| 摘要 |
A detector (64) for detection of ionizing radiation, an apparatus for use in planar beam radiography, comprising such a detector, and a method for detecting ionizing radiation. The detector comprises a chamber filled with a n ionizable gas; first and second electrode arrangements (2, 1, 18, 19) provid ed in said chamber with a space between them, said space including a conversion volume (13); means for electron avalanche amplification (17) arranged in sai d chamber; and at least one arrangement of read-out elements (15) for detectio n of electron avalanches. A radiation entrance is provided so that radiation enters the conversion volume between the first and second electrode arrangements. In order to achieve well-defined avalanches the means for electron avalanche amplification includes a plurality of avalanche regions. The detector, apparatus and method is advantageous since it prevents the formation of harmful sparks.
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