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A nurse practitioner is educating a patient about the risks associated with excessive exposure to radiation from diagnostic imaging. The nurse practitioner explains that cancer mortality is known to increase with annual radiation exposure exceeding:
• 1. 0-10 millisieverts
• 2. 10-20 millisieverts
• 3. 20-30 millisieverts
• 4. 30-40 millisieverts
• 5. 50-100 millisieverts