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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 ...
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.
This past Thursday, November 16, Queen Camilla hosted all the winners of The Queen’s Commonwealth Essay Prize, a competition which has been around for 140 years (since Queen Victoria's reign, to ...
The World Championship Speed Reading Competition stresses reading comprehension as critical. The top contestants typically read around 1,000 to 2,000 words per minute with approximately 50% comprehension or above. The six-time world champion Anne Jones is recorded for 4200 wpm with previous exposure to the material and 67% comprehension.
For policy debaters, who debated the same topic for an entire year, the number of cards could quickly become overwhelming, sometimes requiring 100,000 pieces of paper and 50 boxes of cards per team. [32] As internet research became more accessible, teams began moving to entirely paperless debate, storing research on Word documents.
For the 2021 Open competition, approximately 1300 to 1400 students competed. Since 2008 the contest has consisted of two rounds, the second being administered to the top scorers in the first round. The top-scoring students on the second round qualify for the International Linguistics Olympiad (IOL), one of the international science olympiads.
The Alliance for Young Artists & Writers is a nonprofit organization which manages the annual Scholastic Art & Writing Awards, a competition that recognizes talented young artists and writers from across the United States. [1]