page_title: Becquerel
section_title: Relation to other radiation-related quantities
hierarchical_section_title: Becquerel / Relation to other radiation-related quantities
caption_attribution_description: English: Graphic showing relationship between radioactivity and detected ionising radiation, including the transport element. Incorporates inverse square law by author borb and alpha decay svg by author Inductiveload.
context_page_description: The becquerel is the SI derived unit of radioactivity. One becquerel is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. For applications relating to human health this is a small quantity, and SI multiples of the unit are commonly used.
  The becquerel is named after Henri Becquerel, who shared a Nobel Prize in Physics with Pierre and Marie Skłodowska Curie in 1903 for their work in discovering radioactivity.
context_section_description: The following table shows radiation quantities in SI and non-SI units. WR (formerly 'Q' factor) is a factor that scales the biological effect for different types of radiation, relative to x-rays. (e.g. 1 for beta radiation, 20 for alpha radiation, and a complicated function of energy for neutrons)
  In general conversion between rates of emission, the density of radiation, the fraction absorbed, and the biological effects, requires knowledge of the  geometry between source and target, the energy and the type of the radiation emitted, among other factors.
caption: Graphic showing relationships between radioactivity and detected ionizing radiation
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