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Method for achieving beam position measurement based on radiochromic film

A beam position and radiation discoloration technology, applied in radiation measurement, X/γ/cosmic radiation measurement, measurement devices, etc., can solve the problems of small beam current diagnostic devices in space, etc. The effect of meeting the requirements of accelerator beam current diagnosis

Active Publication Date: 2018-12-25
HEFEI CAS ION MEDICAL & TECHNICAL DEVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Facing the problem that the space in the cyclotron is too small to place a large beam diagnostic device, a research on measuring the beam position and profile by using a radiation film was carried out

Method used

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  • Method for achieving beam position measurement based on radiochromic film
  • Method for achieving beam position measurement based on radiochromic film
  • Method for achieving beam position measurement based on radiochromic film

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides a method for measuring the beam position based on the radiochromic film. First, the film is fixed on the film frame, and each beam channel port is placed with a matching frame fixing groove, and the fixing groove is connected to the film frame. Cooperate, install the film to the channel opening to be measured, after the beam is accelerated through the acceleration area of ​​the cyclotron, the beam is drawn out through the extraction channel, and when the beam passes through each channel opening during the extraction process, the beam current The film is vertically incident, and the film will change color after being irradiated, and the beam position information can be judged by analyzing the discolored area. At the same time, according to the internal operation requirements of the accelerator, the interior of the accelerator is in a vacuum state. Among them, the material of the film fixing frame and other parts is preferably SUS316L material wit...

Embodiment 2

[0043] This embodiment provides a method for measuring the beam current position based on radiochromic films. Before the measurement, the unirradiated film needs to be placed in the water film body, and the film is irradiated with a proton beam radiation source of a given energy. , the absolute absorbed dose of the discoloration area of ​​the film is measured by the ionization chamber; the irradiated film is placed in the scanner and processed into a grayscale image, and the image file is imported into the dose processing software to extract its pixel value PV, through the formula (2 ) into the netOD value, combined with the absolute absorbed dose of the film measured by the ionization chamber, to calibrate the absolute absorbed dose-optical density response curve of the film; at the same time, a polynomial curve should be obtained by multiple measurements, so that the error of the subsequent dose contour distribution processing can be as much as possible Small.

[0044] Durin...

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Abstract

The invention discloses a method for achieving beam position measurement based on a radiochromic film. The method comprises the following steps: cutting the film to a required size by a film cutter; adhering the film to a film fixing frame by adopting a vacuum adhesive tape; fixing the fixing frame, a fixing groove and an end surface of a beam channel by using screws; calibrating a calibration film planned to be used before measurement, so as to obtain a film dose-optical density response curve; verifying whether the film is radiochromic or not by beam bombarding during measurement; and afterthe film is scanned by a scanner, inputting the calibrated curve relational expression into a rear-end processing software and processing a chromic area into a dose contour map, related parameter information such as the position of the beam spot can be judged by the contour map. The method for achieving beam position measurement based on the radiochromic film is reliable and simple in principle, high in feasibility and high in operability, and can achieve position resolution below millimeter. Compared with a traditional beam position detector, the placement problem caused by a limited accelerator host place is solved, and thus requirements of accelerator beam diagnosis are met.

Description

technical field [0001] The invention relates to the technical field of beam current measurement, in particular to a method for realizing beam current position measurement based on a radiochromic film. Background technique [0002] In recent years, accelerators have been widely used in medical, industrial, nuclear physics and other fields, especially in the fields of radiopharmaceuticals, tumor treatment and other fields. The destruction of cancer cells by proton targeting can reduce the damage to normal tissues. In order to perform precise treatment on cancer cell tissues, it is necessary to clarify the extraction parameters of the accelerator beam. How to accurately and reliably obtain the relevant parameters of the beam extracted by the accelerator, and improve the quality and efficiency of the beam extracted is currently a more concerned issue. Facing the problem that the space in the cyclotron is too small to place a large beam diagnostic device, a research on measuring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/29
CPCG01T1/2914
Inventor 宋云涛蔡雅倩丁开忠陈永华李君君吴昱城
Owner HEFEI CAS ION MEDICAL & TECHNICAL DEVICES CO LTD
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