Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
NEUTRON MULTIPLICITY DETECTION
AND OTHER UF ADVANCED
SAFEGUARDS CVT CONTRIBUTIONS
Andreas Enqvist and James Baciak
Nuclear Engineering Program
University of Florida, Herbert Wertheim College of Engineering
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
Metal Doped Liquid Scintillator
• Organic liquid scintillation based
• Tin-based dopants for high-Z component
• Improved gamma collection
• Increased energy deposition implications for neutron/gamma discrimination?
• Low-cost mass producible material
2
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
Tin Doped Liquid Scintillator
3
EJ-309 Tin (“original”)Tin (“new”, alternative dyes)
137Cs spectrum powered at 1660V
0 0.2 0.4 0.6 0.8 10
1000
2000
3000
4000
5000
Pulse Height (V)
Counts
All Chans
Channel1
• Small photo-peak behavior shown at
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
Tin Doped Liquid Scintillator
4
Total IntegralT
ail
Inte
gra
l0 2 4 6 8 10 12
0
0.5
1
1.5
2
2.5
3
EJ-309 Tin (“original”)
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
Cosmic Ray Contributions To Neutron Multiplicity
Counting • Large source of multiplicity
background
• Strong MCNP-experiment agreement
• Potential source of semi-isotropic neutrons
• See poster #9 for details
5
Cosmic ray spallation
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
High Throughput Data Processing
• Motivation: Data saturation from γ’s
• Real world application: spent fuel
• Reject pulses in the digitizer, before data transfer
• Using pulse accumulators in SIS3316-DT 16 channel digitizer:
6
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
Algorithm Development and Verification for Aerial
Radiation Measurement Systems• Use pre-existing
knowledge of the world and additional real-time sensor information to augment radiation detection data to aid in detection, localization, and tracking of sources from aerial measurement platforms
7
Multi-Axis
Optical Video
Gamma Spectro-meter
3-D Terrain
Hyper-spectral Material Classes
GPS + Radar
GyroPrior
Survey Data
Detector PhysicsGardiner, et al, PNNL-SA-113710
To be presented at DNP 2015, October 28-31, Santa Fe, NM
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
Algorithm Development and Verification for Aerial
Radiation Measurement Systems• Compare current measurement
to an estimate of the background via ratios of counts in large, possibly overlapping energy regions of interest. (NSCRAD)
• Look for statistically significant deviations from background in selected spectral windows
• Especially useful for low-count spectra, regardless of energy resolution
• Improve alarm thresholds (θ) and lower minimum detectable activity through improved ratio techniques
8
0 1 2 3 4 5 6 7 8 9 100
0.01
0.02
0.03
0.04
0.05
0.06
0.07
Value
PD
F
SCRAD metrics
Chi distribution
SCRAD metrics with injection
Noncentral chi distribution
Normal approximation
𝜃 = 𝑚 − 𝛿𝑑
Gardiner, et al, PNNL-SA-113710To be presented at DNP 2015, October 28-31, Santa Fe, NM
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
CVT Associates & Related Efforts
9
• Pulse analysis methods for deuterated scintillation detectors
• Anisotropic fast neutron-detector interaction models
• Alternative medical isotope production paths (non-HEU/LEU alternative): C-11 production for PET scans
Simplified experimental setup
with a DD-109X generator, a
HPGe detector, and a sample
control handler.
02
46
8
0
2
4
102
104
106
Neutron E
nergy(MeV
)
(b)
Pulse amplitude (MeVee)
Tota
l C
ounts
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
CVT Associates & Related Efforts (Cont’d)
10
• Computer vision & radiological sensor data fusion
• Neutron spectrum unfolding using high-density noble gas detectors
• Organic photodetectors as replacements to PMTs and Si-photodiodes
• BiI3 Gamma-Ray Spectrometers for Enrichment Monitoring
Radiological/3D vision data fusion
Testbed design for organic photodetectors
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
Upcoming Enhancement to UF Research
Capabilities
• LEIDOS SORDS (Stand-Off Radiation Detection System)
• Coded Aperture Imaging• Mobile Research Platform• Potential Research
– Imaging and Detection Algorithms– New Detectors, Electronics, Active
Masks– Image Fusion– Detection Limits– Variety of Nuclear Security, OSI,
Interdiction, Treaty Verification Research
CVT Participants will be given access to this system.
System delivery expected in early 2016Special Thanks to Rich Vojtech of
DHS/DNDO for making this system available to UF
Consortium for Verification Technology: Workshop - October 15th & 16th, 2015
UF Metrics
• 4 students (1 Fellow and 3 Associates) spent summers at national laboratories– Robert Weinmann-Smith at LANL – Multiplicity Counters (LANL –
Martin Swinhoe)– Hannah Gardiner – Aerial Radiation Measurement System Algorithm
Development (PNNL – Mitchell Myjak and Cari Seifert)– Paul Johns and Christopher Greulich – Organic Photodetectors (PNNL –
Warnick Kernan and Mary Bliss)
• Several Posters and Oral Presentations– SCINT 2015– SPIE– INMM– DNP– IEEE– ANS Winter Conference
Papers under preparation for NIMA, Nuclear Technology, and Physical Review
