The absence of any hazard class or division or a blank space in the table indicates that no restrictions apply.- X: These materials may not be loaded, transported, or stored together in the same transport vehicle or storage facility during the course of transportation.
- O: Indicates that these materials may not be loaded, transported or stored together in the same transport vehicle or storage facility during the course of transportation, unless separated in a manner that, in the event of leakage from packages under conditions normally incident to transportation, commingling of hazardous materials would not occur.
- B: Radioactive I and II are not required to be placarded, and does not have segregation requirements. Radioactive III must be placarded in any quantity.
- I - Extremely low radiation levels: 0.5 millirems (0.0050 mSv) per hour.
- II - Low radiation levels: >0.5–50 millirems (0.0050–0.5000 mSv) per hour, on surface. 1.0 millirem (0.010 mSv) maximum at 3.3 feet (1 m).
- III - Higher radiation levels: >50–200 millirems (0.50–2.00 mSv), on surface. 10 millirems (0.10 mSv) maximum at 3.3 feet (1 m).[1]
Source: United States Code of Federal Regulations, Title 49 CFR §177.848 - Segregation of hazardous materials.[2]
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