Plastic scintillator enriched Gd-containing nanoparticles

Polystyrene compositions containing GdF₃ nanoparticles stabilized by ammonium di-hexadecyldithiophosphate and fatty aromatic phosphonic acid (C₆H₅-(CH₂)n-PO(OH)₂, n = 1, 2, 3) were obtained. It was shown that the nanoparticles surface modification by fatty aromatic phosphonic acids with high physical-chemical affinity to polystyrene significantly improves the nanoparticles dispersibility in polymer. The plastic scintillators with content of GdF₃ nanoparticles to 5 wt. % without significant loss of the light yield were obtained

Polymer composite based on polystyrene containing GdF₃ nanoparticles

Polymeric polystyrene-based composites containing GdF₃ nanoparticles stabilized by ammonium dihexadecyldithioposhate and β-styrylphosphonic acid were obtained by radical bulk polymerization. Use of a component β-styrylphosphonic acid, capable of copolymerizing with styrene, as a modifier of GdF₃ surface allows to increase substantially the content of GdF₃ nanoparticles in polystyrene plastic scintillator without changing its scintillations properties

Radiation-hard plastic scintillators with 3-hydroxyflavone derivatives

New compositions of radiation-hard plastic scintillators (PS) with content of 3-hydroxyflavone (3HF) derivatives are proposed. It is shown, that the new PS based on polystyrene with these dopants have both the higher radiation hardness and the higher light output, than PS with original 3HF

The plastic scintillator for n/γ-discrimination with alkyl-substituted PPO derivative.

A new polystyrene-based plastic scintillator for pulse shape n/γ-discrimination is obtained by using alkyl-substituted PPO derivative as scintillation dopant. The microhardness and FOM of the new PS is measured. The microhardness is equal to 39 MPa, and FOM on 2 MeVee level is equal 2.12. Also it is established, the new PS has high long-term stability

Synthesis and luminescent properties of CaF₂:Eu²⁺ nanocrystals

The synthesis of CaF₂ nanocryatals activated by Eu²⁺ ions and soluble in nonpolar media is described, their luminescent properties are studied. It is shown that in nanocrystals of this type there are some channels of radiationless energy loss. These losses significantly decrease the quantum yield of luminescence of CaF₂ nanocryatals

The plastic scintillator activated with fluorinated 3-hydroxyflavone

A new radiation-hard plastic scintillator (PS), based on polystyrene and activated with fluorinated 3-hydroxyflavone, is presented. The new scintillator has the light output half-attenuation dose equal to 11 Mrad, which is much more than a similar PS, containing 3-hydroxyflavone. Also, the temporal characteristics of the PS are investigated. The scintillation flash rise time was 0.5 ns, what is much faster than the rise time of conventional PS, equal to about 0.9 ns. Such properties of the new PS are achieved by application of fluorinated 3-hydroxyflavone as an activator

Fast plastic scintillator with the high light yield

A fast plastic scintillator (PS) on combined base, consisting of 60 wt.% polystyrene and 40 wt.% N-tolylcarbazole, is presented. Relatively to known fast PS, in which luminescence quenching method is used to reduce the rise time, the new PS has both as the short scintillation flash rise time (σ = 167 ps), as the high light yield 11040 photon/MeV (79 % relatively to anthracene). Such unique combination of the parameters is reached by introduction, into the PS composition, N-tolylcarbazole - a dopant with the strong electron-donating properties and the low ionization potential