门电路在核监测仪器中的应用

介绍了门电路在核监测仪器中的应用情况，重点是门电路用于组成振荡器，用于控制，用于级联，用于整形，用于甄别等方面的情况。     

用于放免治疗单克隆抗体的研究进展

介绍了用于放射性核素免疫治疗的单克隆抗体90年代以来的最新研究进展。归纳了用于放免治疗的放射性核素和单克隆抗体，并比较了各自的优缺点；介绍了用于放免治疗单抗的剂量、毒性和放射生物学特性等问题；指出了单克隆抗体用于单克隆抗体用于放免治疗发展过程中存在的问题、可能的解决方案及其今后的发展趋势。     

用于加速器数字反馈控制研究的实验平台

本文介绍了用于加速器数字反馈控制研究的实验平台。该平台由四极磁铁、磁铁电源、Hall电路、DSP系统和用于系统开发的计算机组成。它不仅可用于加速器轨道反馈控制等系统级的研究,而且还可以用于研究高精度电源和高频系统低电平等设备级的数字反馈控制。     

ESR技术在生物医学领域内的应用概况

自由基理论在生物医学领域中的应用越来越多。而ESR技术是目前研究自由基信息的最好手段。ESR技术在生物医学中的应用主要有：是辐射消毒的定量和定性的临控手段;用于电离辐射剂量估算和重建;用于检测组织氧化能力,在临床上协助肿瘤治疗方案的选择;用于骨移植研究中,可定量检测被照射的移植骨的吸收程度;用于发病机理方面的研究;用于筛选辐射防护剂方面的研究等。     

苏联的几种找铀仪器

据苏联1970—1971年报导,苏联又设计了几种仪器。现分别简介如下。 1.型野外闪烁射气仪。该仪器用于普查铀矿和用于剂量检查。 2.-68型轻便闪烁辐射仪。用于地表测量、炮眼测量和浅孔测量。 3.-1”型测井仪。用于在钻孔中测量     

新型航空辐射测量仪的研制

介绍了一种用于快速大面积辐射测量的仪器,该系统用于核爆炸及核事故应急监测。     

文献题录

Radiation Protection Dosimetry　Vol.84No.1-41999(续 )　仪器用于测年法和回顾性剂量测定法的光激发光技术的开发 L Botter- Jeusen等 (特约论文 )利用 Al2 O3脉冲光激发光的辐射剂量学 S W S Mc Keever等国际空间站上用于剂量监测的机载 TLD系统 I Apathy等用于测量沙粒般大单颗粒的高灵敏度光激发光扫描系统 G A T Duller等用于测量光子、β和中子剂量当量的直接离子贮存剂量计 C Wernli等用于回顾性剂量测定法剂量学和测年法中石英的光激发的蓝光发射二级管 L Botter- Jensen等用于电子剂量学的低成本硅光电二级管 H JKh…     

FD—140型高灵敏测氡仪及其应用

FD—140型高灵敏测氡仪用于测量氡的浓度,测氡灵敏度可达15mBq/m~3 min。该仪器可用于普查与勘探铀矿床,也可用于找石油、煤、金、地下水和地震预报以及地质构造调查等方面。     

革新的希望——核能远景

当“原子用于和平”走过50年之际，核能在朝什么方向发展?沿着这条道路是否有一个“更加绿色”的未来?现在该是我们将目光从“原子用于和平”转向“原子用于和平与繁荣”的时候了。     

美能源部为新型紧凑加速器研发资助1000万美元

正【美国能源部网站2020年1月27日报道】2020年1月27日,美国能源部(DOE)宣布将提供1000万美元,推动可用于医疗、安保、能源和工业领域的粒子加速器技术发展。在能源部资助下,科研人员将把目前主要用于科学研究的尖端加速器技术转变为可用于医疗和工业的有效工具,尤其关注开发可用于癌症治疗的新型"紧凑型"加速器技术。     

Injection system of the minicyclotron accelerator mass spectrometer

The existing injection system of the SMCAMS(super-sensitive minicyclotron accelerator mass spectrometer)is described together with the discussion of its disadvantages exposed after having been operating for five years.which provides a basis for consideration of improvements to the injection system.An optimized injection system with an analytical magent added prior to the minicryclotron has been proposed and calculated.     

专用于加速器质谱计的小型回旋加速器中的若干关键问题

介绍了超灵敏小型回旋加速器质谱计发展过程中出现的电场渗透，真空条件对束流传输效率稳定性和同位素比测量精度的影响。空间电荷效应和Ｘ射线本底等特殊现象和问题，以及通过多年的观察和实验，寻找到的克服和解决这些问题的办法。     

Study of Al measurement on the Shanghai Mini-cyclotron based AMS

We present a modification to the ¹⁴C-dedicated SMCAMS (Shanghai mini-cyclotron based AMS) system to allow the measurement of ²⁶Al for biomedical applications with the existing devices. This is accomplished by determining the turn number, harmonic number and RF frequency theoretically and then making the appropriate orbit programming and beam optics calculation and experimental adjustments. The tests were conducted using pencil graphite (for the carbon pilot beam), Al₂O₃ powder and metal aluminum to accelerate ions with mass number of 24, 25, 26 and 27. The frequency response curves for those ions are shown. Finally, the Al₂O₃ standard sample with a known isotope ratio of 1.0 × 10⁻¹⁰ is measured. The ²⁶Al⁻ ions are detected and its frequency response curve shows the peak of ²⁶Al⁻ though very weak is well separated from the most neighboring interfering molecular ions ²⁵MgH⁻.     

