Ludlum Measurements
Sweetwater, TX, United StatesFounded 1962Industry
Ludlum Measurements makes radiation survey meters and monitors. CBRNE-relevant work is a primary business line according to its website. It is headquartered in Sweetwater, TX, United States.
What it does
Threats covered
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Profile
Ludlum Measurements designs and manufactures radiation detection instruments, including survey meters, area monitors and portal monitors. It was incorporated on 14 February 1962 in Sweetwater, Texas, by a former employee of another radiation instrument maker, who started in the kitchen of his house.
More profile
The first design became the Model 3 Survey Meter, which the company still lists among its best-selling instruments. Ludlum says its instruments are used for routine personnel and material monitoring, border security and emergency response, and it repairs and calibrates instruments of other makes as well as its own.
It has grown partly through acquisitions: ADIT (photomultiplier tubes) in 1992, Protean Instrument (alpha-beta counting systems, Knoxville) in 2011, Ludlum GmbH in Hamburg, formerly James Fisher Nuclear Hamburg, in 2020, and VPI Technology (Utah) in 2023. A 2015 report by Pacific Northwest National Laboratory describes more than 1,400 portal monitor systems from Ludlum and Leidos deployed on the US border under US Customs and Border Protection, with Ludlum 4500-series monitors forming part of them.
In June 2025 the Department of Veterans Affairs' Southeast Network placed a purchase order worth up to $12,593 for Ludlum radiation survey meters. In October 2025 a distributor reported two new tritium instruments, the Model 3102 series tritium-in-air monitors and the Model 336 tritium in air collector.
Ownership
Independent private; no parent reported to GLEIF (self-reported, not independently corroborated)
Parent: none (GLEIF reporting exception: NO_KNOWN_PERSON)
Sources (6)
- https://ludlums.com/company/about-us
- https://ludlums.com/company/about-us/history
- https://ludlums.com/company/about-us/company-timeline
- https://www.pnnl.gov/main/publications/external/technical_reports/PNNL-24838.pdf
- https://www.highergov.com/contract/36C24725P0844/
- https://lacoonline.com/news/2025/ludlum-product-spotlight-tritium-monitors/
Not verified or not found
- Funding: none reported (privately held).
- Current ownership structure: only a GLEIF self-reported exception, no independent source.
- A 2025 UK Contracts Finder notice for a Model 4530 portal monitor (reported at 108,109 pounds in a search result) could not be opened and is omitted.
- Certifications: none named in the sources read.
- Whether the Ludlum 4500 deployments are still in service: not stated.
Questions
What does Ludlum Measurements do?
Ludlum Measurements makes radiation survey meters and monitors. CBRNE-relevant work is a primary business line according to its website.
Where is Ludlum Measurements based?
HQ (as found): Sweetwater, TX. HQ country: US.
Who owns Ludlum Measurements?
Independent private; no parent reported to GLEIF (self-reported, not independently corroborated). Parent: none (GLEIF reporting exception: NO_KNOWN_PERSON)
Profiles are compiled from public sources and sampled-checked, not fully audited. Last verified 17 October 2026. Report a correction