Effect of gamma radiation dose rate on the light output of commercial polymer scintillators

Biagtan, E.; Goldberg, Eugene P.; Harmon, Julie P.; Stephens, R. W.

doi:10.1016/0168-583x(94)95478-x

Cited by 15 publications

(3 citation statements)

References 9 publications

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“…In the standard plastic scintillators, the scintillation signal diminishes by more than twice, if the radiation dose is lower than 10 Mrad [13]. This result completely agrees with the data obtained in works [16,19].…”

Section: Organic Crystals Polycrystals Composite and Plastic Scintisupporting

confidence: 89%

“…In the examples presented above, only one of those processes was observed under the action of ionizing radiation, and this process is characteristic of a specific material. For organic scintillators, changes in their luminescence spectra are observed, and those systems are relatively not radiation-resistant (to 0.5 Mrad for organic crystals [13], 10 Mrad for plastic scintillators [13,16,19], and 30 Mrad for scintillators on the basis polydimethyl-co-diphenylsiloxane and polymethylphenyl-co-methylhydrosiloxane [16]). However, if ultralow concentrations of organic luminophore molecules are introduced into those materials, their radiation resistance increases; in particular, in the case of POPOP, to 105-110 Mrad and, in the case of -terphenyl, to not lower than 170 Mrad).…”

Section: Possible Mechanisms Of Radiation-induced Damage To Scintillamentioning

confidence: 99%

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Composite Scintillators and Some Features of Their Radiation Resistance

Krech

Galunov

2017

Ukr. J. Phys.

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COMPOSITE SCINTILLATORS AND SOME FEATURES OF THEIR RADIATION RESISTANCE PACS 42.88.+h, 81.05.Zx, 81.40.Wx Nowadays, composite scintillators find applications in a growing number of tasks dealing with the detection of ionizing radiation. They have several advantages in comparison with other scintillation materials. With the emergence of a new generation of accelerators, the radiation load on detectors is significantly increased. Therefore, the development of materials with high radiation resistance for radiation detectors becomes an important task. We propose to apply composite scintillators as radiation-resistant materials. The most important factor is that irradiation can significantly modify the characteristics of a scintillation material. The aim of this work was to study the specific features of possible radiation-induced damages and transformations in composite scintillators under the action of ionizing radiation. A comparative analysis of the relative light yield, transmittance, and luminescence spectra, as well as their dependences on the accumulated dose, is carried out for various composite scintillators containing grains of organic or inorganic single crystals, such as Gd2SiO5:Ce, Gd2Si2O7:Ce, Al2O3 : Ti, Y2SiO5:Ce, and Y3Al5O12:Ce. Probable mechanisms of radiation-induced changes occurring in scintillators under irradiation are proposed, and the influence of those processes on the radiation resistance of composite scintillators is analyzed. K e y w o r d s: composite scintillators, radiation resistance.

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Section: Organic Crystals Polycrystals Composite and Plastic Scintisupporting

confidence: 89%

Section: Possible Mechanisms Of Radiation-induced Damage To Scintillamentioning

confidence: 99%

Composite Scintillators and Some Features of Their Radiation Resistance

Krech

Galunov

2017

Ukr. J. Phys.

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“…Numerous studies on the effects of radiation on polymer matrices led to a scenario, which explains complicated radiolysis products. − γ irradiation induces the formation of free radicals in the polymer matrix. Polymers formed from 1,1-disubstituted vinyl monomers have a tendency to undergo scission, whereas structures formed from monosubstituted vinyl compounds tend to undergo cross-linking.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Surface Morphology in 2-Hydroxyethyl Methacrylate Copolymer Exposed to γ Radiation

2003

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Buckling patterns were observed on the outer surface of HEMA copolymers irradiated in air and subsequently immersed in solvents. The structure parameters of these buckling patterns on the irradiated copolymers were obtained via image analysis; these parameters include pattern size, pattern uniformity, and undulation amplification. The pattern size increased with time due to the release of elastic constraints and then reached a constant morphology, which persisted upon attaining equilibrium swelling due to a radiation-induced concentration gradient in carboxyl groups along the thickness direction. The pattern size increased as the dose rate decreased. Solution pH also influenced the surface morphology of irradiated samples. Increases in swelling accompanied by increasing the pH of the solvent resulted in patterns with morphologies, which shifted from noodlelike to needlelike grains. All of this is explained by the changes in osmotic pressure and radiation-induced cross-link density gradients along the thickness direction of the samples.

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Transparent chiral polymers for optical applications

Pujari

Kulkarni

Large

et al. 2005

J of Applied Polymer Sci

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Optically active chiral polymers and copolymers of cholesteryl methacrylate have been studied for use in optical applications including plastic optical fibers. Homopolymers of chiral cholesteryl methacrylate with differing molecular weights and copolymers with methyl methacrylate were synthesized by free-radical copolymerization in tetrahydrofuran using azobisisobutyronitrile at 67°C for 26 h. All polymers were characterized for molecular weight, glass-transition temperature, optical rotation, transparency, and refractive index and solution blended to test for compatibility with poly(methyl methacrylate). Such chiral materials are of particular interest because they offer useful polarization properties without requiring bulk orientation of the molecules. This makes it possible to produce low cost optical elements such as circularly birefringent or circularly polarizing optical elements with potential applications in polarization manipulations and sensing. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 58 -65, 2005

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Effect of gamma radiation dose rate on the light output of commercial polymer scintillators

Cited by 15 publications

References 9 publications

Composite Scintillators and Some Features of Their Radiation Resistance

Composite Scintillators and Some Features of Their Radiation Resistance

Evolution of Surface Morphology in 2-Hydroxyethyl Methacrylate Copolymer Exposed to γ Radiation

Transparent chiral polymers for optical applications

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