What is the relationship between roentgen and milliroentgen?

The correct answer illustrates the metric relationship between roentgen (R) and milliroentgen (mR). Specifically, 1 roentgen equals 1000 milliroentgens. This is derived from the metric system's use of prefixes, where "milli" signifies a factor of one thousandth (1/1000). Therefore, when converting roentgens to milliroentgens, multiplying by 1000 provides the accurate conversion, confirming that there are indeed 1000 milliroentgens in one roentgen. This understanding is essential for radiation safety practices, as it allows for precise measurement and communication of radiation exposure levels which are crucial in both medical and industrial settings.