A radioactive sample has an activity of 5.13 × 10⁷ Ci. Express its activity in ‘becqueral’ and ‘ rutherford ’.

Q: A radioactive sample has an activity of 5.13 × 10⁷ Ci. Express its activity in ‘becqueral’ and ‘ rutherford ’.

Sol: Since 1 Ci = 3.7 × 10¹⁰ decays per second,

Activity = 5.13 x 10⁷ × 3.7 × 10¹⁰ Bq = 1.9 × 10¹⁸ Bq

Since 1 x 10⁶ decay per second = 1 Rd

Activity = 1.9 × 10¹⁸ Bq

= (1.9 × 10¹⁸)/(1 × 10⁶) Rd

= 1.9 × 10¹² Rd.