| 摘要 |
An ionization chamber for measuring the profile of a radiation field (R) is provided which comprises a first electrode (8) and a second electrode (10) arranged parallel to each other, both electrodes (8, 10) forming a gap (12) therebetween. A shield (14) made of a material opaque to ions produced by the radiation field (R) is movably arranged in said gap (12). It contains an aperture (16) which forms a measuring volume between said electrodes (8, 10). The ionization chamber further comprises means (24) for slideably moving the shield (14) along the gap (12). Thereby, the radiation profile can be measured.
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