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Proton-induced coloring of multicomponent glasses.
Proton radiation causes color changes in Schott glasses used in space telescopes. Absorption increases with dose, with protons causing more long-wavelength absorption than electrons.
Area of Science:
- Materials Science
- Optical Engineering
- Space Science
Background:
- Schott glasses are critical focusing elements in space-based observatories like the International Ultraviolet Explorer.
- Understanding radiation-induced degradation is essential for long-term mission success and instrument reliability.
Purpose of the Study:
- To quantify proton-induced optical absorption in Schott glasses.
- To compare the effects of proton versus electron irradiation on glass optical properties.
- To model the dose-dependent absorption behavior.
Main Methods:
- Irradiation of three Schott glass types with protons across the 280-700 nm spectrum.
- Spectroscopic analysis to determine absorption spectra and band fitting using Gaussian functions.
- Modeling induced absorption (alpha) as a function of proton dose (Phi) using a saturating exponential function.
- Comparison with existing electron irradiation data for the same glasses.
Main Results:
- Proton irradiation induced absorption spectra characterized by four Gaussian bands.
- Induced absorption followed a saturating exponential function up to 10(7) rads.
- Protons and electrons produced absorption bands at similar energies but with different saturation levels.
- Proton irradiation led to higher absorption at longer wavelengths, while electron irradiation dominated shorter wavelengths.
Conclusions:
- Proton radiation significantly alters the optical properties of Schott glasses.
- The observed dose-dependent absorption can be accurately modeled.
- Differential absorption characteristics between proton and electron irradiation have implications for instrument design and radiation shielding in space.
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