A. N. Technology

A.N. Technology Ltd., trading as ANTECH, is a specialist nuclear measurement company founded in 1987 and headquartered in Wallingford, Oxfordshire, United Kingdom, with a further operational presence in Arvada, Colorado, USA. Established by Dr. John Mason, a former lecturer at Imperial College London, ANTECH has grown over more than three decades into a globally recognised provider of non-destructive assay (NDA) instrumentation, systems, and measurement services to the nuclear industry. Its customer base spans national laboratories, nuclear decommissioning authorities, government agencies, and commercial nuclear operators across Europe, North America, and beyond.

ANTECH's technical expertise is built on three principal measurement technologies: gamma-ray spectroscopy, neutron detection, and calorimetry. These disciplines are deployed individually or in combination to deliver highly accurate quantification of radioactive materials in bulk or waste form. Gamma-ray spectroscopy underpins passive assay of gamma-emitting isotopes; neutron detection addresses spontaneously fissioning nuclides such as plutonium; and isothermal calorimetry provides definitive mass measurements of heat-generating radionuclides including plutonium and tritium. This multi-modal capability allows ANTECH to tailor measurement strategies to the specific matrix, activity level, and accuracy requirements of each application.

ANTECH designs and manufactures a comprehensive range of NDA instruments and systems. Its gamma scanning portfolio includes the G3250-220 Wide-Range Segmented Gamma Scanner, the G3800 Series Tomographic Gamma Scanners, the G3600 Series Far Field Gamma Monitor, and the G3501 Plutonium Isotopic Spectrometer. For neutron-based assay, the company produces the N2000-2 Network Neutron Counter (NNC) and the N2240 Series Active-Passive Drum Monitors, as well as the N2004/N2006 Passive Neutron Slab Counter and the N2024-220 Drum Decommissioning Piece Monitor. Its thermal measurement line comprises the CD285 Series Isothermal Calorimeters and CD295 Pre-Conditioner, widely used for plutonium and tritium inventory determination. ANTECH also offers the G3107-1000 Soil Measuring and Segregation System (SMSS) for bulk contaminated-material characterisation and the G3400-220 Low Level Waste Segregation and Sentencing System (QED).

Beyond instrument supply, ANTECH provides a suite of measurement services directly to nuclear facilities. Its flagship UDASS (Uranium and plutonium Drum Assay and Sentencing Service) delivers high-accuracy drum assay of both heterogeneous and homogeneous drums, operating in Tomographic Gamma Scan (TGS), Wide-Range Segmented Gamma Scan (WR-SGS), and Dynamic Open Detector (DOD) modes to accommodate a wide range of waste matrices and activity levels. General Waste Measurement Services extend from small-sample analysis to large-object assay. Gamma Camera Surveys using the ANTECH RadSearch Camera provide in-situ spectroscopic gamma assay of facility surfaces and structures. Soil and Rubble Measurement Services characterise bulk materials potentially contaminated with radioactive materials, supporting clearance and free-release decisions. ANTECH has deployed UDASS operationally at Los Alamos National Laboratory (LANL) in New Mexico for the characterisation of legacy transuranic (TRU) waste drums.

ANTECH's segmented gamma scanning analysis is performed using GammaScanPro software and complies with ASTM C1133-03, the Standard Test Method for Non-Destructive Assay by Segmented Passive Gamma-ray Scanning. Transmission-corrected measurements adhere to ASTM C1718. These methods are applied to radioactive waste sentencing in line with national regulatory frameworks including those of the UK Nuclear Decommissioning Authority (NDA) and the US Department of Energy (DOE). The company's research into transportable assay systems for reclassifying transuranic waste to low-level waste — recognised with the ASME Best Oral Paper/Presentation Award at the WM2025 Symposium — reflects ongoing technical engagement with the most demanding current challenges in nuclear waste classification.

ANTECH holds UKAS (United Kingdom Accreditation Service) accreditation as a Testing Laboratory, number 10301, operating under the requirements of IEC/ISO 17025, the international standard for testing and calibration laboratory competence. The company's quality management and environmental management systems are certified to ISO 9001:2015 and ISO 14001:2015 respectively. These independent accreditations assure clients that ANTECH's measurement results are technically sound, metrologically traceable, and defensible for use in regulatory waste classification and sentencing decisions.

ANTECH operates from two locations: its principal facility in Wallingford, Oxfordshire, UK (Unit 5/6 Thames Park, Lester Way, OX10 9TA), and a US office in Arvada, Colorado (7985 Vance Drive, Suite 307). With instrumentation installed and services delivered at nuclear sites across Europe and North America, the company has accumulated extensive field experience spanning decommissioning campaigns, legacy waste recharacterisation, nuclear safeguards verification, and environmental radiological screening of soils and rubble.

For organisations seeking nuclear waste characterisation, radioactive materials inventory management, safeguards measurement, or environmental radiological contamination assessment of bulk materials, ANTECH offers a uniquely integrated capability combining proprietary NDA instrumentation with UKAS-accredited measurement services and more than 35 years of applied nuclear measurement expertise. Recognition from the UK Nuclear Decommissioning Authority as Best Small and Medium-sized Enterprise (2024) and peer recognition at the foremost international nuclear waste management conference (WM2025) further underscore ANTECH's standing as a credible and technically leading partner for demanding nuclear measurement programmes.