Selenium-75 Industrial Radioisotopes

Selenium-75 (Se-75) source is formed by compressing the Se-74 (or Se-74 compound) into the desired shape and encasing it in an outer capsule.

Selenium-75 has a significantly longer half-life than Iridium-192.

The lower energy of Selenium-75 provides improved radiographic contrast sensitivity for thinner materials. This also translates to more effective shielding efficiency for collimators, portable shields, and radiography devices.

Energy Range (KeV)100-400
Half Life (days)119.8
Steel Working Thickness (mm)8-30