Thin film CdTe based neutron detectors with high thermal neutron efficiency and gamma rejection for security applications

2016 ◽  
Vol 838 ◽  
pp. 117-123 ◽  
Author(s):  
L. Smith ◽  
J.W. Murphy ◽  
J. Kim ◽  
S. Rozhdestvenskyy ◽  
I. Mejia ◽  
...  
Keyword(s):  
Thin Film ◽  
Thermal Neutron ◽  
Neutron Detectors ◽  
Security Applications

scholarly journals Thin Film Polymer Composite Scintillators for Thermal Neutron Detection

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Andrew N. Mabe ◽  
John D. Auxier ◽  
Matthew J. Urffer ◽  
Stephen A. Young ◽  
Dayakar Penumadu ◽  
...  
Keyword(s):  
Thin Film ◽  
Thermal Neutron ◽  
Gamma Ray ◽  
Detection Efficiency ◽  
Fluorescence Emission ◽  
Neutron Detection ◽  
Fluorescent Sensors ◽  
Neutron Detectors ◽  
Neutron Detection Efficiency ◽  
Film Polymer

Thin film polystyrene composite scintillators containing LiF6 and organic fluors have been fabricated and tested as thermal neutron detectors. Varying fluorescence emission intensities for different compositions are interpreted in terms of the Beer-Lambert law and indicate that the sensitivity of fluorescent sensors can be improved by incorporating transparent particles with refractive index different than that of the polymer matrix. Compositions and thicknesses were varied to optimize the fluorescence and thermal neutron response and to reduce gamma-ray sensitivity. Neutron detection efficiency and neutron/gamma-ray discrimination are reported herein as functions of composition and thickness. Gamma-ray sensitivity is affected largely by changing thickness and unaffected by the amount of LiF6 in the film. The best neutron/gamma-ray discrimination characteristics are obtained for film thicknesses in the range 25–150 μm.

Optimizing diode thickness for thin-film solid state thermal neutron detectors

2012 ◽  
Vol 101 (14) ◽  
pp. 143506 ◽  
Author(s):  
John W. Murphy ◽  
George R. Kunnen ◽  
Israel Mejia ◽  
Manuel A. Quevedo-Lopez ◽  
David Allee ◽  
...  
Keyword(s):  
Thin Film ◽  
Solid State ◽  
Thermal Neutron ◽  
Neutron Detectors

New surface morphology for low stress thin-film-coated thermal neutron detectors

2002 ◽  
Vol 49 (4) ◽  
pp. 1999-2004 ◽  
Author(s):  
D.S. McGregor ◽  
R.T. Klann ◽  
H.K. Gersch ◽  
E. Ariesanti ◽  
J.D. Sanders ◽  
...  
Keyword(s):  
Thin Film ◽  
Surface Morphology ◽  
Thermal Neutron ◽  
Neutron Detectors

scholarly journals Neutron detection devices with 6LiF converter layers

2018 ◽  
Vol 170 ◽  
pp. 01004
Author(s):  
Paolo Finocchiaro ◽  
Luigi Cosentino ◽  
Sergio Lo Meo ◽  
Ralf Nolte ◽  
Desiree Radeck
Keyword(s):  
Thermal Neutron ◽  
Homeland Security ◽  
Spent Nuclear Fuel ◽  
Detection Efficiency ◽  
Industrial Safety ◽  
Silicon Detectors ◽  
Neutron Detectors ◽  
Simulation Code ◽  
Security Applications ◽  
Interim Storage

The demand for new thermal neutron detectors as an alternative to 3He tubes in research, industrial, safety and homeland security applications, is growing. These needs have triggered research and development activities about new generations of thermal neutron detectors, characterized by reasonable efficiency and gamma rejection comparable to 3He tubes. In this paper we show the state of art of a promising lowcost technique, based on commercial solid state silicon detectors coupled with thin neutron converter layers of 6LiF deposited onto carbon fiber substrates. Several configurations were studied with the GEANT4 simulation code, and then calibrated at the PTB Thermal Neutron Calibration Facility. The results show that the measured detection efficiency is well reproduced by the simulations, therefore validating the simulation tool in view of new designs. These neutron detectors have also been tested at neutron beam facilities like ISIS (Rutherford Appleton Laboratory, UK) and n_TOF (CERN) where a few samples are already in operation for beam flux and 2D profile measurements. Forthcoming applications are foreseen for the online monitoring of spent nuclear fuel casks in interim storage sites.

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