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It was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)", [1] but is currently defined as 1 Ci = 3.7 × 10 10 decays per second [4] after more accurate measurements of the activity of 226 Ra (which has a specific activity of 3.66 × 10 10 Bq/g [5]).
Cost of a college dorm The average cost of room and board was $11,500 for a public school and $12,990 at private colleges for the 2019-2020 academic year, according to a report by College Data.
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).
The Curie is a unit of measurement (3.7 × 10 10 decays per second or 37 gigabecquerels) used to describe the intensity of a sample of radioactive material and was named after Marie and Pierre Curie by the Radiology Congress in 1910. [21] [22]
The reports say for years Chelyabinsk dumped about 120 million curies of radioactive waste to give you an idea of how much that is -- it's two and a half times the amount of radiation released in ...
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]
The rep has variously been defined as 83 or 93 ergs per gram of tissue (8.3/9.3 mGy) [13] or per cc of tissue. [ 14 ] In 1953 the ICRU recommended the rad, equal to 100 erg/g as a new unit of absorbed radiation, [ 15 ] but then promoted a switch to the gray in the 1970s.
isotope half-life 10 −6 seconds ; lead-196m2 <1 polonium-192m ~1 radon-210m3: 1.04 thorium-219: 1.05 polonium-206m2: 1.05 radon-210m2: 1.06 curium-243m: 1.08 actinium-218