Beta-spectrometer with Si-detectors for the study of 144Ce–144Pr decays Alexeev, I.E.; Bakhlanov, S.V.; Bazlov, N.V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2018, Volume:
890
Journal Article
Peer reviewed
Here we present the specifications of a newly developed beta-spectrometer, based on full absorption Si(Li) detector and thin transmission detector, allowing one to perform efficient separation ...beta-radiation and accompanying X-rays and gamma radiation. Our method is based on registration of coincident events from both detectors. The spectrometer can be used for precision measurements of various beta-spectra, namely for the beta-spectrum shape study of 144Pr, which is considered to be an advantageous anti-neutrino source for sterile neutrino searches.
Numerical simulations of charge trapping in germanium strip detectors Boggs, Steven E.; Pike, Sean N.; Roberts, Jarred ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
December 2023, 2023-12-00, Volume:
1057
Journal Article
Peer reviewed
Open access
Charge trapping in germanium detectors will inevitably impact their excellent spectral performance. Disordered regions in the germanium crystal structure, either created in the material during ...processing or induced by radiation exposure, will affect the Charge Collection Efficiency (CCE), degrading the spectral resolution. Here we present numerical simulations of charge trapping effects on the anode and cathode signals for cross-strip germanium detectors. We discuss the assumptions behind our model of trapping, which accounts for both the drift length and thermal motion of the charge carriers. We present simulated CCE curves as a function of interaction depth within the detectors, and develop a technique for benchmarking these simulations against measured data. Comparison with measured CCE curves are presented. We are developing these numerical models with a goal of characterizing, and ultimately correcting, the effects of radiation damage on the spectral resolution of germanium cross-strip detectors.
Wide-bandgap semiconductor-based fast neutron detectors such as silicon carbide (SiC) seem to be a promising concept to meet the implementation requirements as well as the performance specifications ...for fusion and fission environments such as radiation hardness as well as thermal and mechanical stabilities. Beyond the problem of integration of the device in constrained environments, the issue of the quantitative response of the device in a mixed radiation field must be addressed. Therefore, the characterisation of the detector performances, according to the energy of the neutrons is a key first step needed for neutron detection and monitoring in mixed radiation environments with high levels of gammas and fast and thermal neutron fluxes emissions at large energy scales. This paper presents the interpretation of 14.1 MeV neutron measurements using a numerical model developed with the GEANT4 MonteCarlo transport code. The methodology used for a first attempt to estimate the fluence rate of incident neutrons is exposed and a calculation versus experiment ratio is determined.
We present measurements of electron and hole trapping in three COSI germanium cross-strip detectors. By characterizing the relative charge collection efficiency (CCE) as a function of interaction ...depth, we show that intrinsic trapping of both electrons and holes have significant effects on the spectroscopic performance of the detectors. We find that both the electron and hole trapping vary from detector to detector, demonstrating the need for empirical trapping measurements and corrections. Using our measurements of charge trapping, we develop a continuous depth-dependent second-order energy correction procedure. We show that applying this empirical trapping correction produces significant improvements to spectral resolution and to the accuracy of the energy reconstruction.
4π spectrometer of β-decay electrons with Si(Li)-detectors Alekseev, I.E.; Bakhlanov, S.V.; Bazlov, N.V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
June 2023, Volume:
1051
Journal Article
Peer reviewed
We present a description of the originally developed β-spectrometer consisting of two Si(Li)-detectors with sensitive area thickness above 8 mm and 4π-geometry. The full absorption spectrometer ...allows for direct measurements of β-spectra, disregarding the corrections to response function induced by the electron backscattering from the crystal surface. In case of β-spectra of transitions to the excited state of the daughter isotope additional 3″ BGO-detector is used in order to detect the γ-quanta in coincidence with the pair of Si(Li)-spectrometers.
The features of spectrum formation in CdTe (CdZnTe) detectors under gamma quanta radiation are presented. The main characteristics of a semiconductor detector, i.e. the energy resolution and the ...registration efficiency, are determined. The results can be used as a basis for physical and mathematical models of operation of CdTe (CdZnTe) semiconductor detectors for registration of gamma- and x-ray radiation over a wide energy range.
A custom CMOS image sensor hardened by design is characterized in a transmission electron microscope, with the aim to extract basic parameters such as the quantum efficiency, the modulation transfer ...function and finally the detective quantum efficiency. In parallel, a new methodology based on the combination of Monte Carlo simulation of electron distributions and TCAD simulations is proposed and performed on the same detector, and for the first time the basic parameters of a direct CMOS electron detector are extracted thanks to the TCAD. The methodology is validated by means of the comparison between experimental and simulation results. This simulation method may be used for the development of future electron detectors.
•Characterization and TCAD simulation of a custom CMOS direct electron detector.•Novel method for extraction of basic parameter such as FTM and QE from TCAD simulation.•Validation of this parameter extraction thanks to measurements.•The proposed simulator can be used for future design of direct electron detector.
In this work, a method to standardize 226Ra solutions with descendants by 4παβ liquid scintillation counting (LSC) has been used. The standardization can be carried out provided that the equilibrium ...state of 226Ra solutions, the counting efficiency of short-lived 214Po and/or the counter dead time are known. Procedures to obtain these requirements have been set up.
•A method to standardize 226Ra with its progeny in aqueous solutions by 4παβ liquid scintillation counting (LSC) has been applied.•Methods to obtain the age of the solution and the counting efficiency of short-lived 214Po have been set up.•The methodology followed for the standardization of 226Ra solutions has been validated.
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