Fluctuations of Track Structure and Energy Resolution of Scintillators

Gektin, A.; Vasil’ev, A.N.

doi:10.1007/978-3-030-21970-3_3

Cited by 1 publication

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to simulate tracks and decay kinetics, we use the technique [31], [32], [36], which differs from the model of cylindrical track with smooth distribution of excitations along the track, used in [15], [16], and [19]. The selected approach has some limitations since it does not take into account the electric fields originating from the separation of electrons from holes, but it takes into account the microscopic structure of the track, such as clustering of carriers, due to Auger cascade and production of δ-electrons, and allows simulating noncylindrical tracks.…”

Section: Influence Of the Track Structure On The Photopeak Broadementioning

confidence: 99%

“…The calculations were performed for 66 events of 200-keV electron tracks in NaI. Coordinates of electrons and holes after their thermalization were calculated as described in detail in [31], [32], and [36]. First of all, the energy loss functions for NaI were simulated based on EPDL97 database [40] of photoelectron cross sections with corrections of energies of NaI core and valence states in order to reproduce forbidden gap and core band energies in NaI.…”

Section: Influence Of the Track Structure On The Photopeak Broadementioning

confidence: 99%

“…During the past years, the series of works are devoted to deeper investigation of nonuniformity distribution of excitations and their later relaxation depending on different irradiation conditions [31], [32]. It was shown that the nonuniformity of electron densities in the particle tracks is very sensitive to all the stages of electron relaxation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Energy Resolution of Scintillators in Connection With Track Structure

Gektin

Vasil’ev

Суздаль

et al. 2020

IEEE Trans. Nucl. Sci.

View full text Add to dashboard Cite

The large spread of scintillator performance (light yield and energy resolution) from a theoretical limit shows that we are still far from the deep understanding of the phenomena. Usually, extrinsic aspects of resolution degradation (such as purity, defects, stoichiometry, and so on) are the subject of study. At the same time, intrinsic factors (such as track structure, excitation density, and uniformity) that depend on crystal lattice can play a dominant role in scintillator performance. Some progress in the understanding of these problems is achieved by using the concept of different efficiencies of photon emission from excited regions with different concentrations of electronic excitations. The regions with a high or low concentration of thermalized excitations result in the nonradiative losses of excitations and, therefore, produce additional event-to-event fluctuations. The technique of multidimensional analysis of the time-resolved pulse shape is proposed for the clustering of all the events according to the proximity of the waveform to some centroids of the clusters. This procedure shows that even conventional NaI:Tl and CsI:Tl scintillators allow to achieve an energy resolution of about 3% for 662-keV gamma photons.

show abstract