What is the correct sequence to monitor when identifying an unknown hazardous material?

The correct sequence for monitoring when identifying an unknown hazardous material centers around safety and the potential risks posed by the material. Starting with radiation is essential because it can present immediate dangers, such as harmful exposure, which need to be assessed before any other evaluations.

After addressing the potential for radioactive hazards, the next critical factor to check is oxygen availability. Since many hazardous materials can displace oxygen or pose asphyxiation risks, ensuring that there is an adequate oxygen level is vital for the safety of responders.

Following oxygen assessment, evaluating flammability becomes necessary. Identifying flammable materials helps in understanding fire hazards associated with the substance, allowing responders to implement the appropriate firefighting or containment measures.

Finally, assessing toxicity is equally important. While all these aspects are critical, toxicity evaluations can often be conducted after confirming that the immediate dangers from radiation, oxygen levels, and fire hazards are addressed. This sequence ensures comprehensive safety checks, prioritizing the most immediate threats to responders and the surrounding environment.