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The half-lives of radioisotopes are given below.

  • arsenic-74 - 18 min
  • iodine-131 - 8 min
  • phosphorus-32 - 14 min
  • chromium-51 - 28 min

If the initial amount of chromium-51 is 133 mCi, how much chromium-51 is left in the body after 84 days?(Answer in mCi)

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