Proof of principle of a high-spatial-resolution, resonant-response γ-ray detector for Gamma Resonance Absorptionin¹⁴N

Abstract

The development of a mm-spatial-resolution, resonant-response detector based on a micrometric glass capillary array filled with liquid scintillator is described. This detector was developed for Gamma Resonance Absorption (GRA) in 14 N. GRA is an automatic-decision radiographic screening technique that combines high radiation penetration (the probe is a 9.17 MeV gamma ray) with very good sensitivity and specificity to nitrogenous explosives.Detailed simulation of the detector response to electrons and protons generated by the 9.17 MeV γ-rays was followed by a proof-of principle experiment, using a mixed γ-ray and neutron source. Towards this, a prototype capillary detector was assembled, including the associated filling and readout systems. Simulations and experimental results indeed show that proton tracks are distinguishable from electron tracks at relevant energies, on the basis of a criterion that combines track length and light intensity per unit length.

An adjustable focusing system for a 2 MeV H−ion beam line based on permanent magnet quadrupoles

“…The accelerator provides a pulsed 1.92 MeV Hion beam at a repetition rate in the range of Hz. The peak current and the pulse width are adjustable in the range (1)(2)(3)(4)(5) mA and (1-25) µm, respectively. In the extraction beam line, beam cross sections between (5 × 5) mm 2 and (50 × 50) mm 2 can be obtained.…”

“…For fixed target experimental activities, a focused beam is desired in order to obtain higher interaction rates on a target. Such a setup enables applications in material analysis such as PIGE/PIXE [2][3][4] and GRNA [5][6][7]. Another interesting option is the use of the envisioned PMQ system for beam transfer lines (BTL), where minimal beam divergence is required instead of minimal beam size.…”

Fast-neutron imaging spectrometer based on liquid scintillator loaded capillaries

“…In 2005 the Soreq, PTB and Bern University collaboration investigated a capillary array of 20 µm in diameter fibres, developed by the CHORUS collaboration at CERN. The capillaries were filled with high-refractive-index liquid scintillator developed at Soreq for a Gamma-ray Resonance Absorption (GRA) detector [8]. The detector was tested with gamma-rays and mixed gamma and neutron events, produced by radioactive sources.…”