AQA physics unit 3 quiz - X-rays/Ultrasound 0.0 / 5 ? PhysicsMedical PhysicsGCSEAQA Created by: PattiCreated on: 22-05-13 11:24 Which material is best for protection from x-rays? Lead 1 of 10 why do Radiographers stand behind a lead screen? Lead is ionizing and can damage/ cause cells to become cancerous, the lead absorbs the x-rays and protects the radiographer. 2 of 10 What is thew range of human hearing? 20-20000Hz 3 of 10 Is ultrasound a higher or lower frequency then humans can hear? Higher 4 of 10 Name two ways in which an ultrasound can be used medically: Pre-Natal scanning of a fetus and the breaking down of kidney stones 5 of 10 Are ultrasounds safe? As far as anyone knows yes- they are non-ionizing 6 of 10 Name another difference between x-rays and ultrasound: ultrasounds are blurry whereas x-rays are clear and sharp/ultrasounds can create moving pictures 7 of 10 Why are CT scans more dangerous then an x-ray photorgraph? They use more x-rays, so the person is more exposed to the ionizing rays and because of this cells become more damaged/cancerous. 8 of 10 Name a benefit of CT scans over x-ray picture: They produce 3D images and detect soft tissue, so they are good for detecting tumours in organs. 9 of 10 X-rays are also a treatment, what can they treat? Cancer-similarly to Gamma rays 10 of 10
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