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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]).
[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). In the context of radioactivity , activity or total activity (symbol A ) is a physical quantity defined as the number of radioactive transformations per second that occur in a particular ...
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.
Disintegrations per minute (dpm) and disintegrations per second (dps) are measures of the activity of the source of radioactivity. The SI unit of radioactivity, the becquerel (Bq), is equivalent to one disintegration per second. This unit should not be confused with cps, which is the number of counts received by an instrument from the source.
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: ...
Spending accelerated sharply in the second quarter to an annual rate of 2.3%, up from 1.5% in the first quarter, as consumers spent a bit less on services but much more on goods.
About 4,000 nuclei of 40 K [18] decay per second, and a similar number of 14 C. The energy of beta particles produced by 40 K is about 10 times that from the beta particles from 14 C decay. 14 C is present in the human body at a level of about 3700 Bq (0.1 μCi) with a biological half-life of 40 days. [ 19 ]
Bill Gates told Patrick Collison that younger generations should worry about four things. They are the climate crisis, unchecked AI, nuclear war, and the spread of disease.
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