorbed dose was often measured with the rad. Decay activity was given with the curie before 1946 and often with the rutherford between 1946 and 1975. As with every International System of Units (SI) unit named after a person, the first…
A sample of radium, the element which was used in the original definition of the curie.
Sample of cobalt-60 that emits 1 μCi (microcurie) of radioactivity; i.e. 37,000 decays per second.