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Gamma rays n + r. + + + n Excited (unstable) nucleus FIGURE 1.6 Graphical illustration of isomeric transition. mm + Characteristic X-ray Nucleus with excessive proton FIGURE 1.5 Graphical illustration of electron capture. Nuclear Engineering A patient is injected with 1110 MBq Tc-99m-MDP (Tp1/2 = 6.02 hours) for a whole-body bone scan. Two hours later, the patient is imaged with a gamma camera. Assuming that 20% of the activity has been excreted by the kidneys, how much activity remains at the time of imaging? (Ctrl)