Americium-241 (Am-241)

Americium sealed sources emit both gamma rays and alpha particles, and are commonly used in industrial measuring and gauging devices, radiology, chemical investigations, and medical applications.

Our Americium-241 sealed source designs provide a cost-effective alternative to OEMs, meeting or exceeding regulatory requirements for radiation source encapsulations.


Half Life: 432 Years

Primary Emission: Gamma

Primary Energy: 14-20 KeV

RWL: 5 Years

Capsule Materials: Stainless steel with Beryllium window


Americium-241 History

Americium-241 was discovered in 1944 by Dr. Glenn Seaborg and his colleagues at the University of Chicago. Americium is a radioactive element in all its isotopic forms. It was named after the continent of America.


Americium-241 Applications

Thickness Gauging – Americium-241 is used in the measurement of light alloys, glass, plastics, and rubber for which beta sources are not suitable.

Material Analysis – Americium-241 is used to excite radiation in non-destructive testing elemental analysis applications.

Flow Gauging – Americium-241 and a detector are placed on opposite sides of the material to be measured. Gamma radiation transmitted through the sample is then directly related to the sample thickness.


Custom Design Services

QSA has a large standard product list available to fit your application. Custom sealed source designs are possible for large orders. Contact QSA for more information.



Measured by National labs and statistically verified by QSA. Standard certificates available upon request.


Quality Control

QSA Global uses a multi-part quality assurance system to ensure Americium radiation sources meet the highest integrity levels in the industry, including all statutory and international regulatory requirements.

Wipe Test I – Americium-241 sources are wiped with a swab or tissue, moistened with ethanol or water, then measured for removed activity.

Immersion Test II – Americium-241 sources are immersed in a suitable liquid at 50°C for at least 4 hours, then measured for removed activity.

Bubble Test III – Americium-241 sources are immersed in water or a suitable liquid, and the pressure in the vessel is reduced to 13kPa (100mm Hg). No bubbles must be observed.


Contact QSA for additional information on Americium-241 sealed source designs.