Curie is a unit of:

Question

Curie is a unit of:

Accepted Answer

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 $3.7 	imes 10^{10}$. Mathematically, $1 	ext{ Ci} = 3.7 	imes 10^{10} 	ext{ s}^{-1}$ (disintegrations per second). 
3. **SI Equivalent:** The SI unit of radioactivity is the becquerel (Bq), where $1 	ext{ Bq} = 1 	ext{ s}^{-1}$. Thus, $1 	ext{ Ci} = 3.7 	imes 10^{10} 	ext{ Bq}$.
4. **Context:** This unit was originally based on the activity of 1 gram of the radium isotope $^{226}	ext{Ra}$.

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