Americium-241 (²⁴¹Am)

Safety Summary

Regulatory Status

Sources

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

• US EPA Radionuclide Basics: Americium-241 (~432-yr half-life; alpha/gamma; transuranic) REGULATORY · 2020
• IAEA Safety Reports Series No. 37: Methods for Assessing Occupational Radiation Doses due to Intakes of Radionuclides REGULATORY · 2004
• 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): Americium-241 is Group 1 via the internally-deposited ALPHA-particle-emitter category (“Internalized radionuclides that emit alpha particles are carcinogenic to humans, Group 1”). Am-241 is NOT individually evaluated (sufficient evidence only in experimental animals). 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.