Company lists · Data refreshed September 2026
Top 25 Nuclear instrumentation software companies based in the United States
RevenueBase identified 122 nuclear instrumentation software companies headquartered in the United States as of September 2026 and tracks 13,250 professional contacts across them, including 796 with verified work emails and 4,680 with mobile numbers. Oak Ridge is the largest hub.
This list covers nuclear instrumentation software companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest nuclear instrumentation software companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Westinghouse Electric CompanyPartial evidence | 10,898 | |||
“Westinghouse Electric Company is the world's leading supplier of safe and innovative nuclear technology.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 404 | ||||
“GSE Solutions supports nuclear power and clean-energy fleets worldwide through integrated engineering services and software that strengthen operational performance.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | Paragon Energy SolutionsPartial evidence | 234 | |||
“Paragon tackles the most difficult challenges of the nuclear industry-those faced by the current operating fleet as well as the next generation of advanced reactors.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 204 | ||||
“The OEM segment of Catalyst MedTech's Equipment Solution division features the Digirad brand of Nuclear Medicine imaging systems.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | Fluke Health SolutionsIndirect evidence | 177 | |||
“Keeping life’s critical devices ready to go at a moment’s notice.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | Reuter-StokesIndirect evidence | 103 | |||
“Reuter-Stokes is an energy technology company that designs and manufactures sensors for power generation.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | Ludlum Measurements, INCIndirect evidence | 80 | |||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | Rmd, A Dynasil CompanyStrong evidence | 72 | |||
“Radiation Monitoring Devices, Inc.(RMD) is among the foremost experts in the fields of radiation detection and imaging, nuclear instrumentation, and non-destructive test equipment.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | Technology For Energy CorpIndirect evidence | 47 | |||
“TEC is an employee-owned company based in Knoxville, Tennessee, USA, that designs and manufactures diagnostic instruments for four diverse industries.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 42 | ||||
“Analysis and Measurement Services Corporation (AMS) is a nuclear engineering consulting firm and recognized market leader in providing the worldwide nuclear power industry with…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | Master-Lee Energy Services CorporationPartial evidence | 38 | |||
“Established in 1987, Master-Lee Energy Services was founded to provide the commercial Nuclear Power Industry with engineering, reactor services, decontamination, Reactor Coolant…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | H3d, INCIndirect evidence | 38 | |||
“H3D offers the world's highest-performance imaging spectrometers.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | RBM Services, LLCPartial evidence | 34 | |||
“RbM Services, LLC has been manufacturing nuclear medical devices in East Tennessee for more than twenty years.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | Wmg, INCIndirect evidence | 33 | |||
“Founded in 1979 and now an EnergySolutions company, WMG, Inc.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | Studsvik ScandpowerStrong evidence | 32 | |||
“Studsvik Scandpower Group is a subsidiary of Studsvik AB (STO:SVIK), and specializes in nuclear engineering simulation software that enables nuclear engineers to design nuclear…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 29 | ||||
“Manufacturer of Test, Measurement, Nuclear and Life Sciences instrumentation.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 24 | ||||
“At Eichrom Technologies, we help our customers in nuclear industries to change the way they think.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | NuclearnPartial evidence | 23 | |||
“With over 60 reactors around the world relying on our technology, Nuclearn is built on one simple idea: nuclear deserves better tools.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | Spectral Labs IncorporatedIndirect evidence | 22 | |||
“Develop and manufacture safety and security instruments for Defense and Commercial applications.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | Hopewell Designs, INCPartial evidence | 20 | |||
“Hopewell Designs Inc provides automated and manual calibration irradiator systems and radiation shielding for government laboratories, nuclear power plants, private industry…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Mirion Technologies Rados OYPartial evidence | 19 | |||
“Mirion Technologies is a global provider of radiation detection, measurement, analysis and monitoring products and services to the nuclear power, medical, military and homeland…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | Nutherm International, INCIndirect evidence | 19 | |||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | Lnd, IncorporatedPartial evidence | 18 | |||
“LND, Incorporated designs, engineers and manufactures gas-filled nuclear radiation detectors.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | Pkmj Technical Services, INCPartial evidence | 14 | |||
“PKMJ is an organization of experienced personnel dedicated to supporting the Nuclear Power Industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Prime Technology, LLCPartial evidence | 12 | |||
“Prime Technology is a small business specializing in electronic instrumentation and measurement systems.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 122 nuclear instrumentation software companies based in the United States
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Nuclear instrumentation software companies based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among nuclear instrumentation software companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “nuclear instrumentation software companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among nuclear instrumentation software companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 796 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 5, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
How many nuclear instrumentation software companies are there based in the United States?
RevenueBase identified 122 nuclear instrumentation software companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Westinghouse Electric Company, headquartered in Cranberry Township, tops this list with the largest team on record.
Which city has the most nuclear instrumentation software companies?
Oak Ridge leads with 6 headquartered companies, followed by Houston (3) and Knoxville (3).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 796 verified decision-maker contacts tracked across these 122 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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