用于高速脉冲取样的多路扫描电路

指出高速脉冲取多路模拟开关、逻辑控制电路和输出增益电路四部分,给出具体电路设计和硬件组成.计算机仿真的逻辑时序表明,扫描电路工作正常,通过增益放大后的输出可提供给数字示波器或虚拟仪器平台Labview真实再现被测高速脉冲波形.     

Design and development of a device management platform for EAST cryogenic system

EAST cryogenic system is one of the critical sub-systems of the EAST tokamak device. It is a large scale helium cryoplant, which adopts distributed control system to realize monitoring and control of the cryogenic process and devices. However, the maintenance and management of most field devices are still in the corrective maintenance or traditional preventive maintenance stage. Under maintained or over maintained problems widely exist, which could cause devices fault and increase operation costs. Therefore, a device management platform is proposed for a safe and steady operation as well as fault diagnosis and predictive maintenance of EAST cryogenic system.This paper presents the function design and architecture design of the cryogenic device management platform. This platform is developed based on DeltaV DCS and acquires monitoring data through OPC protocol. It consists of three pillars, namely device information management, device condition management, and device performance monitoring. The development and implementation of every pillar are illustrated in detail in this paper. Test results and discussions are presented in the end.     

紧凑型自聚束微波电子枪实验装置控制系统的研制

紧凑型自聚束微波电子枪的实验装置需要相应的控制体系。为此,研制了一套独立于原有大装置(200MeV LINAC)的监测控制系统。该系统基于一般控制系统的三层构架原理,由核心控制电路、光信号发射与接收电路和开关量读写电路组成,实现了时序控制、设备状态监控、联锁控制等功能,并利用上位机与现场处理器通信,达到远程操作的目的。经测试,该系统的性能参数满足并优于实际需求,试运行期间工作稳定可靠,满足实验平台的控制需求。该系统也能直接用于其他小型加速器的控制操作。     

一种核空气净化系统吸附剂取样装置的设计与试验北大核心CSCD

设计了一种用于核电厂通风净化系统吸附剂的取样装置,该装置可提供与净化系统内碘吸附剂具有同样运行历史的浸渍活性炭碘吸附剂样品以方便进行定期监督试验。相关验证试验结果表明:6个取样样杯之间的压差非常接近,且流速均在吸附剂流速的±10%之内,因此可以确保6个样杯内的活性炭样品具有相同的与运行气体的接触特性,从而具有同样的代表性;通过6个取样样杯的风速与通过系统主体的风速一致,因而保证了取样样杯里的吸附剂与系统主体的吸附剂具有相同的与空气接触特性;加装取样装置对净化系统的运行没有影响。     

双光束白光干涉系统的理论模拟与实验研究

为了实现一般性样品的自由电子激光三维成像,搭建了一套用于上海软X射线自由电子激光装置的双光束单脉冲三维成像装置。计划利用可见光对该成像装置进行离线时空对准,利用自由电子激光对其进行在线时空对准。为了保证离线对准的顺利实现,需要搭建一套基于双光束白光干涉原理的离线对准系统。本文设计了一套双光束白光干涉系统,并结合波动光学原理和MATLAB软件对其进行了离线对准原理的理论模拟验证。随后搭建了该套系统,并成功对该系统进行了时空对准调试与验证,时间对准调节精度达48.1 fs。经简单改进后,该系统可作为自由电子激光三维成像装置的离线对准系统,用于其离线对准调节。     

Innovative design of viscoelastic dampers for seismic mitigation

In this paper, an advanced and more reliable design of viscoelastic dampers for seismic mitigation of high-rise buildings is presented. The innovative design of energy-absorbing devices has some advantages, compared to the classical design, as follows: one, the device is directly subjected to shear strains and forces due to story drifts; two, the device can support its own weight during normal operations, and maintain stable for large deformations during earthquakes; three, the device can reduce the responses of a structure to horizontal as well as vertical seismic loadings; and four, the device can also decrease the responses of the floor system of a building. In this study, a ten-story building is given as an example to express the merits obtained from the new system. Comparisons of the building equipped with classical and proposed devices of viscoelastic dampers are carefully studied. Numerical results show that the energy-absorbing capacity of the new device is superior to the classical one, especially for vertical vibrations.     

在线啜吸检测装置的研制

为检测秦山二期核电工程燃料破损情况,选用气体作检测介质,＾１３３Ｘｅ作显示核素,装卸料机套筒为隔离体,研制了在线啜吸检测装置。本文介绍了该装置的设计要求,设计原理及装置中几个重要系统的调试。经高度表明;本装置具有满意的性能,易于操作,可满足核电工程的需要。