Question

1. Calculate the activity of a 200.0 g sample of natural potassium. Express your answer both in Curies (Ci) and in Becquerel (Bq). 1 Bq = 1 nuclei s−1 1 Ci = 3.700×1010 nuclei s−1

2. Technetium-99m is a metastable form of technetium-99 (isotopic mass = 98.9062547 u) and has a half-life of 6.0058 hours. How many grams of Tc-99m are required to have an activity of 50.0 μCi?

3. Ytterbium-169 is a radioactive isotope. 10.0 μg of pure Yb-169 (isotopic mass = 168.9351820 u) has an activity of 0.24108 Ci. What is the half-life of Yb-169 in minutes?

Answer 1