Se-75 Gamma Radiography Sealed Source Wire Assemblies in Holder

Selenium-75 Sealed Sources for Gamma Radiography.

QSA Global, Inc.’s Se-75 sealed radioisotope sources are double-encapsulated and sealed using laser welding for superior quality and safety. Se-75 sources contain a quasi-spherical metallic pellet for the smallest possible focal dimension which minimizes Source-Film-Distance (SFD) and heightens sensitivity on fixed geometries.

Safety is our top priority. QSA Global, Inc. Se-75 sealed radioisotope sources are made of a patented vanadium-selenium metal alloy producing the highest possible thermal stability combined with physical strength and durability compared to commonly used elemental Se-75.  

QSA Global's Se-75 radioisotope sources are available in maximum focal sizes ranging from 1.4 mm to 3.9 mm and nominal activities up to 90 Ci. (3.33 TBq).

View PDF Se-75 Datasheet

Se-75 Attenuation Data

Selenium-75 sealed sources are used throughout the industrial radiography industry to detect structural damage to metal parts. QSA Global, Inc.’s Se-75 sealed sources are designated for use within the steel thickness range of 0.20 in-1.57 in (5 mm-40 mm) per ISO 5579:2013. 

Material Material Density Half-Value Thickness
Aluminum ~2.65 g/cm3 ~1.100 in (27.0 mm)
Steel ~7.80 g/cm3 ~0.315 in (8.0 mm)
Lead ~11.34 g/cm3 ~0.039 in (1.0 mm)
Tungsten ~17.80 g/cm3 ~0.032 in (0.8 mm)

Se-75 Key Specifications

QSA Global, Inc.’s Se-75 radioisotope sources are ideal for controlling the size of the exclusion zone during radiographic exposures at congested work sites. Se-75 radioisotope sources are used on off shore oil rigs and at power generation plants during outages to reduce non-occupational worker exposure.

Gamma Energy Range 66-401 keV
Steel Thickness 0.20 in-1.57 in (5 mm-40 mm)
Aluminum / Titanium 1.4 in-4.7 in (35 mm-120 mm)
Selenium-75 Half-Life 120 days
Special Form Certifications IAEA Certificate USA/0335/S-96
IAEA Certificate USA/0502/S-96

Compatible Gamma-Ray Source Projectors

Your Se-75 sealed sources are engineered to seamlessly integrate with the following  gamma-ray source projectors to ensure safe, reliable operation.
1075 SCARPro

1075 SCARPro

Best for minimal exclusion zones in confined spaces near trades and sensitive equipment.
Assembly A425-6
Max Activity 81 Ci (3.00 TBq)
Special Form View Certificate
880 Series Gold Delta Gamma Camera

880 Series Delta

The most preferred gamma-ray source projector on the market.

Assembly A424-25W
Max Activity 150 Ci (5.55 TBq)
Special Form View Certificate
880 Series Elite Blue Gamma Camera

880 Series Elite

Ideal for use with low-energy isotopes and lower activity.
Assembly A424-25W
Max Activity 150 Ci (5.55 TBq)
Special Form View Certificate
880 Series Omega Red

880 Series Omega

Best suited for offshore applications and countries with strict regulations.
Assembly A424-25W
Max Activity 80 Ci (3.00 TBq)
Special Form View Certificate

989M SCAR

Specifically designed for small controlled area radiography (SCAR).
Assembly X540/1
Max Activity 81 Ci (3 TBq)
Special Form View Certificate

989 "Baby" SCAR

Specifically designed for small controlled area radiography (SCAR).
Assembly X540/1
Max Activity 20 Ci (740 GBq)
Special Form View Certificate

Se- 75 Transportation & Loading

Transporting Se-75

QSA Global, Inc. distributes Se-75 sealed sources worldwide by utilizing the industry’s largest fleet of source changers.  Source changers are available to deliver a single source up to ten sources in a container for device reloads at your facility or at one of QSA Global, Inc.'s authorized service centers.

Loading & Unloading

QSA Global, Inc. offers a variety of options for Se-75 source changes to minimize downtime of your assets.  QSA Global, Inc. and our authorized distributors can reload your Se-75 device at local facilities around the world by trained technicians or sources can be delivered directly to your facility for reload by your trained technicians.

Explore More About Our Sealed Sources

    Ready to Order?

    QSA Global, Inc.'s Se-75 sealed sources come in a range of focal sizes and activities.  Our multi-disciplined technical experts will help you select the optimal configuration for your gamma radiography needs.  

    Request Sources

    Se-75 Disposition.

    Radioactive materials that are no longer required must be transferred to a licensed recipient for final disposition. QSA Global, Inc. provides a one for one exchange on Se-75 sealed radioisotope sources. 

    Request Disposition