摘要
利用60Coγ射线对镧火石玻璃和镧冕玻璃进行辐照,研究不同辐照剂量对光学透射率的影响及其在空间光学系统中使用的适应性,辐照总剂量最大达到10 kGy。结果表明:所有玻璃在辐照后可见光透射率都下降了,而在近红外波段仍然保持较高的透射率。尽管镧火石玻璃LaF10平均透射率在辐照前最小,但是辐照后LaF10透射率衰减是所有玻璃中最小的。模拟了8个不同轨道高度地球辐射环境10年累积的总剂量以及经过10 mm铝屏蔽后的累积总剂量。发现对于10年任务期,在3 000、6 000和10 000 km轨道需要增加屏蔽层厚度,而在其他5个轨道,10 mm厚的铝屏蔽可以保证镧系玻璃满足系统对透射率的要求。
A study of the effects of 60Co gamma radiation on the transmission of lanthanum flint and lanthanum crown glasses was presented for application in space optics.The max total dose attained was 10 kGy,and the experimental results show that the visible transmission for all samples decreases,while the near-infrared transmission shows a slight decrease.Although the transmission of the lanthanum flint glass LaF10 is the minimum of all samples before irradiation,it also shows a minimum transmittance loss after irradiation.The total accumulated radiation doses with and without a 10 mm-thick Al shielded layer are simulated for the eight orbits of different altitudes in a 10-year-mission.The simulating results indicate that in 3 000 km,6 000 km and 10 000 km orbit altitudes,a thicker shielded layer is required to reduce the total dose,while in the other five orbits,a 10 mm-thick Al layer is enough for satisfying the optical system performance.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2010年第3期48-50,共3页
Aerospace Materials & Technology
基金
真空低温技术与物理国家级重点实验室基金(9140C5503060802)资助项目
国家高技术研究发展计划(2007AA042431)资助项目
关键词
光学玻璃
电离辐射
辐射诱发透射率衰减
空间环境
Optical glasses
Ionizing radiation
Radiation-induced transmission degradation
Space Environment
