| 摘要 |
PURPOSE:To measure radiation dose distributions automatically and continuously in the position apart from the measuring object by such things as disposition of a collimator which is provided with a radiation transmission hole having the specified opening angle to the measuring object and a plurality of radiation detectors behind the same. CONSTITUTION:There is a radiation transmission hole having the specified opening angle from the front and back in the collimator 1 which is made of a plate body of lead or the like of small radiation transmittance. A plurality of radiation detectors 31-3n are placed at approximately an equal spacing in the arc form centering at the transmission hole, behind the collimator 1 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 disposition of the detectors 3. The outputs of the detectors are amplified by sense amplifiers 51-5n, and are removed of noise by an amplitude discriminating circuit or the like, after which they are input to a processing circuit 6. In the processing circuit 6, the outputs from the respective sense amplifiers 51-5n are converted to, e.g., time-series signals which are then fed to a display device 7. At the same time, the data collection is automatically accomplished in a data recording device 8.
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