It is a branch of natural science that examines the building blocks of matter, including the atoms, molecules, and ions that make up compounds and their composition, structure, behaviour, and changes that occur when they interact with other things. The quantum mechanical approach is currently used...
and there are rules on hazardous materials. Trucks with loads that contain more than the DOT radioactivity limit could be required to be placarded with a radioactivity symbol, meet strict requirements for the container carrying the radioactive substance, and uphold hazmat-training requirements ...