How many milliroentgen (mR) are in one roentgen (R)?

One roentgen (R) is equal to 1000 milliroentgen (mR). This relationship is based on the fact that the prefix 'milli-' denotes a factor of one-thousandth. Therefore, when converting roentgen to milliroentgen, you multiply the number of roentgens by 1000 to obtain the equivalent value in milliroentgen.

Since the question specifically asks for a conversion from roentgen to milliroentgen, understanding these basic metric prefixes is essential for accurate calculations in radiation measurement. This foundational knowledge is particularly important in fields like industrial radiography, where precise measurement of radiation exposure is crucial for safety and compliance with regulations.