Abbreviations for Radiation Measurements: When the amounts of radiation being measured are less than 1, prefixes are attached to the unit of measure as a type of shorthand. This is called scientific notation and is used in many scientific fields. The table below shows the prefixes for radiation measurement and their associated numeric notations. Prefix: centi-, Equal to: 1 X 10-2, How Much is That?: .01, Abbreviation: c, Example: cSv; Prefix: kilo-, Equal to: 1 X 103, How Much is That?: 1000, Abbreviation: k, Example: kCi; Prefix: mega-, Equal to: 1 X 106, How Much is That?: 1,000,000, Abbreviation: M, Example: MCi; Prefix: giga-, Equal to: 1 X 109, How Much is That?: 100,000,000, Abbreviation: G, Example: GBq; Prefix: tera-, Equal to: 1 X 1012, How Much is That?: 100,000,000,000, Abbreviation: T, Example: TBq; Prefix: peta-, Equal to: 1 X 1015, How Much is That?: 100,000,000,000,000, Abbreviation: P, Example: PBq; Prefix: exa-, Equal to: 1 X 1018, How Much is That?: 100,000,000,000,000,000, Abbreviation: E, Example: EBq. When the amount to be measured is 1,000 (i.e., 1 X 10³) or higher, prefixes are attached to the unit of measure to shorten very large numbers (also scientific notation). The table below shows the prefixes used in radiation measurement and their associated numeric notations