20-23 October 2019
MLZ Garching
Europe/Berlin timezone

Testing New Fast Neutron Scintillators with a D-T Neutron Generator

23 Oct 2019, 14:15
30m
Radiochemie München RCM

Radiochemie München RCM

Talk Neutron detection Scintillators 2

Speaker

Charles Sosa (Radiation Monitoring Devices)

Description

Prototype scintillator screens were fabricated in various formats and variations, and tested with fast neutrons from a D-T neutron generator at Adelphi Technology in Redwood City, CA. The scintillators were designed with combinations of plastics+scintillator in which the hydrogen in the plastic acts as a converter for the fast neutrons producing a proton recoil reaction to yield photons within the scintillator. Both mixed and layered plastic/scintillators were tested. Mixed scintillators were made with polystyrene and ZnS:Cu, and layered scintillators included polystyrene, HDPE (high density polyethylene), coated with a layer of ZnS:Cu scintillator. The various scintillator samples were lens-coupled to an Andor EMCCD detector for imaging with the D-T neutron source that produces 14.1 MeV neutrons with a neutron output of 10^8 neutrons/second.
The mixed scintillator screens of polystyrene/ ZnS:Cu produced the best results and images could be acquired on the time scale of minutes with scintillators on the order of 3 mm thick. Imaging performance was similar to Tritec PP/ZnS screens that were included for comparison. Of the layered scintillators, 3 mm polystyrene and 100 micron ZnS:Cu produced the best results. The complete imaging results will be presented. GEANT 4 simulations were also performed to optimize the thickness of conversion and scintillator layers.

Primary authors

Stuart Miller (Radiation Monitoring Devices) Gary Markosyan (Radiation Monitoring Devices) Megan Wart (Radiation Monitoring Devices) Charles Sosa (Radiation Monitoring Devices) Conner Brown (Radiation Monitoring Devices) Vivek Nagarkar (Radiation Monitoring Devices)

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