Man-made
Packages containing hazardous materials can usually be identified by the presence of Hazard Class labels.
There are several ways:DOT Hazardous Materials classification labels are used to identify packages containing hazardous materials.Most hazardous material packages are marked with diamond-shaped warning labels showing weather it is a flammable or corrosive, radioactive or explosive material. They will also carry the UN / ID number such UN1203.Square-on-point labels displaying the hazard category are used to identify packages containing hazardous materials.Packages are identified as containing hazardous materials subject to transportation regulations by placing on them the appropriate square-on-point hazard class label and by including the required entries on the shipping papers.
In the context of hazardous material (dangerous goods) a division or class is a number identifying the hazard category of a hazardous material (dangerous good). There are nine hazard classes, several of which are subdivided into divisions.
The placard on a tanker carrying hazardous materials will tell you the class of the hazard (flammable, explosive, corrosive, etc). If you have access to the North American Guide or a similar reference, the placard will also tell you something a bit more specific about the identity of the hazardous material - its category, or sometimes its chemical name.
The DOT (Department of Transportation) class for radioactive materials is Hazardous. The specific Hazard number will be determined by the exact name of the radioactive materials. Special permits and placarding are needed for vehicles carrying hazardous materials. The DOT class is categorized into 9 classes according to hazardous materials transportation. Class 7 is the general DOT class for radioactive materials.
It is the hazard group for spontaneously combustible materials.
Never
There is no minimum weight for the transportation of hazardous materials. You can transport as little as you like.
Hazard Class 8 is for corrosive materials
The hazard class of the substance being carried
In the realm of hazardous materials (dangerous goods) transportation, and within the GHS scheme, Hazard Class 7 is for radioactive materials.
The DOT system of placards and labels classifies hazardous materials according to their type of hazard, i.e. radioactive, corrosive, flammable liquid, etc.