________ use X- rays and gamma rays to treat people with cancer.
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Ultraviolet radiation
________ is produced by the sun, and exposure to it is what gives people a suntan.
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X rays
________ pass easily through flesh but no so easily through denser material like bones or metal.
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Security pens
________ can be used to mark property with you name, under UV light the ink will glow, but its invisible otherwise.
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Fluorescence
________ is a property of certain chemicals, where ultra- violet radiation is absorbed and then visible light is emitted.
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Gamma radiation
________ can also be used as a medical tracer- this is where a gamma- emitting source is injected into the patient, and its progress is followed around the body.
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Fibre optic cables
________ use visible light to transmit data.
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Radiographers
________ in hospitals take X- ray photographs of people to see if they have any broken bones.
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X rays
Both ________ and gamma rays can be harmful to people so radiographers wear lead aprons and stand behind a lead screen or leave the room to keep their exposure to them to a minimum.
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