- Alexander Vacuum Research, Inc.
 - Specialising in aluminized plastic films 1.5 microns to 2 mill in thickness, and window assemblies for alpha and Beta radiation detection instruments.  BNFL Instruments Ltd
- Specialises in measurement and characterization of radioactive materials.- Colutron Research Corporation
- Manufactures ion sources and related components as well as high resolution X-ray, ion, electron and neutral beam imaging equipment.
- Dehnel Consulting Ltd.
- Areas of expertise include charged particle transport systems and axial injection systems for cyclotrons.
- Detector Technology, Inc.
- Manufacturer of channel electron multipliers.
- FAST ComTec
- Photon counters, multichannel analyzers, multiparameter multichannel analyzers, time-of-flight, multiscalers, nuclear instrumentation, waveform digitizers, transient recorders, Moessbauer systems.
- KEL Aerospace
- Ionospheric monitoring systems for analysing the structure and dynamics of the ionosphere and for support of real-time HF communications and surveillance.
- LeCroy Corporation@
- Microtrac Particle Analyzers
- Designs and manufactures particle size analyzers utilizing laser diffraction. Includes laser light scattering and CCD technology.
- RISMED Oncology Systems
- Sells pre-owned linear accelerators, simulators, CT simulators, Linac parts, and radiation therapy products. Offers worldwide marketing and installations.
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