X-RAY-DETECTORS BASED ON MULTIWIRE PROPORTIONAL CHAMBERS

The multiwire proportional chamber (MWPC), operating in a direct photo n-counting mode, is used as the basis of 1D and 2D X-ray detectors. Th e 1D detector used in our scanning radiographic systems is serially pr oduced. Its counting rate is about 200 MHz, its spatial resolution 0.6 mm, the number of channels is 640, The 2D detector, designed for diff raction structural researches on synchrotron radiation at the storage ring VEPP-3, is being commissioned now. Its characteristics are: 5 MHz , 1.5 mm, 65536 channels. The second 1D detector (10 MHz, 75 mu m, 330 0 channels, sigma = 150 mu m) is made for the same purposes. A third 1 D detector with a registration angle of 60 degrees (500 MHz, 0.6 mm, 1 900 channels) is under development. All the detectors operate in a fra me-by-frame mode and are free (except 2D) of parallax error.