Ludlum Measurements, Inc. Founded
Ludlum Measurements, Inc. (LMI) is founded by Don Ludlum in Sweetwater, Texas, originally based out of the kitchen of his house. LMI has since expanded throughout Sweetwater.
Model II - First Instrument
The Model II (2, sometimes called the Model 11) was the first ratemeter designed by Don Ludlum.
Model 3
The Model 3 Survey Meter, an improved version of the Model II, is released.
Model 2200
The Model 2200 Scaler-Ratemeter, designed for sample counting, is released.
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Model 177
The Model 177 Benchtop Ratemeter is released.
Model 3503
The Model 3503, LMI's first portal monitor with NaI(Tl) detectors, is released.
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ADIT Electron Tubes
LMI acquired ADIT, a manufacturer of photomultiplier tubes originally based in Fairfield, Connecticut. It was relocated to Sweetwater, Texas and later rebranded as ADIT Electron Tubes.
Model 375
The Model 375 Area Monitor is released.
Model 2241
The Model 2241, LMI's first digital survey meter, is released.
Eljen Technology
Eljen Technology, a manufacturer of organic scintillator products, is founded in Sweetwater, Texas.
Model 3500 Series
The Model 3500 Series, LMI's first portal monitor with plastic scintillation detectors, is released.
West Texas Molding
West Texas Molding, a company specializing in plastic injection molding, is founded in Sweetwater, Texas.
Model 4525 Series
The Model 4525 Series of portal monitors is released.
ET Enterprises, Ltd.
LMI acquired Electron Tubes, a manufacturer of photomultiplier tubes. The company was rebranded as ET Enterprises, Ltd and is currently located in Uxbridge, United Kingdom.
Protean Instrument
LMI acquired Protean Instrument, a manufacturer of high performance alpha-beta sample counting systems based in Knoxville, Tennessee.
Model 26
The Model 26 Frisker is released.
Model 9DP
The Model 9DP, a pressurized ion chamber, is released.
Plowden & Thompson
LMI acquired Plowden & Thompson, a manufacturer of glass and glass products based in Stourbridge, United Kingdom.
Model 3000
The Model 3000 Digital Survey Meter is released.
Ludlum GmbH
LMI acquired James Fisher Nuclear Hamburg, a designer and manufacturer of radiometric contamination and clearance measurement systems based in Hamburg, Germany. The company was rebranded as Ludlum GmbH.
Ludlum Systems
LMI formed Ludlum Systems to be the distributor and service provider for Ludlum Measurements and Ludlum GmbH products in the United Kingdom.
VPI Technology
LMI acquired VPI Technology, a company based in Draper, Utah that designs, develops, prototypes, tests, and manufactures electronic products for various industries.
