Answer
Also $3.66 \times 10^7 Bq $
Work Step by Step
The activity of $^{222} Rn$ also $3.66 \times 10^7 Bq $ because the rate of decay is equal to the rate of production.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.