Characterization and pulse-shape discrimination of a multi-stacked structure of ZnS: Ag/PMMA for fast-neutron detection in high-flux environments
| Autor: | Priyarshini Ghosh, Douglas S. McGregor, Diego Laramore |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Nuclear and High Energy Physics 010308 nuclear & particles physics business.industry Astrophysics::High Energy Astrophysical Phenomena Detector Gamma ray Phosphor 02 engineering and technology Scintillator 021001 nanoscience & nanotechnology 01 natural sciences Signal Optics 0103 physical sciences Neutron detection Neutron Nuclear Experiment 0210 nano-technology business Instrumentation Sensitivity (electronics) |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 984:164496 |
| ISSN: | 0168-9002 |
| DOI: | 10.1016/j.nima.2020.164496 |
| Popis: | The Micro-Layered Fast Neutron Detector (MLFD) is a proton-recoil scintillator that incorporates the basic concept of a Hornyak button detector with an improved design using a layered structure of ZnS:Ag and PMMA (polymethyl methacrylate). The MLFD was predicted to have low sensitivity to gamma rays, hence pulse shape discrimination was performed to determine the gamma-ray contribution. Presented in this paper are the pulse-shape discrimination characteristics of the MLFD. The charge integration technique was employed to discriminate between the neutrons and gamma rays using a fast digitzer. The MLFD was found to exhibit excellent neutron/gamma-ray discrimination, with the highest Figure-of-Merit (FoM) being 4.56. With PSD, the neutron signal is distinct from gamma-ray, Ĉerenkov and electronic noise signals. This clear separation was achieved due to the large differences in decay times of the neutron and gamma-ray-induced pulses in the ZnS:Ag phosphor. The MLFD can be employed in high gamma-ray exposure fields, up to at least 1287.7 mR/hr, without appreciable degradation in PSD performance. |
| Databáze: | OpenAIRE |
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