Cesium-137 (¹³⁷Cs)

Safety Summary

Regulatory Status

Sources

These citations are the ones recorded for the human adult context.

• IAEA: The Radiological Accident in Goiânia — Cesium-137 Orphan Source Contamination, 4 Deaths, 250 Exposed, Prussian Blue Treatment, and Lessons for Orphan Radioactive Source Control (1988) REGULATORY · 1988
• US EPA Radionuclide Basics: Cesium-137 (physical half-life ~30 yr; beta/gamma emitter; fission product) REGULATORY · 2020
• where to look IAEA Chernobyl Forum: Environmental and Health Consequences of the Chernobyl Accident — Cs-137 Long-Term Surface Contamination REGULATORY · 2006
• Permissible Exposure Limits – OSHA Annotated Table Z-1 REGULATORY
• OEHHA Proposition 65 List of Carcinogens or Reproductive Toxicants (CSV, list date 31-Jul-26) REGULATORY

The IARC classification shown under Regulatory Status is cited to the source below. It is a record-wide citation for that classification, not a source for the adult risk band.

• IARC Monographs Volume 100D (2012): Cesium-137 is Group 1 via the internally-deposited beta-particle-emitter category ("Internalized radionuclides that emit beta particles are carcinogenic to humans, Group 1"). IARC found evidence for caesium-137 ALONE inadequate — the Group-1 basis is the category / fission-product mixtures, not the individual nuclide. REGULATORY · 2012

Same data as the API response, which is open and needs no key. The full per-record source list is available to authenticated callers.