Ci

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Definition

  1. Adjective:

    • Being one more than one hundred: The Roman numeral "CI" represents the number one hundred and one (101).

  2. Noun:

    • A unit of radioactivity: A "ci" (curie) is a unit of radioactivity equal to the amount of a radioactive isotope that decays at the rate of 37,000,000,000 (37 billion) disintegrations per second.
Examples
  • Adjective:
    • The manuscript was dated CI. (The manuscript was dated 101.)
  • Noun:
    • The sample had an activity of 5 ci. (The sample had an activity of 5 curies.)
    • One ci is a very high level of radioactivity. (One curie is a very high level of radioactivity.)
Advanced Usage
  • Scientific Notation: In scientific contexts, the curie (Ci) is often used alongside or converted to the SI unit, the becquerel (Bq), where 1 Ci = 3.7 × 10¹⁰ Bq.
    • The old measurement was in millicuries, but the new report uses becquerels.
  • Historical Context: The unit is named after Pierre and Marie Curie. While still used, especially in the United States, the becquerel is the SI unit.
Variants and Related Words
  • Curie (Ci): The full name of the unit. Often used interchangeably with the abbreviation "ci".
  • Millicurie (mCi): One thousandth of a curie.
  • Microcurie (µCi): One millionth of a curie.
  • Becquerel (Bq): The SI unit of radioactivity, equal to one disintegration per second.
Synonyms
  • Adjective: hundred-one, one hundred one.
  • Noun: curie (for the full term).
Related Phrases
  • Ci/mmol: A common unit of measurement in biochemistry for the specific activity of a radiolabeled compound, meaning curies per millimole.
    • The tracer had a specific activity of 50 Ci/mmol.
Adjective
  1. being one more than one hundred
Noun
  1. a unit of radioactivity equal to the amount of a radioactive isotope that decays at the rate of 37,000,000,000 disintegrations per second

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