Radioactive tracers are used to study ion transport across cell membranes. The beta-minus emitting isotope 42K (t₁/2 12.4 h) has been particularlyimportant for measuring the movement of potassium ions. A saline solution that contains the isotope bathes cells in a test tube, and the amount of 42K thathas accumulated inside the cells is measured after a short time. A sample of liquid extracted from the cells must have an activity of at least 50 Bq for anaccurate measurement to be made. The activity of a sample just after extraction is 550,000 Bq. If a scientist wishes to confirm the result by measuring thesample a week later, how much activity will remain?Bq=Can an accurate measurement be made from the sample that is extracted a week after the initial extraction? (One Submission)NoYes

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