Fast Neutron Scattering Analysis - University of Cape Town

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Results from a Rotational-Translational scan (a) transmission detector (b) 45° detector (c) 150° detector (H-suppressed) (d) 150° detector (H-enhanced) explosive illicit drug dense cotton clothing
Detection of explosives in airline baggage by FNSA Focus on screening of outgoing baggage – requirements include high throughput and low false alarm rate. Signal: High density region (1.6 – 2.0 g cm -3 ) Appropriate HCNO atom fraction High concentration of HCNO Effective explosive detection systems must offer: (a) Rapid operation (< 20 s per bag) (b) Reliable detection Zero false negative rate (must detect all explosives > 200 g) Small false positive rate (few false alarms) (c) Safe use (d) Ease of use Not clear whether or not the new generation of X-ray systems will fully meet all these requirements.
Page 1: Contraband detection, using neutron
Page 5 and 6: Bombing of Pan Am Flight 103 (Boein
Page 7 and 8: Common approaches to detect hidden
Page 9 and 10: Oxygen concentration (moles cm -3 )
Page 11 and 12: Neutron - based interrogation metho
Page 13 and 14: Thermal neutron capture thermal neu
Page 15 and 16: Fast neutron inelastic scattering m
Page 17 and 18: Neutrons in, neutrons out fast neut
Page 19 and 20: National Accelerator Centre, near C
Page 21 and 22: 1500 mm 300 mm 600 mm 400 mm 310 mm
Page 23 and 24: Pulse height (L) channel 60 40 20 0
Page 27 and 28: θ lab : 150 o 45 o Parameter: Puls
Page 29 and 30: Scattering signatures measured for
Page 31 and 32: The sensitivity of the approach for
Page 33 and 34: P x (x,k) represents the degree to
Page 35 and 36: Ammonium Nitrate Composition B Comp
Page 37 and 38: A group probability function indica
Page 39 and 40: Location of contraband in FNSA meas
Page 41: Results from a Rotational-Translati
Page 46 and 47: Detection of illicit drugs in airli
Page 48 and 49: FNSA screening times per suspect it

Fast Neutron Scattering Analysis - University of Cape Town

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