dangers of electromagnetic waves

• when EM radiation enters living tissue - it's often harmless but sometimes it creates havoc. the effects of each type of radiation are based on how much energy the wave transfers
• low frequency waves don't transfer much energy and so mostly pass through soft tissue without being absorbed. High frequency all transfer lots of energy and so can cause damage
• UV, X rays and gamma rays are high frequency waves
• radio waves are low frequency waves
• UV radiation damages surface cells, sunburns and cause risk to cancer or blindless
• x rays and gamma rays are types of ionising radiation (carry enough energy to knock electrons off atoms). can cause gene mutations or cell destruction, and cancer
• radiation dose , measured in sieverts, is a measure of the risk of harm from the body being exposed to radiation. risk depends on the the total amount of radiation and how harmful it is
• a CT scan uses X rays and a computer to build a picture of the inside of patients body, having a CT scan on chest is more likely to suffer damage to genes than to your head