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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]).
The second year of the program, Charles Kuralt, the late television news broadcaster and author, was one of the winners. It is endorsed by the contest criteria of the National Association of Secondary School Principals and is designed to foster patriotism by allowing students the opportunity to voice their opinion in a three- to five-minute ...
[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 ...
Students from Petoskey Middle School and Harbor Springs Middle School were recently named as award winners in the 55th annual America & Me Essay Contest.
The reports say for years Chelyabinsk dumped about 120 million curies of radioactive waste to give you an idea of how much ... The 10 hardest restaurant reservations to book in America. Lighter Side.
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 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.
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.