Rachel has an unknown sample of a radioisotope listed in the table. Using a special technique, she is able to measure the mass of just the unknown isotope as 104.8 kg at 12:02:00 P. M. At 4:11:00 P. M. on the same day, the mass of the unknown radioisotope is 13.1 kg. Which radioisotope is in the sample?
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