Here are a few notes about the biological role of promethium.

Here are a few notes about the hazards and risks associated with promethium.

Promethium compounds are encountered rarely by most people. Promethium does not occur naturally in the biosphere and so normally never presents a risk. Promethium is studied in a few nuclear research laboratories where its high radioactivity require special handling techniques and precautions. All promethium compounds should be regarded as highly toxic largely because of its radiological toxicity. The metal dust presents a fire and explosion hazard.