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The prefix milli stands for one-thousandth (1/1000). A milliroentgen is one-thousandth of a roentgen. There are one thousand (1000) milliroentgens in one roentgen
Roentgen (or Becquerel)Rad (or Grey)Rem (or Sievart)Depending on what you want to measure
W W h W W W h
W W h ... W W W h
Five 'w' could signify the five common question words:whowhatwhenwhywhere