Electron and Photon attenuation

Following online services provide the electron and photon attenuation coefficients with user specified composition of materials. ESTAR and XCOM, written by M.J. Berger (NIST), calculates the value.

ESTAR Stopping powers and ranges for electrons.
XCOM Photon cross sections and attenuation coefficients.

For more information, refer to NIST Physical Reference Data.

Courtesy of M.J. Berger (NIST)