Additive manufacturing of inorganic scintillator-based particle detectors

Inorganic scintillators are widely used for scientific, industrial and medical applications. The development of 3D printing with inorganic scintillators would allow fast creation of detector prototypes for registration of ionizing radiation, such as alpha and beta, gamma particles in thin layers of active material and soft X-ray radiation. This article reports on the technical work and scientific achievements that aimed at developing a new inorganic scintillation filament to be used for the 3D printing of composite scintillator materials: study and definition of the scintillator composition; development of the methods for the inorganic scintillator filament production and further implementation in the available 3D printing technologies; study of impact of the different 3D printing modes on the material scintillation characteristics. Also, 3D printed scintillators can be used for creation of combined detectors for high-energy physics.Comment: 14 pages, 16 figure

Radioluminescence of color centers in LiF crystals

Luminescence of color centers in the near-infrared region under cathode beam excitation is revealed for the first time in as-grown pure LiF and LiF:Mg,O crystals. Emission efficiency of View the MathML sourceF2+, View the MathML sourceF3− and View the MathML sourceF2−centers is higher for the samples enriched by oxygen and magnesium than for ultrapure crystals. The intensity of the NIR luminescence remains practically constant with the increase of the electron beam density. In contrast, visible emission typical for View the MathML sourceF3+and F2 centers is suppressed due to the induced absorption bands. It is assumed that the high-density electronic irradiation leads to the strongly pronounced thermal- and radiation-stimulated diffusion in a relatively thin layer. It causes the association of point radiation defects with the formation of various complex centers and aggregates. Results obtained suggest that LiF crystals can be used for in-situ detection of ionizing radiation

ZnWO₄ luminescent films obtained by hydrothermal method

ZnWO₄ films of 10–20 μm thickness can be produced by hydrothermal synthesis method without additional subsequent treatment. The data obtained show that films possess wolframite structure and demonstrate luminescent properties which are similar to bulk ZnWO₄

Growth and luminescent properties of new Eu 2+^{2+} doped RbBa2_{2}I5_{5} scintillator

A novel crystal scintillator of RbBa$_{2}$I$_{5}$:Eu$^{2+}$ was grown by the Bridgman–Stockbarger method. Its luminescence and scintillation properties were investigated. Under X-ray excitation, the crystal demonstrates blue luminescence peaking at 436 nm associated with 4f$^{6}$5d$^{1}$ → 4f$^{7}$ radiative transitions of Eu$^{2+}$ ions. The main X-ray luminescence decay constant is 800 ns. The light output of RbBa$_{2}$I$_{5}$:3%Eu$^{2+}$ sample under 662 keV excitation is 58,200 ph/MeV

ZnWO4_4 grains characterisation for GRAiNITA – a new-generation calorimeter

International audienc

Fast ultradense GdTa1-xNbxO4 scintillator crystals

International audienc

ZnWO4_4 grains characterisation for GRAiNITA – a new-generation calorimeter

International audienc

ZnWO4 grains characterisation for GRAiNITA – a new-generation calorimeter

We will present the detection properties of ZnWO4 grains for GRAiNITA, a next-generation calorimeter based on the use of scintillator grains.With GRAiNITA, we propose the concept of a new version of the shashlik calorimeter: instead of using successive layers of scintillator and absorber we suggest to use sub millimetric (0.5-1 mm) grains of high-Z and high-density inorganic scintillator in a bath of transparent high-density liquid, as absorber. As in a conventional shashlik detector, the scintillation light is collected towards the photodetector by means of wavelength shifting fibers.In the context of high energy physics experiments, at future electron-positron colliders, this new electromagnetic calorimeter will provide extremely fine sampling and therefore the potential to considerably improve the energy resolution for photons.ZnWO4 is an excellent candidate for GRAiNITA since transparent granules of the desired size can be successfully grown with the method of spontaneous crystallization from a flux melt. While the production process is still being optimized, a small quantity of ZnWO4 granules has already been produced by the ISMA.In this communication we will discuss the study of the scintillation properties of ZnWO4 grains, in comparison to two uniform single crystals with size of 1 cm3 and 2x2x4 cm3 that have been grown using the Czochralski method, as the light yield of an inorganic crystal might depend on the particular growing process used to produce them.Furthermore, we will present the outcomes of study of the light propagation and collection in a small volume of ZnWO4 and we will describe the GRAiNITA concept