WebJul 2, 2016 · The rays that are most damaging to our skin are called ultraviolet (UV) rays. There are two basic types of ultraviolet rays that reach the earth’s surface—UVB and UVA. UVB rays are responsible for producing sunburn. The UVB rays also play the greatest role in causing skin cancers, including the deadly black mole form of skin cancer ... WebLearning objectives. Describe a fluorescent low-pressure mercury type of UVB phototherapy unit; ... Ultraviolet-B (UVB) is the name given to the waveband of electromagnetic radiation ranging from 290 to 320 nm. ...
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