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Explanation:
Thomas Edison created many inventions, but his favorite was the phonograph. While working on improvements to the telegraph and the telephone, Edison figured out a way to record sound on tinfoil-coated cylinders. In 1877, he created a machine with two needles: one for recording and one for playback.
For occupational exposure, the limit is 50 mSv in a single year with a maximum of 100 in a consecutive five-year period, and for the public to an average of 1 mSv (0.001millisievert ) of effective dose per year, not including medical and occupational exposures. japan aloso has one of the one disaster radiation active matiorals are sill there be
