Imaging of low Z masked with high Z (Pb, U) materials using 14 MeV neutron

• Published in: Journal of instrumentation Vol. 19; no. 5; p. P05022
• Main Authors: Bishnoi, Saroj, Patel, Tarun, Sarkar, P.S., Pant, L.M.
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.05.2024
• Subjects: Accelerator Applications; Fast neutrons; Hole size; Image acquisition; Image contrast; Inspection with neutrons; Neutron radiography; Neutrons; Scintillation counters; Systems design; Zinc sulfide
• ISSN: 1748-0221; 1748-0221
• DOI: 10.1088/1748-0221/19/05/P05022

Abstract An experimental study has been performed using 14 MeV neutrons for imaging of low Z material (particularly composed of C, H, O elements) masked with thick layers of dense and high Z materials. The experimental setup consists of a D-T neutron generator, a metallic collimator and an imaging system. The imaging system is designed with a polypropylene zinc sulphide scintillator screen integrated with a lens coupled 16-bit ICCD camera. Imaging capability of the system was investigated using iron test samples with holes and line pair features. The minimum hole size of 2 mm could be imaged at a contrast of 36% and a line of 2 mm width visible at a contrast of 24% indicating the system's resolution of ∼ mm. Low Z samples such as water (H 2 O) and polyethylene (C 2 H 2 ) n placed behind thick layers of Pb (40 mm) and Uranium (35 mm), were imaged successfully. These images reveal the system's ability towards low Z material imaging in the presence of heavier metals. Good contrast images acquired at a lower neutron yield of ∼ 5 × 10 8 n/sec of D-T neutron generator has provided a possibility to realise fast neutron imaging having moderate resolution (∼ mm) with a smaller footprint and an economical system design for field applications.