Problem 5 (25 Points) Tc-99m is used in tens of millions of medical diagnostic procedures annually, making it the most c

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Problem 5 25 Points Tc 99m Is Used In Tens Of Millions Of Medical Diagnostic Procedures Annually Making It The Most C 1 (31.71 KiB) Viewed 36 times

Problem 5 (25 Points) Tc-99m is used in tens of millions of medical diagnostic procedures annually, making it the most commonly used medical radioisotope. The half-life of Tc-99m is 6.0 hours. One decay of Tc-99m produces a gamma ray with an energy of 1.4x10³ eV. Consider a sample of Tc-99m that has an initial activity of 3.5×10¹⁰ Bq. (a) How many Tc-99m nuclei the sample has at t=0? (b) What is the activity of Tc-99m at t=2 hour (unit in Bq)? (c) What is the radiation power of Tc-99m at t=2 hour (unit in Watts)? (d) By what percentage does the radiation power of Tc-99m decrease in 4 hours? (1) Consider a time period of t=0 to t=2 hour. If all of the radiation energy is absorbed by a liver (mass=1.5 kg), what is the radiation dose in Rem? The relative biological effectiveness (RBE) is 2.