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Pulse-shape discrimination of the new plastic scintillators in neutron–gamma mixed field using fast digitizer card

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JANČÁŘ Aleš KOPECKÝ Zdeněk DRESSLER Jan VEŠKRNA Martin MATĚJ Zdeněk GRANJA C. SOLAR M.

Druh Článek v odborném periodiku
Časopis / Zdroj Radiation Physics and Chemistry
Fakulta / Pracoviště MU

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Citace
WWW http://www.sciencedirect.com.ezproxy.muni.cz/science/article/pii/S0969806X15001759
Doi http://dx.doi.org/10.1016/j.radphyschem.2015.05.007
Obor Jaderná, atomová a molekulová fyzika, urychlovače
Klíčová slova Scintillation detectors; Mono-energetic neutron sources; Pulse-shape discrimination; Figure of merit; Digital-signal processing
Popis Recently invented plastic scintillator EJ-299-33 enables pulse-shape discrimination (PSD) and thus measurement of neutron and photon spectra in mixed fields. In this work we compare the PSD properties of EJ-299-33 plastic and the well-known NE-213 liquid scintillator in monoenergetic neutron fields generated by the Van de Graaff accelerator using the 3H(d, n)4He reaction. Pulses from the scintillators are processed by a newly developed digital measuring system employing the fast digitizer card. This card contains two AD converters connected to the measuring computer via 10 Gbps optical ethernet. The converters operate with a resolution of 12 bits and have two differential inputs with a sampling frequency 1 GHz. The resulting digital channels with different gains are merged into one composite channel with a higher digital resolution in a wide dynamic range of energies. Neutron signals are fully discriminated from gamma signals. Results are presented.

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