The effect of electron and gamma irradiation on the quality of surface and reflection of silver mirror coated by TiO2 and Ta2O5

Khalouie, E; Mirza, B; Jabbari, I; Mirza, B; Zabolian, H

doi:10.18869/acadpub.ijpr.15.4.421

The effect of electron and gamma irradiation on the quality of surface and reflection of silver mirror coated by TiO2 and Ta2O5

Authors

E Khalouie

B Mirza

I Jabbari

B Mirza

H Zabolian

https://doi.org/10.18869/acadpub.ijpr.15.4.421

Abstract

In this study, the effects of gamma and electron radiation on reflectivity of silver mirrors coated by TiO2 and Ta2O5, in the wavelength range 250 to 1100 (nm) has been investigated. The coatings are considered for space applications in LEO orbit at 500 (km) from the earth surface for three-year mission in space. Electron and gamma dose absorbed within the three-year are respectively about 7.5 (KGy) and 0.4 (KGy) in this orbit. To measure the resistance of TiO2, gamma radiation with CO60 irradiation source was applied on the sample in the range from 0.2 to 20 (KGy) including dose 400 (Gy) at the desired height. At the highest dose, 20 (KGy), radiation effects on both samples were compared with each other. The atomic force microscopy was used to investigate the effect of radiation on the quality of samples surface after radiation, and an spectrophotometer was used to measure the samples reflection before and after radiation. The results showed that in spite of very minor surface changes, and color change of the mirror substrate, its reflection remains unchanged with TiO2 and Ta2O5 coatings.

Keywords

radiation effect

electron

gamma

silver mirrors

TiO2 coating

Ta2O5 coating

1. S Baccaro, A Cecilia, I D Sarcina and A PieGari, “Optical Coatin G Behavior under Gamma Irradiation for Space Applications”, Proc. of SPIE, 5494 (2004) 529.
2. E Hacker, P Weibrodt, L Raupach, and H Lauth, “Space Stability Investigation of Optical Coating by Earth- and Space-Based Experiments”, SPIE 2210, Space Optics (1994).
3. S Baccaro, A Cecilia, I Di Sarcina, A PieGari, Nuclear Science, IEEE 52, 5 (2005) 1179.
4. M Fernandez-Rodriguez et al., Thin Solid Films 455-456 (2004) 545.
5. E G Thayer, E L Blansett, and B E N Keeler, “Space Radiation Testing of Thin Film and Multilayer Optical Coatings”, Proc. of SPIE (2009( 7425.
6. T Thomas, and J Wolfe, “UV-Shifted Durable Silver Coating for Astronomical Mirrors”, Proc. SPIE. 4003 (2000) 312.
7. E R Benton and E V Benton, Nucl. Meth. Phys. Res. B 184 (2001) 255.
8. F Spurny, Radiation Physics and Chemistry 61 (2001) 301.
9. B K Ridley, “The Physical Environment,” Ellis Horwood Ltd. (1979).
10. P Beynel, P Maier, and H Schumacher, “Compilation of Radiation Damage Test Data”, part III: Materials used around high-energy accelerators, CERN 82-10 Health and Safety Department, Geneva (1982).
11. D Y Song, W R Sprague, H A Macleod, and M R Jacobson, Applied Optics 24, 28 (1985) 1164.
12. J M Bennett, E J Ashlly, Applied Optics 4, 2 (1965) 221.
13. R F Bunshah et. al., “Deposition Technology for Films and Coatings”, Cnoyes Publications, New Jersey (1982).
14. P Jin, L Miao and S Tanemura, Applied Surface Science 212-213 (2003) 775.
15. S Baccaro, A Cecilia, I Di Sarcina, and A Piegari, IEEE Nuclear and Plasma Sciences Society 52, 5 (2005) 1779.
16. T Thomas and J Wolfe, “Uv-shifted Durable Silver Coating for Astronomical Mirrors”, SPIE 4003, Optical Dasign, Matericals, Fabrication and Maintenance, Volume: 4003UCRL-JC, NO. 136508, (2000).
17. H A Macleod, “Thin Film Optical Filter”, Macmillan, London, U.K (1986).
18. J Ihlemann, J Bekesi, J H Wiele, and P Simon, “Processing of Dielectric Optical Coatings by Nanosecond and Femtosecond UV Laser Ablation”, Hendawi Publishing Corporation Laser Chemistry (2008) 1.