For Class 6.1, the level of danger is determined by testing the substance on laboratory animals (usually rats) to find out the quantity or concentration required to kill 50% of the test group. The tests are called LD50 (Lethal Dose: 50%) and LC 50 (Lethal Concentration: 50%).
Infectious substances in Category A are known or suspected to cause disease. The label and placard both show a biomedical symbol, and the label has emergency instructions. There are only two shipping names for Category A.
Infectious substances in Category B aren’t as hazardous as those in Category A. Instead of the biomedical symbol, Category B containers just show the UN number in a diamond. If you’re handling, shipping or transporting infectious substances, especially ones in Category A, you might need special training or more information. Please take note of the Health Canada Office of Laboratory Security Biosafety Division (613) 957-1779.
Class 7 – radioactive materials – give off a kind of energy that breaks down atoms and molecules. Exposure to radiation can damage tissue and bones, or cause cancer and genetic mutation. Next time an X-ray is taking place on your job site, you better have some respect for radiation signs and governor yourself accordingly!
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