Reference &
Calibration Sources

The Isotrak™ Product Line is part of Eckert & Ziegler’s ‘Isotope Products Business Segment’ and provides high quality radioactive reference sources and solutions for the checking and calibration of radiation measurement instruments. Van Overeem Nuclear b.v. can help you with finding the right source for reference and calibration purposes. Because of the wide range of sources in this category we kindly ask you to find your source in one of the catalogues.

Reference & </br>Calibration Sources
Industrial Sources

Eckert & Ziegler Isotope Products offers a wide range of sealed radiation sources for industrial measurement and gauging, analytical instruments and mineral / oil well logging applications. In addition to our industry-standard capsule designs, a full custom design and one-off manufacturing service is available.

Get in touch with our Sales Team

If you are in need of any further information regarding sources, please contact us at

We will guarantee you the best service possible on providing information and helping you out with the best choice for your department. We are very experienced with the logistics due to our worldwide network.


Isotope Products Reference & Calibration catalogue


Nuclitec Reference & Calibration catalogue


Analytics Reference & Calibration catalogue


Modular Lab eazy catalogue


Modular Lab eazy cassette catalogue


Synthesizer Comparison catalogue