Coloration of Glasses Induced by Space Ionizing Radiation

doi:10.3724/SP.J.1077.2012.00411

Abstract

Abstract:

The optical stabilities of several glasses (K9-HL glass, JGS3 silica glass, K509 glass and JGS1 silica glass) under conditions of ionizing radiation (proton flux, electron flux) were studied. Additionally, using the simulation results of space ionizing radiation by SPENVIS and CRÈME-MC, optical lives of these four glasses serving in a given orbital (perigee 350 km, apogee 425 km, orbital inclination 51.6^o) were analysed. It can be found that being used for more than 10 years in this given orbital, the optical transmission of the K9-HL glass evidently decreased, while the optical transmission of the other three glasses (JGS3 silica glass, K509 glass and JGS1 silica glass) didn’t change or changed a little and they can serve as good optical materials in the given space orbital. Because most of the space particles (ionizing radiation) can be effectively inhibited or absorbed in some penetration depth of the glass, the space ionizing radiation can only color a surface layer of the glass, as a result, an anti-radiation glass layer can be put outside the window of a long duration spacecraft in order to reduce ionizing irradiation, and the layer can be made of silica glass.

Key words: glass, space ionizing radiation, absorbed dose, coloration

CLC Number:

TB321

DU Ji-Shi, WU Jie-Hua, ZHAO Li-Li, SONG Li-Xin. Coloration of Glasses Induced by Space Ionizing Radiation[J]. Journal of Inorganic Materials, 2012, 27(4): 411-416.

Figures/Tables 9

Fig. 1 Transmission of K9-HL glass, JGS3 silica glass before and after 10 MeV proton irradiation (Thickness: 10 mm)

Fig. 2 Transmission of K9-HL glass, JGS3 silica glass before and after 4×1012 electron/cm2 1.85 MeV electron irradiation (Thickness: 10 mm)

Fig. 3 Transmission Spectra of K509 glass, JGS1 silica glass before and after 1012 proton/cm2 10 MeV proton or 4×1012 electron/cm2 1.85 MeV electron irradiation

Fig. 4 Picture of the K9-HL glass’s cross section which was irradiated by 4×1012 electron/cm2 1.85 MeV electron

Fig. 5 Particles’ omnidirectional fluence rate in the orbital of perigee 350 km, apogee 425 km, orbital inclination 51.6o

Table 1 Measured to predicted electron absorbed dose ratio based on satellite data and AE8 trapped electron model[12-13]

Inclination /(o)	Altitude /km	Measured/AE8
<40	<750	2-10, or larger
<40	750-2000	2-10
>40	300-750	0.5-1.5
>40	750-2000	1-2

Fig. 6 MULASSIS simulated absorbed dose curves of 1012 proton/cm2 10 MeV proton, 20-year trapped proton in the given orbital, 4×1012 electron/cm2 1.85 MeV electron and 20-years trapped electron in the given orbital with depth in the silica glass

Fig. 7 MULASSIS simulated fluence rates of trapped particles after 10 mm silica glass shielding

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