Fast Neutron Scattering Analysis - University of Cape Town

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Scattering signatures measured for unknown samples are unfolded to determine the elemental composition of the sample: N+ Sn ( ) f R( n) = ∑ 4 i = 1 i i S(n) 200 150 100 50 Hist Data Fit Background 0 0 150 300 450 600 750 900 where: S(n) : scattering signature measured for a sample of unknown composition R i (n) : scattering signatures measured for N individual elements and 4 background components (±∆f i ) : fitting coefficients f i n The atom fraction a i a i for each element in the unknown compound is simply f i = N ∑ i = 1 f i The atom fractions a i ±∆a i uniquely characterize the elemental composition of the scattering sample.
Scattering signatures measured for unknown samples are unfolded to determine the elemental composition of the sample. The measured atom fractions uniquely characterize the elemental composition of the scattering sample. atom fraction 0.8 0.6 0.4 0.2 0.0 Methanol Ammonium Heroin nitrate simulant HCNOAlSFePb HCNOAlSFePb HCNOAlSFePb The identification of specific materials from measured atom fractions can be facilitated by introducing a χ 2 -based screening procedure to compare the atom fractions measured for an “unknown” sample with the known atom fractions of a large set of candidate materials.
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: θ lab : 150 o 45 o Parameter: Puls
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 and 42: Results from a Rotational-Translati
Page 43 and 44: Detection of explosives in airline
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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