Fabricant D G, Goddard R E, Harnden F R, Gorenstein P
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, Massachusetts 02138, USA.
Rev Sci Instrum. 1979 Jun;50(6):727. doi: 10.1063/1.1135908.
Lexan coatings on polypropylene windows can eliminate the UV sensitivity of soft x-ray proportional counters. A method is described for coating thin polypropylene films by dipping into and withdrawing from a volatile solution containing Lexan. The x-ray absorption of a typical Lexan coating was only 7% at 44 A which is small compared to that of 2 microm of polypropylene. The Lexan coatings are stable against vacuum cycling in an environment of UV irradiation. As an external, far-UV filter up to wavelengths of 2400 A, Lexan-coated polypropylene is an interesting alternative to metallic films, particularly when large area, high x-ray transmission, and strength are important.
聚丙烯窗上的聚碳酸酯涂层可消除软X射线正比计数器对紫外线的敏感性。本文描述了一种通过将薄聚丙烯膜浸入含有聚碳酸酯的挥发性溶液并从中取出进行涂层的方法。典型聚碳酸酯涂层在44埃处的X射线吸收仅为7%，与2微米厚的聚丙烯相比很小。聚碳酸酯涂层在紫外线照射环境下对真空循环稳定。作为一种外部远紫外线滤光片，直至波长2400埃，涂有聚碳酸酯的聚丙烯是金属薄膜的一个有趣替代品，特别是在大面积、高X射线透射率和强度很重要的情况下。
