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A new dedicated signal processing system for gamma-ray spectrometers in high power deuterium-tritium plasma scenarios in tokamaks.
Rev Sci Instrum
September 2022
Department of Physics, University of Milan-Bicocca, Milan, ItalyIoffe Institute, St. Petersburg, Russian FederationInstitute for Plasma Science and Technology, CNR, Milan, ItalyLaboratorio Nacional de Fusión, CIEMAT, Madrid, SpainCEA, IRFM, Saint-Paul-lez-Durance, FranceLaboratory for Plasma Physics, ERM/KMS, Brussels, BelgiumCulham Centre for Fusion Energy, United Kingdom Atomic Energy Authority, Abingdon, United KingdomAssociacao EURATOM/IST, Universidade Tecnica de Lisboa, Lisbon, Portugal.
The most performant deuterium-tritium (DT) plasma discharges realized by the Joint European Torus (JET) tokamak in the recent DT campaign have produced neutron yields on the order of 10 n/s. At such high neutron yields, gamma-ray spectroscopy measurements with scintillators are challenging as events from the neutron-induced background often dominate over the signal, leading to a significant fraction of pileup events and instability of the photodetector gain along with the consequent degradation of the reconstructed spectrum. Here, we describe the solutions adopted for the tangential lanthanum bromide spectrometer installed at JET.
View Article and Find Full Text PDFDevelopment of 4πβ(LS)-γ digital coincidence counting system at NIM.
Appl Radiat Isot
October 2022
China Institute of Atomic Energy (CIAE), 102413, Beijing, China. Electronic address:
A new 4πβ(LS)-γ digital coincidence counting (DCC) system has been developed at NIM. The system equipped with a triple-to-double coincidence ratio (TDCR) counter in the β-channel and a NaI(Tl) scintillation detector in the γ-channel. A dedicated DCC software was designed for off-line implementation of 4πβ(LS)-γ coincidence counting method.
View Article and Find Full Text PDFDevelopment of a portable TDCR system at NIM, China.
Appl Radiat Isot
September 2022
National Institute of Metrology, Beijing, 100029, PR China. Electronic address:
In order to meet the demand of on-site measurement for radionuclides, a portable liquid scintillation TDCR system was developed at National Institute of Metrology (NIM), China. The system consists small size TDCR counter for the measurement of liquid scintillation sources, and digital electronics for pulse signal processing. The optical chamber adopts Teflon material with high diffuse reflection efficiency.
View Article and Find Full Text PDFDevelopment of a movable 4πβ(LS)-γ coincidence counting system for activity standardization of β-γ emitters.
Appl Radiat Isot
August 2021
Mokwon University, Doanbuk-ro, Seo-gu, Daejeon, 88, South Korea. Electronic address:
A new movable 3PM-γ coincidence system, based on 4πβ(LS)-γ coincidence counting, for activity measurement of β-γ emitters has been designed at the Korea Research Institute of Standards and Science (KRISS). The system incorporates 3 PM tubes on the plane and two detectors placed above and below the center of the plane. The 3 PM tubes for β-counters in the plane are movable up to 100 mm from a liquid scintillation vial, thus enabling the variation of β-detection efficiencies by a geometrical technique.
View Article and Find Full Text PDFCMOS-coupled NaI scintillation detector for gamma decay measurements.
Rev Sci Instrum
March 2020
Utah Valley Regional Medical Center, Provo, Utah 84602, USA.
We report an all-solid-state gamma-ray scintillation detector comprised of a NaI(Tl) crystal and a scientific-grade CMOS camera. After calibration, this detector exhibits excellent linearity over more than three decades of activity levels ranging from 10 mCi to 400 nCi. Because the detector is not counting pulses, dead-time correction is not required.
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