REVISION SCIENCE TO EXCEL IN A-LEVEL PHYSICS A-levelPHYSICS7408/3BB Paper 3

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A hospital uses the radioactive isotope technetium-99m as a tracer. Technetium-99m is produced using a Molybdenum-Technetium generator on site at the hospital. Explain why the value of the half-life ... of technetium-99m: • makes it suitable for use as a tracer • means that it must be produced in a generator on site. Technetium-99m emits only gamma rays. Explain why this makes technetium-99m suitable for use as a tracer. Iodine-131 is a medical tracer that can be detected using a gamma camera. Iodine-131 has a physical half-life of 8.0 days. A patient is injected with iodine-131 that has an initial activity of 3.2 GBq. For this patient, the biological half-life is 66 days. For safety reasons, the patient cannot be discharged from hospital until the activity due to the iodine in the patient’s body drops to 1.1 GBq. Determine whether the patient can be safely released from hospital after 10 days. [Show More]

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