arXiv subjects

E. K. Lisetskaya

Publications and source records attributed to E. K. Lisetskaya.

4 recordsLinked to original sources

arXiv2002

X-ray multi-energy radiography with scintillator-photodiode detectors

For reconstruction of the spatial structure of many-component objects, it is proposed to use multi-radiography with detection of X-ray by combined detector arrays using detectors of ``scintillator-photodiode'' type. A theoretical model has been developed of multi-energy radiography for thickness measurements of multi-layered systems and systems with defects. Experimental studies of the sensitivity, output signal of various inspection systems based on scintillators $ZnSe(Te)$ and $CsI(Tl)$, and object image reconstruction (with organics and non-ogranics materials singled out) have been carried out.

physics.ins-det↗

arXiv2002

Multi-energy radiography on the basis of "scintillator-photodiode" detectors

For reconstruction of the spatial structure and thicknesses of complex objects and materials, it is proposed to use multi-radiography with detection of X-ray or gamma-radiation by combined detector arrays of scintillator-photodiode type. Experimental studies have been carried out of the energy dependence of sensitivity of dual-energy inspection systems based on scintillators $ZnSe(Te)$ and $CsI(Tl)$.

hep-ex↗

arXiv2002

Scintillator-photodiode type detectors for multi-energy scanning introscopy

Results of experimental studies of detector arrays S-PD (scintillator-photodiode) and PRD (scintillator-photoreceiving device) used for X-ray digital radiography have shown that there exist further possibilities to increase spatial resolution of this system up to 2-3 line pairs per mm. Theoretical analysis and experimental studies show that the two-energy detection method not only allows one to detect organics on the background of metal, but also substantially increases (by 3-5 times) the detection ability of the system as a whole, especially if parameters of the S-PD pair are optimized, in particular, when ZnSe(Te) is used in the low-energy circuit. A possibility to distinguish, in principle, between substances with insignificant differences in atomic number has been theoretically proven -- by transition to multi-energy radiography. 3D-imaging has been realized using S-PD detector arrays.

physics.ins-det↗

arXiv2002

X-Ray Multi-Energy Introscopy Systems with New Semiconductor Scintillators

Theoretical background and data on the ways of practical realization are presented, related to the problem of detection of dangerous organic objects (explosives, drugs, etc.) in the presence of other organic substances with atomic number differing by no more than 20-30%. For this purpose, multi-energy X-ray introscopy is used. It has been shown that the "weakest link" in the existing multi-energy introscopes used for safety inspection and medicine are detectors of ionizing radiation. In particular, critical is the type of scintillator used in the low-energy detection subsystem. Data are presented on design principles and properties of combined detectors based on a new type of semiconductor scintillators (SCS) -- $ZnSe(Te,O)$, with conversion efficiency of 19-22%, afterglow level less then $0.05 %$ after $10 ms$, and radiation stability up to $500 Mrad$. Results are given on the practical use of experimental samples of the low-energy detector subsystem based on the new SCS material in two-energy introscopes of the 4th and 5th generation.

hep-ex↗