 These are the main means of communicating progress by the ICRP in the form of technical presentations and reports from various committees, held approximately every two years since 2011.A year after Röntgen's discovery of X-rays, the American engineer Wolfram Fuchs (1896) gave what is probably the first protection advice, but many early users of X-rays were initially unaware of the hazards and protection was rudimentary or non-existent.The dangers of radioactivity and radiation were not immediately recognized.