单车车载式60Co集装箱检测系统辐射源装置

文章涉及单车车载式60Co集装箱检测系统辐射源装置的结构设计方案和工作原理。该辐射源装置样机的试验运行结果表明:辐射源装置的工作和运输状态可靠安全、操作方便,满足了单车车载式60Co集装箱检测系统要求。     

职业照射控制 工作人员防护

工作人员防护旨在使每天从事辐射源工作的雇员“不受伤害”的不锈钢屏障、铅防护板、空气过滤系统、呼吸器等各种装置反映了职业照射控制的一个关键原则。辐射防护措施对辐射源必须是充分的。     

针孔照相技术在核探测中的应用

利用各种相机拍摄可见光源的静态或动态照片是一种很容易的事,但拍摄不可见光源(如核辐射源)的照片就不是那么容易了。随着科学技术的发展,近10年来,在国内外核探测技术中发展一种针孔照相技术,用以获得X射线、γ射线和中子强度的空间分布、时间谱和能谱等,为受控热核反应、核反应堆、高温等离子体等方面的研究提供一种诊断方法。近年来,我们在针孔照相技术方面做了一些探索性工作,研制出一套针孔照相系统,并利用这套装置对X辐射源进行了初步研究。拍摄到X辐射源的照片,仅供参考。     

1400—22400克镭当量Co~(60)γ射线源装置

一、前言辐射源装置的数量和强度的急剧增长,可作为辐射化学迅速发展的标志。目前,在辐射化学研究中,各国广泛地以放射性Co~(60)作为辐射源,这是因为Co~(60)γ射线比较单色、能量高和半衰期较长,同时随着反应堆的不断建立,得来也比较容易。与别的辐射源装置相比,建立Co~(60)源装置也比较简单。     

高功率脉冲对电子设备干扰的研究

高功率脉冲辐射源通过高增益天线定向将脉冲辐射出去,以极高的强度照射目标,利用高能脉冲对无线电、通讯系统、计算机系统等电子设备进行干扰甚至破坏.论文介绍了高功率脉冲辐射源的结构和工作原理,并对辐射源辐射电子设备实验进行分析,实验结果表明:高功率脉冲可以干扰电子设备正常工作,从而达到破坏对方电子通信的目的.     

核电厂辐射安全风险管控分析与建议

核电厂在建造、运行和换料大修期间需要使用大量的放射源和射线装置等辐射源进行探伤、检测活动。核电厂放射源和射线装置的管理使用单位众多、工作环境复杂且辐射防护条件受限,其辐射安全风险不容忽视。在现状分析讨论基础上提出了对高风险源实施全过程管控、创新核电厂辐射安全许可证发证模式等建议。     

核动力装置主辅系统辐射源强计算

本文介绍我们编制的用于计算堆芯燃料元件、堆内部件活化以及核动力装置主、辅系统辐射源强的程序。它是屏蔽设计的基本工具之一,也为剂量监测、环保安全和废物处理提供有关的参数。     

我国辐射源数据管理现状及探讨

我国已经在辐射安全许可证行政审批、监督检查等方面积累了大量的数据、资料,辐射源数据管理是辐射源安全管理的重要内容。本文介绍了我国辐射源数据管理的主要内容、环节和现状,当前使用的RAIS系统的优缺点,分析和探讨我国建立网络化辐射源监管信息系统的途径。     

秦山核电厂大修期间辐射源项分析

本文介绍了秦山核电厂大修期间主要系统设备辐射源项的特点,分析了辐射源项的主要核素及影响因素,提出了降低大修作业现场辐射源项的措施。     

能量响应标定中的单能γ获取技术

简要叙述了将强^60Co辐射源转换为系列单能γ辐射源的原理和方法,重点介绍了两个关键技术。辐射屏蔽技术和降低能量弥散技术．研制出了一个有效的实验装置．使信噪比达到了10：1、能量弥散度达到了6％以下。     

托卡马克聚变中子源的数值模型研究

托卡马克(Tokamak)聚变装置中子学分析中,聚变中子源描述是重要的输入参数,其准确性直接影响分析结果的可靠性。通过分析ITER和欧洲聚变示范堆(EU DEMO)中子学分析中所采用的聚变中子源模型,提出了一种完整描述Tokamak中L-mode、H-mode等离子体的D-D、D-T聚变中子源的数值模型。在中国聚变工程实验堆(CFETR)的工程集成设计平台上,编写了基于蒙特卡罗算法的程序SCG求解该数值模型,实现了读取(零维)等离子体参数、输出可供典型中子学软件MCNP直接读取的中子源定义文件的功能。以CFETR氦冷球床包层的中子学分析模型为基准,在相同的L-mode等离子体D-T聚变工况下,相较于采用EU DEMO源子程序,采用本模型计算得到的中子壁负载差异最大值为2.02%,包层氚增殖率差异为0.18%,全堆能量增益因子的差异为0.23%。结果表明,本模型与其他源描述的差异较小,可应用于CFETR的中子学分析。     

