Lexan coating to eliminate the UV sensitivity of soft X-ray proportional counters with a polypropylene window
Abstract
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 Å which is small compared to that of 2 μm 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 Å, Lexan-coated polypropylene is an interesting alternative to metallic films, particularly when large area, high x-ray transmission, and strength are important.
- Publication:
-
Review of Scientific Instruments
- Pub Date:
- June 1979
- DOI:
- 10.1063/1.1135908
- Bibcode:
- 1979RScI...50..727F
- Keywords:
-
- Lexan (Trademark);
- Polypropylene;
- Proportional Counters;
- Ultraviolet Absorption;
- Windows (Intervals);
- X Ray Telescopes;
- Energy Conversion Efficiency;
- Photosensitivity;
- Thermal Control Coatings;
- X Ray Astronomy;
- 07.85.+n;
- 29.30.Kv;
- 81.15.Lm;
- Instrumentation and Photography;
- X- and gamma-ray spectroscopy;
- Liquid phase epitaxy;
- deposition from liquid phases