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Many medical imaging techniques, such as X-rays and CT scans, expose patients to ionizing radiation. 1. If a chest X-ray delivers 0.25 mSv to 5.0 kg of tissue in the chest, how much total energy (in joules) does the tissue receive? Show your work. 2. How many joules of energy does a 75-kg person receive from environmental background radiation each year? Assume this radiation has an RBE of 1. Show your work. 3. How many chest X-rays would it take for a 75-kg person to receive the same total amount of energy from natural sources of radiation in one year? Show your work.4. A single CT scan delivers 12 mSv to the entire body. How many chest X-rays would it take for a 75-kg person to receive the same total amount of energy as from a single CT scan? Assume the radiation from a CT scan has an RBE of 1. Show your work. 5. How does the amount of energy a person receives from a CT scan compare to the amount from natural sources of radiation?

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