Einsteinium-251

What this means

Federal rules list Einsteinium-251 as a hazardous substance, with the reporting threshold — called the reportable quantity, or RQ — shown above. If this much (or more) is spilled or released, it has to be reported to authorities. For radioactive materials, that threshold is measured in curies and terabecquerels instead of pounds. Knowing the RQ is one piece of hazmat compliance, not the whole picture — you'll still need to confirm the proper shipping name, packaging, and labeling separately.

How people use this record

• Check whether this material is on the federal hazardous substances list at all.
• Get the reporting threshold without digging through a 500-page PDF.
• Compare it to how much you actually have on hand or in a package.
• Use it as a starting point, then check the full Hazardous Materials Table for shipping requirements.