Many units are broken down into smaller units or expressed as multiples, using standard metric prefixes. As examples, a kilobecquerel (kBq) is 1000 Becquerel, a millirad (mrad) is 10-3 RAD, a microrem (µrem) is 10-6 rem, a nanogram is 10-9 grams, and a picocurie is a 10-12 curies.
SI Prefixes
Factor - Prefix - Symbols
1018 - exa - E
1015 - - peta - P
1012 - tera - T
109 - giga - G
106 - - mega - M
103 - kilo - k
102 - hecto - h
101 - deka - da
10-1 - deci - d
10-2 - centi - c
10-3 - milli - m
10-6 - micro - µ
10-9 - nano - n
10-12 - pico - p
10-15 - femto - f
10-18 - atto - a
