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If a patient is administered 40 ng of technetium−99m, how much will remain 1 d later,...

If a patient is administered 40 ng of technetium−99m, how much will remain 1 d later, assuming that no technetium has been eliminated by any other process? The half-life of technetium−99m is 6 hours.

??ng of technetium−99m remain

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