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About Us

In today's confusing regulatory environment, maintaining compliance can be a constant headache and a fiscal drain for businesses that use radioactive materials. You can count on Thomas Gray & Associates, Inc. (TGA) to guide you through the maze and ensure your radioactive materials license, management, and disposal programs are designed and conducted in a responsible, professional, and fully-compliant manner.


Founded in 1970, TGA provides radioactive, hazardous, and mixed waste packaging, brokerage, processing, transportation and disposal services nationwide. We have successfully managed our customers’ service and waste disposal needs for over 50 years, maintaining contracts with private, public, and government institutions nationwide. Our clients include educational institutions, hospitals, research facilities, radiopharmaceutical firms, and other industry generators.


Fully permitted and licensed to operate in the United States, TGA offers complete logistics management with strict compliance of local, state, and federal laws and regulations. Our regulatory compliance record is exemplary, and we will help you ensure that your liability and exposure is limited.

We understand how difficult it can be to understand, and be in compliance with, all local and federal laws. That's why, at TGA, we strive to make things as simple as possible for our customers. TGA, along with our two wholly owned subsidiaries, offer many services for our clients.  On-site Health Physics services, radioactive source leak testing, regulatory permit acquisition, transportation and disposal services, and many more!

Email us for a quote today!


Our Team

Richard Gallego


Grant MacDowall

Primary Broker/Assistant Manager/ARSO


Harold Sims

Director of Transportation


Morgan Razghandi




James De Zetter - 510.643.8765

University of California, Berkeley


Keith Carsten - 520.626.5469

University of Arizona

Cary Renquist - 661.309.1033

Eckert & Ziegler Isotope Products


Joseph Tessari - 970.491.3928

Colorado State University

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