Dual entrance window ion chamber for measuring X-ray exposure

Details Dual entrance window ion chamber for measuring X-ray exposure Dual entrance window ion chamber for measuring X-ray exposure

1995-02-01

1996-04-16

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

378 37, 378161, G01T 1185

Patent

active

055085261

ABSTRACT:
A dual entrance window ion chamber is provided for purposes of measuring x-ray exposure. The ion chamber includes a housing having a cavity formed therein and which defines an ion chamber. The housing has oppositely disposed first and second openings therein located on opposite sides of the chamber. First and second x-ray entrance windows respectively cover the first and second openings for permitting entrance of x-rays into the chamber. A collector is located in the chamber intermediate the first and second windows for collection of electrons for use in measuring x-ray exposure. The first and second windows are constructed differently from each other such that the first window is optimized so that the ion chamber provides a relatively flat energy response to x-rays over a first x-ray energy range. The second window is optimized so that the ion chamber provides a relatively flat energy response over a second x-ray energy range. The second energy range is of a greater energy level than that of the first energy range.

REFERENCES:
patent: 3296478 (1967-01-01), Ichinorawa
patent: 4230944 (1980-10-01), Wiegman et al.
patent: 4896041 (1990-01-01), Vlasbloem et al.
patent: 5115134 (1992-05-01), Slowey

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