共查询到20条相似文献,搜索用时 0 毫秒
1.
《中国原子能科学研究院年报(英文版)》2017,(0)
<正>In recent years,the energy of electronic linear accelerator for nondestructive testing has a higher demand.In 2017,the Linear Accelerator Laboratory successfully won the bid of 2sets of12 MeV nondestructive testing electron linear accelerators from China First Heavy Industries.The main technical indicators are as follows:1)Equivalent steel testing thickness range,76- 相似文献
2.
3.
4.
5.
本文概要介绍了加速器的一般知识和测量准备工作,较详细地介绍了对加速器吸收量,百分深度剂量,射线能量,射野离轴比,射野均坦度等几个主要项目的测量和计算方法,并重点强调了对加速器进行正确可靠的剂量,是放射治疗质量保证和质量控制的重要环节。 相似文献
6.
7.
Chromatic aberration is a major obstacle in the attempt to achieve near atomic resolution in electron microscopes. In analogy to dispersion of colors in a glass lens, nonuniform velocities of the illuminating electrons will reduce the resolution of an electron microscope lens. Instability of the accelerating potential is an important cause of these nonuniformities. To achieve resolution on the order of 1 to 5 ?, accelerating voltage must be stable to approximately 3 parts per million. To achieve these resolutions, a highly stabilized 1 MeV linear electron accelerator was developed. One of its two 15 in. (38 cm) accelerating tubes will provide a velocity stabilized electron beam source for a high resolution electron microscope. Electron acceleration occurs through a constant potential divider. A Van de Graaff type charge carrying pellet string provides the accelerating voltage. The primary or coarse control system for the linear electron accelerator compares the high voltage terminal voltage as detected with an accurate voltage divider to a reference cell voltage. Error signals are amplified to control the voltage on a capacitive liner. Control is accomplished by a voltage control of the cylindrical capacitive liner surrounding the high voltage terminal. The low frequency fluctuations in accelerator voltage maintained by this primary loop are less than 0.1% to permit utilization of a fine control loop with a spectrometer beam analysis control to achieve fine voltage stability of 3 parts per million. 相似文献
8.
9.
《中国原子能科学研究院年报(英文版)》2019,(0)
<正>As known to all,with compact structure,small space and convenient use,X-band electron linear accelerator has been widely used in security areas such as airports and custom.The target in electron linear accelerator plays an important role in the production of photon.Different materials and thicknesses of target have influence on spectrum distribution and dose rate. 相似文献
10.
介绍了一台能量2.5MeV、流强40mA、功率100kW的电子辐照加速器系统的屏蔽设计。实际测量结果表明:屏蔽外的辐射水平低于国家标准规定的限值,设计是合理的。 相似文献
11.
本文建立了10 Mev电子轰击铅靶、铁靶、铝靶产生x射线的几何模型,使用蒙特卡罗程序模拟计算得到了0°~180°方向上产生的x射线能谱和O°、90°、180°方向上的剂量率发射常数。模拟结果表明剂量率发射常数具有明显的方向性,0°方向轰击铅靶最高,随着靶材原子序数的降低或角度的增大而减小;0°方向的X射线能谱最硬,随着靶材原子序数的降低或角度的增大而逐渐变软。 相似文献
12.
加速器辐照装置用于辐照生产医用输液塑料袋原膜材。所研制的350keV电子高压加速器具有以下特点:在静电加速器中采用高压倍压电源代替输电带,此新型结构加速器可输出低能大功率电子束,且体积小、自屏蔽,适于在线辐照加工;一般高压倍压电源采用50Hz供电,而在此装置中由14kHz中频电源供电,高压电源体积小。加速器空载高压达370kV,电子束350keV/20mA,扫描宽度70cm,辐照剂量不均匀性好于7%。该加速器辐照装置已投入运行,并已生产出合格医用输液袋膜材投放市场,产品填补了国内医用输液袋膜材市场的空白。 相似文献
13.
在模拟计算程序LINE-ACC/PC基础上,结合单一搜索方法和非线性最小二乘算法编程,实现一个X波段2MeV行波加速管的物理设计。应用此方法可以有效缩短加速管的优化设计时间。文章给出的优化计算可应用于一类常相速周期结构的加速管设计。文章同时给出了纵向粒子动力学、盘荷波导的几何尺寸及加速管的工作特性等方面的计算结果。 相似文献
14.
Experiments are performed to determine the isotopic composition of the induced activity of a tungsten target for a 10 MeV electron beam. The measurement results are used to calculate the dose rate from the induced activity of the target for an accelerator with 100 kW beam power. It is established that 187W radiation makes a substantial contribution to the dose rate. The neutron yield from the target and the flux density of neutrons scattered in the accelerator room are estimated. 相似文献
15.
《中国原子能科学研究院年报(英文版)》2016,(0)
正Electronic linear accelerator is more and more widely used in medical,non-destructive testing,container inspection and other fields.At the request of the user,we developed a doubleenergy electron linear accelerator with energy of4 MeV/6 MeV.The accelerator can work in 相似文献
16.
17.
10 MeV/50 kW脊型加速器是一种新型大功率电子辐照加速器,其加速腔中所需射频功率高达100 kW,为此专门研制了高功率输入耦合器。该耦合器主要由陶瓷窗、内外导体及耦合环组成,通过等效电路分析以及仿真计算确定了最终结构。设计采用了可独立拆卸的平板型陶瓷窗和可旋转调节的耦合环,以便于进行脊型加速器调试,并在内外导体和耦合环中设计了水冷回路带走功率传输产生的热量。经过测试,该输入耦合器可在0~2.2范围内调节耦合度,并成功向脊型谐振腔中注入了100 kW的脉冲峰值功率。 相似文献
18.
利用德国PTW公司的UNIDOS放射治疗水平剂量仪,TW30013型0.6cc指型电离室,MP3-XS型三维水箱对美国VARIAN公司生产的某Clinac iX型医用电子直线加速器CF因子的TPR_(10)~(20)和D_(20)/D_(10)等关键参数进行测量,并利用Origin9.0统计分析软件进行曲线拟合。得到了X射线Pu-TPR_(10)~(20)、TPR_(10)~(20)-D_(20)/D_(10)和Sw,air-TPR010、电子线Pu-Ez和Sw,air-Rp等关键参数的曲线拟合方程,所有拟合方程的残差平方和都在E-04以下,拟合度很好。 相似文献
19.