1. A vial containing 99mTc is labeled " 8mCi/mL at 9 AM". 1) What is the activity of the sample at 1PM on the same day? (5 points) 2) What volume should be withdrawn at 1PM (on the same day) to prepare an injection of 3mCi for a patient? (5 points) 2. Considering another tracer - the activity of the tracer at t=0 is 7.51010dps. Its activity reduces to 0.81010dps after 8 hours. What is the half-life? (5 points)