radiowave, microwave, infra-red, ultra-violet, x-ray, gamma, wavelength, is reflected by the ionosphere , TV & radio, microwave ovens, mobile, wifi, heating, remote controls, fibre optics, night vission, sunbeds, bank note anti-forgery, diagnose broken bones, CT scans, sterilise food in tins and surgical equipment, radiotherapy, all are carrier waves used in communication, all are ionising (cancer causing).

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