1g sample of Radon-222 is taken .the half life of radon is 3.8days.what is the activity of sample taken?

Activity of the sample,dNdt=-λNHere λ=0.693t1/2=0.6933.8=0.182 day-1dNdt=-0.182×m×NAMwhere,NA is avagadro no.=6.023×1023m = 1gM= 222 dNdt=-0.182×1×6.023×1023 222        =-0.00493×1023=4.93×1019 Bq

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