120lodine 131 decay100lodine 131 parent isotope %806040200010202030Time (days)404050506050 d) Below is a decay curve for iodine-131. This is used inthe treatment of thyroid cancer. Radioactive iodineshould not remain in the body at high levels. A safeamount is 2 g of iodine-131 remaining in the body after24 days.Considering the decay rate, use the graph below towork out the largest safe mass of iodine-131 that shouldbe used for treatment?

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