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85 A radioactive seed with iodine-125 is placed near the cancerous cells in a patient. What percentage of the radioactive material in the seed remains

85 A radioactive "seed" with iodine-125 is placed near the cancerous cells in a patient. What percentage of the radioactive material in the seed remains after 180 days? ( lodine-125 has a half-life of 60 days. )

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