三管TDCR猝灭效率曲线法测量液体闪烁源的活度

简述了利用三个匹配的光电倍增管构成的TDCR方法测量液体闪烁源的原理、方法。用一套已知活度的^14C（正十六烷）液体闪烁猝灭系列源对该方法作了验证。提出提高探测效率,减小外推误差的方法。编制了测量过程的计算机程序。     

90Sr-90Y源半导体器件辐照效应在线测量系统

介绍了一种新型半导体效应参数测量装置,以＾９０Ｓｒ－＾９０Ｙ为模型源辐射装置与半导体参数测量仪共同组成半导体器件辐射效应测量系统,可进行各类器件和电路总剂量辐照效应测量与分析,系统实现了在线测量和辐射剂量率的连续调节,特别适宜对于卫星空间辐射环境的模拟。     

Evaluation of D（d,n）^3 He reaction neutron source models for BNCT irradiation system design

A mathematical method was developed to calculatc the yield.energy spectrum and angular distribution of neutrons from D(d,n)3 He(D-D)reaction in a thick deuterium-titanium target for incident deuterons in energies lower than 1.0MeV.The data of energy spectrum and angular distribution wefe applied to set up the neutron source model for the beam-shaping-assembly(BSA)design of Boron-Neutron-Capture-Therapy(BNCT)using MCNP-4C code.Three cases of D-D neutron source corresponding to incident deuteron energy of 1000.400 and 150 kaV were investigated.The neutron beam characteristics were compared with the model of a 2.45 MeV mono-energetic and isotropic neutron source using an example BSA designed for BNCT irradiation.The results show significant differences in the neutron beam characteristics,particularly the fast neutron component and fast neutron dose in air,between the non-isotropic neutron source model and the 2.5 MeV mono-energetic and isotropic neutron source model.     

Evaluation of D(d,n)3 He reaction neutron source models for BNCT irradiation system design

A mathematical method was developed to calculate the yield,energy spectrum and angular distribution of neutrons from D(d,n)~3He(D-D)reaction in a thick deuterium-titanium target for incident deuterons in energies lower than 1.0MeV.The data of energy spectrum and angular distribution were applied to set up the neutron source model for the beam-shaping-assembly(BSA)design of Boron-Neutron-Capture-Therapy(BNCT)using MCNP-4C code. Three cases of D-D neutron source corresponding to incident deuteron energy of 1000,400 and 150 key were inves- tigated.The neutron beam characteristics were compared with the model of a 2.45 MeV mono-energetic and isotropic neutron source using an example BSA designed for BNCT irradiation.The results show significant differences in the neutron beam characteristics,particularly the fast neutron component and fast neutron dose in air,between the non-isotropic neutron source model and the 2.5 MeV mono-euergetic and isotropic neutron source model.     

Design of a 5 MeV electron linac based X-ray source

A compact X-ray source, based on a 5 MeV autofocusing electron linac, has been designed and set up for radiographic purposes at the Dipartimento di Fisica, Università di Messina. A detailed study has been performed, by means of the MCNP-4C2 code, on the optimization of the parameters involved in the X-ray production, transport and detection, that will be described in this paper, as well as the final source configuration pattern.     

基于改进粒子滤波的未知放射源定位方法

为应用自主移动机器人搜寻未知放射性物体,本文基于递推贝叶斯估计模型提出了一种改进粒子滤波的放射源定位方法。首先,建立初始粒子集,并根据观测值对粒子权值进行更新和归一化;其次,在重采样过程中引入自优化的重采样方法来增加粒子多样性;最后,对满足收敛条件的粒子进行加权求和估计出放射源位置与活度参数。仿真实验表明该方法可行有效：无屏蔽环境下具有较高的定位精度;有屏蔽环境下也能找到放射源的大致位置,为放射源的最终定位提供参考。     

Location Method of Radioactive Source Based on Improved Particle Filtering

In order to use the autonomous mobile robot to search for unknown radioactive objects, a method for locating the radioactive source with improved particle filtering was proposed based on the recursive Bayesian estimation model. Firstly, an initial particle set was established, and the weight of the particle was updated and normalized according to the observation value. Secondly, the auto-optimal resampling method was introduced to increase the particle diversity in the resampling process. Finally, the particle carrying out the convergence condition was weighted and summed to estimate the position and activity parameters of the radioactive source. The simulation results show that the method is feasible and effective. The positioning accuracy is high in the unshielded environment, and the approximate position of the radioactive source can also be found in the shielded environment, which provides a reference for the final location of the radioactive source.     

Studies on the Matching Network of the High Power Radio Frequency Transmitter for the NBI RF Ion Source

A radio frequency (RF) driven ion source has been developed at ASIPP (Institute of Plasma Physics, CAS) for the neutral beam injector with a 1 MHz, 25 kW RF power supply system. The paper describes the studies performed with emphasis on the RF matching network system design based on the dedicated Smith chart analyses to improve and simplify the optimized solution. Also the future RF matching network design was analyzed with the matching transformers which were set between the high-power RF transmitter and the RF driven ion source to isolate the high voltage from the accelerator of the ion source.