DUAL ENTRANCE WINDOW ION CHAMBER FOR MEASURING X-RAY EXPOSURE

摘要

A dual entrance window ion chamber is provided forpurposes of measuring x-ray exposure. The ion chamberincludes a housing having a cavity formed therein and whichdefines an ion chamber. The housing has oppositelydisposed first and second openings therein located onopposite sides of the chamber. First and second x-rayentrance windows respectively cover the first and secondopenings for permitting entrance of x-rays into thechamber. A collector is located in the chamberintermediate the first and second windows for collection ofelectrons for use in measuring x-ray exposure. The firstand second windows are constructed differently from eachother such that the first window is optimized so that theion chamber provides a relatively flat energy response tox-rays over a first x-ray energy range. The second windowis optimized so that the ion chamber provides a relativelyflat energy response over a second x-ray energy range. Thesecond energy range is of a greater energy level than thatof the first energy range.