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Adelphi Technology Inc.
2003 E. Bayshore Road
Redwood City, CA 94063

Tel: +1 (650) 474 2750
Fax: +1 (650) 474 2755
Email: info@adelphitech.com

Detectors

Adelphi Technology Inc. manufactures a range of neutron generators and has been actively engaged in neutron generator applications development for several years. Detector related products include:

  • Liquid Argon large volume detectors
  • Large area scintillation camera
  • Associated Particle Imaging
  • Phoswich detectors for neutron discrimination

Liquid Argon large volume detectors

liquid argon scintillation detector

Liquid Argon Scintillation detector

Adelphi Technology Inc., has developed a liquid argon scintillation detector. These detectors offer a cost effective route to large volume detection. Liquid argon is lower cost and more sensitive than similarly sized plastic or Sodium Iodide detectors. These liquid argon scintillators can be used for detecting neutrons and γ-rays and are now being used by researchers investigating dark matter.
Some properties of Liquid Argon and other detectors:

Property Argon Xenon Nal Plastic
Cost0.0021.50.50.15
Scintillation yield
(number of scintillation
photons/MeV)
40,000 42,000 38,000 10,000
Fast decay time (ns)7 (25% light)4.32303
Slow decay time (ns)1500 (75% light)22 (100% in <22ns)n/an/a
(n,γ) propensityMediumHighHighMedium
Neutron activationMediumHighHighNone

Large area scintillation camera for fast or thermal neutron radiography

liquid argon scintillation detector

Liquid Argon Scintillation detector

Adelphi Technology Inc., has developed a large scintillation camera. A cooled, image intensified CCD camera views a scintillator from within a radiation shielded area. Neutrons and γ-rays cause the large area scintillator to both phosphoresce and fluoresce. This optical signal is intensified by a micro-channel plate and is detected on an imaging array. The software that runs the camera identifies and extracts signals from incident cosmic rays.
The image on the left shows a neutron radiography image of a mobile phone within a purse.

Associated Particle Imaging

Associated Particle ImagingWhen deuterium and tritium atoms fuse on the generator's target, both an alpha particle and a neutron are produced and emitted simultaneously and in opposite directions. The direction of the neutron can be determined by detecting the direction of the alpha particle. A scintillator provides an optical signal to determine the location, and thus direction, of the alpha particle. A small ion beam spot size (< 2 mm) on the target provides ßa precise origin for the neutrons and alphas, which leads to accurate angular resolutions. This generator is ideal for making a mapped image of gamma emission from fast neutron scattering. The combination of neutron, alpha and gamma detection allows for the possibility of the imaging and identification of distant and concealed objects such as contraband and special nuclear materials. Additionally this generator design allows elimination of background noise since the time of every neutron emission event is known.

» See DT108API

Phoswich detectors for γ-rays + fast and thermal neutrons

Adelphi Technology Inc. has a novel phosphor-sandwich “Phoswich” detector which is able to detect and discriminate between γ-rays, fast neutrons and thermal neutrons. The optical signals arising from the sandwich of different scintillator materials are detected by a photomultiplier. Time-of-flight and pulse shape analysis are used to independently measure γ-rays, fast neutrons and thermal neutrons incident upon the scintillators. Furthermore this system may be used to measure neutron energy spectra, with a resolution of approximately 0.2 MeV.

Phoswich detectors