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NEET PHYSICSEasy

Curie is a unit of:

A

Energy of \gamma -rays

B

Half life

C

Radioactivity

D

Intensity of \gamma -rays

Step-by-Step Solution

  1. Definition: The 'curie' (symbol: Ci) is a non-SI unit of radioactivity (or activity of a radioactive source).
  2. Value: It is defined as the quantity of any radioactive material in which the number of disintegrations per second is 3.7×10103.7 \times 10^{10}. Mathematically, 1 Ci=3.7×1010 s−11 \text{ Ci} = 3.7 \times 10^{10} \text{ s}^{-1} (disintegrations per second).
  3. SI Equivalent: The SI unit of radioactivity is the becquerel (Bq), where 1 Bq=1 s−11 \text{ Bq} = 1 \text{ s}^{-1}. Thus, 1 Ci=3.7×1010 Bq1 \text{ Ci} = 3.7 \times 10^{10} \text{ Bq}.
  4. Context: This unit was originally based on the activity of 1 gram of the radium isotope 226Ra^{226}\text{Ra}.
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