Spectral and luminescent characteristics of organic scintillators UPS-923A irradiated with ionizing radiation

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Abstract

The effect of gamma and electron irradiation on optical and IR absorption, as well as on photoluminescence of samples with a PS polystyrene base and pTP and POPOP additives, has been studied. A decrease in the luminescence intensity of irradiated samples in the ranges of 300–380 nm and 380–500 nm was found, which correlates with changes in the IR absorption spectra of the samples, which is due to the degradation of the structure of the aromatic benzene ring in the matrix of the polymer base and the destruction of additives.

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About the authors

Sh. Irisov

Institute of Nuclear Physics, Academy of Sciences of Uzbekistan

Author for correspondence.
Email: izzatilloh@yahoo.com
Uzbekistan, Tashkent

I. Nuritdinov

Institute of Nuclear Physics, Academy of Sciences of Uzbekistan

Email: izzatilloh@yahoo.com
Uzbekistan, Tashkent

K. Kh. Saidahmedov

Institute of Nuclear Physics, Academy of Sciences of Uzbekistan

Email: izzatilloh@yahoo.com
Uzbekistan, Tashkent

Z. U. Esanov

Institute of Nuclear Physics, Academy of Sciences of Uzbekistan

Email: esanov@inp.uz
Uzbekistan, Tashkent

B. S. Yuldashev

Institute of Nuclear Physics, Academy of Sciences of Uzbekistan

Email: esanov@inp.uz

Foreign Member of the RAS, Academician of the AS RUz

Uzbekistan, Tashkent

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2. Fig. 1. Absorption spectra of the initial (1) and irradiated with electrons 1 × 1015 cm–2 (2) and gamma rays at a dose of 107 rad (3) UPS samples (a); difference spectra (b) for 2 and 1 (4), 3 and 1 (5).

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3. Fig. 2. PL spectra excited in the band of 300 nm (a) and 350 nm (b) of the initial (1) electron irradiated with a fluence of 1016 e/cm2 (2) and gamma irradiated with a dose of 107 rad (3).

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4. Fig. 3. Normalized photoluminescence spectra excited at the bands of 300 nm (a) and 350 nm (b) of the initial (1) electron irradiated with a fluence of 1016 e/cm2 (2) and gamma irradiated with a dose of 107 rad (3).

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5. Fig. 4. IR spectra of the initial (1), gamma-irradiated with a dose of 107 rad (2) and electron-irradiated with a fluence of 1016 e/cm2 (3) samples of UPS – 923A (a); differences in spectra 2 and 1 (4), 3 and 1 (5) (b).

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