Answered: Medical Isotope of Iodine-125 (1251)… | bartleby

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Medical Isotope of Iodine-125 ('2°1) use to treat, brain tumor and prostate cancer and other cancers. 12°1 atom has a half-life of close to 60
days. For treatment, 10 million atoms were prepared.
How many days does it take for 90% of 2°1 the atoms to decay? (after 15 days delivered to the patient, to the delivered amount to decay by
90% of the amount?)

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