| 摘要 |
PURPOSE:To measure radiation dose distributions automatically and continuously in the position away from the measuring object by providing a collimator which has a radiation transmission hole having the specified opening angle to the measuring object and one radiation detector behind the same and moving the detector in the arc from centering at the transmission hole. CONSTITUTION:A radiation transmission hole having the specified opening angle from the front and back is provided to the collimator 1 which is made of a plate such as lead of small radiation transmittance. The radiation detector 3 placed behind the collimator 1 moves in the arc form centering at the transmission hole to detect the radiations from the measuring object 4. The range of measurement is determined by the opening angle of the transmission hole and the moving range of the detector 3. The output of the detector 3 is amplified by a sense amplifier 5, is removed of noise in an amplitude discriminating circuit or the like, and is input to a processing unit 6, by which the two-dimensional radiation dose distributions are displayed in a display device 7. At the same time, the data collection is accomplished automatically by a recording device 8.
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