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Explain how Technetium-99m ( 99mTc) is used in medical imaging techniques such as single-photon emission computed tomography. Explain the operating principles behind these imaging techniques, as well as discussing how the 99mTc is generated for use in hospital laboratories. If a patient is administered 99mTc in advance of a scan and 99mTc has a half-life of 6.0 hours, what mass of an administered dose of 100g of 99mTc remains in a patient's body after 2.0 days