Device and method for quickly obtaining development-free verification film dose response curve
A dose-response curve, rinse-free technology, applied in the field of ion beam spot scanning irradiation, can solve the problems of low effective utilization rate of film, long time consumption, cumbersome process of developing film, etc., to reduce the total number of ions, reduce the irradiation time, and improve the effective The effect of utilization
Active Publication Date: 2015-04-08
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology
[0014] Aiming at the problems of cumbersome and time-consuming calibration of radiographic film in the ion beam active beam distribution system, and the low effective utilization rate of the film, the present invention proposes an A method for rapid calibration and process-free verification of film dose-response curves
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Embodiment 1
[0061] Embodiment 1: A device for quickly obtaining the dose-response curve of a no-wash verification film, in which an X-direction scanning magnet 1-1, a Y-direction scanning magnet 1-2, a collimator 3, and a reference Monitoring ionization chamber 4, position sensitive detector 6; pencil beam 2 sequentially passes through X-direction scanning magnet 1-1, Y-direction scanning magnet 1-2, collimation hole of collimator 3, reference measurement ionization Room 4. The position-sensitive detector is a high-resolution multi-wire proportional chamber.
Embodiment 2
[0062] Embodiment 2: The device for quickly obtaining the dose-response curve of the non-processing verification film, the position sensitive detector is a striped ionization chamber. All the other are identical with embodiment 1.
Embodiment 3
[0063] Embodiment 3: The device for quickly obtaining the dose-response curve of the non-processing verification film, the position-sensitive detector is a two-dimensional ion chamber matrix. All the other are identical with embodiment 1.
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The invention belongs to a method for quickly obtaining a radiographic development-free verification film dose response curve in an ion beam spot scanning irradiation technology. A device for quickly obtaining a development-free verification film dose response curve is mainly characterized in that an X-direction scanning magnet, a Y-direction scanning magnet, a collimator, a reference monitor ionization chamber and a position sensitive detector are arranged on a beam line in sequence respectively, wherein a pencil beam passes through the X-direction scanning magnet, the Y-direction scanning magnet, a collimating hole of the collimator and the reference monitor ionization chamber on a beam line in sequence to acquire a pencil beam flow in normal Gaussian distribution at an isocenter. The device and the method have the advantages that (1) the measurement preparation work of operators can be reduced and the beam flow use time and the subsequent film data processing time can be reduced by using a development-free verification film dose calibration method, and (2) infinite data points can be theoretically obtained in Gaussian pencil beam transverse dose distribution and development-free verification film light intensity distribution, so that more data can be selected to perform data fitting to obtain the more accurate film dose response curve.
Description
technical field [0001] The invention belongs to a method for quickly obtaining the dose-response curve of a radiographic and rinse-free verification film in the ion beam point scanning irradiation technology. Background technique [0002] In ion beam applications (such as radiation biology experiments, material physics, radiation therapy, etc.), it often involves the measurement of ion beam radiation field characteristics, such as radiation field dose uniformity or dose distribution measurement. These characteristics can be measured directly by using the ionization chamber matrix, but the spatial resolution of the ionization chamber matrix is low, and it is difficult to meet the requirements of measuring the ion beam spot or the dose distribution of the irradiation field with a large dose gradient. Radiographic film has the advantage of high spatial resolution in measuring the dose distribution of the irradiation field, especially the emergence of no-process verification f...
Claims
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Inventor 刘新国李强贺鹏博戴中颖黄齐艳闫渊林马园园申国盛付廷岩肖国青
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI