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प्रश्न
What is meant by activity or decay rate? Give its unit.
उत्तर
Activity (R) or decay rate which is the number of nuclei decayed per second and it is denoted as
R = `|"dN"/"dt"|`
R = `|"dN"/"dt"|` = λN0e-λt
R = R0e-λt
The SI unit of activity R is Becquerel and one Becquerel (Bq) is equal to one decay per second. There is also another standard unit for the activity called Curie (Ci).
1 Curie = 1 Ci = 3.7 × 1010 decays per second
1 Ci = 3.7 × 1010 Bq
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