If mg sample of technetium 1 - 99m is used for a diagnostic procedure, how much Tc-99m remains after each interval: (a) 6.0 b; (b) 3 days? (The half-of technetium-99m is 6.0 hours.)

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There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.