1.

Calculate the specific activities of Na^(24) and U^(235) nuclides whose half lives are 15 hrs and 7.1 xx 10^8 yrs :

Answer»

`3.2 xx 10^(20), 7.9 xx 10^(7) Bq//kg`
`4.5 xx 10^(22), 4.5 xx 10^(9) Bq//kg`
`1.2 xx 10^(21), 3.8 xx 10^(8) Bq//kg`
`6.2 xx 10^(23), 1.9 xx 10^(10) Bq//kg`

SOLUTION :Specific activity is activitity of unit mass of substance.
No. of atom in 1 kg of `NA^(24)=(6.03 xx 10^(26))/(24)`
`A_(sod) ("activity of sodium")=lambda N`
`=(0.6931)/(15 xx 3600) xx (6.03 x 10^(26))/(24)`
`=3.2 xx 10^(20) Bq kg^(-1)`
`A_("uran")=(0.6931)/(7.1 xx 10^(8) xx 365 xx 86400)=(6.03 xx 10^(26))/(235)`
`=7.9 xx 10^(7) Bq kg^(-1)`


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