• The lower energy of Selenium-75 provides improved radiographic contrast sensitivity for thinner materials (0.1-1.2 inches; 2.5-3.0 mm).
  • Lower energy translates to more effective shielding efficiency for collimators, portable shields, and radiography devices.
  • Selenium-75 has a significantly longer half-life than Iridium-192.

SPEC Se-75
SPEC DeviceSPEC-150 or
Source ModelSPEC G-60 or
Activity Availabilityup to 81 Ci (3 TBq)
Se-75 Physical Data
Half-life119.8 days
Exposure Rate Constant0.20 mR-m2/hr-Ci
Energy Range100-400 keV

Source Connecting Options

This image has an empty alt attribute; its file name is multisourcev2.png

SPEC offers different source connecting adapters that fit most radiography devices. Please contact us for more information on which adapters are best for your devices.
Source Connector Options