"强化国家监管当局对辐射源安全和放射性物质保安监督管理的国际会议”在阿根廷召开

20 0 0年 1 2月 ,国际原子能机构 (IAEA)在阿根廷召开了“强化国家监管当局对辐射源安全和放射性物质保安监督管理的国际会议”(International Conference of NationalRegulatory Authorities with competence in theSafety of Radiation Sources and the Securityof Radioactive Materials)。这次会议是 IAEA加强辐射源安全监督管理行动计划的一部分 ,来自 IAEA、欧洲共同体和 5 9个国家和地区的近 1 0 0名政府官员和专家学者参加了会议。 5 6个国家和地区的代表向会议介绍了本国或本地区辐射源安全监督管理的现状和存在的问题等…     

上海市高风险移动放射源在线监控系统设计及应用

为了降低高风险移动放射源的辐射安全风险,设计了上海市高风险移动放射源在线监控系统.系统硬件采用地理信息定位和辐射剂量率检测集成设备方案,系统软件设计实现放射源实时定位和移动轨迹回看、作业流程合规性检查、放射源失控等报警及辅助搜寻等功能,有效地提升了高风险移动放射源的管理水平.     

改革密封放射源安全和保安监管的几点建议

本文对改革密封放射源安全和保安监管提出了如下几点建议：（1）对源实施“全链式”通报和盘查;（2）促使和鼓励将废源返回源的生产单位或出口国;（3）对源按其潜在危险进行分类并实行分级监管;（4）抓紧制定我国的放射源安全和保安规定。文中还简要阐述了提出这些改革建议的理由或考虑。     

Primary Shielding Design for BRIF

The radioprotection of the Beijing Radioactive Ion-beam Facility （BRIF） has been conducted under the instruction of GB 18871--2002. The shielding of the facility has designed based on the value listed in Table 1.     

江西某带钢公司放射源失控事件引发的思考

2007年11月,江西某带钢公司发生一起因放射源交接把关不严导致的放射源失控事件.本文简要介绍了失控事件的经过,分析了事件调查处理过程中存在的问题,针对发生的原因及存在的问题,提出了改善辐射监管和辐射工作单位安全管理的建议.     

Commissioning of a high-resolution collinear laser spectroscopy apparatus with a laser ablation ion source

Collinear laser spectroscopy is a powerful tool for studying the nuclear spins,electromagnetic moments,and charge radii of exotic nuclei.To study the nuclear properties of unstable nuclei at the Beijing Radioactive Ion-beam Facility （BRIF） and the future High Intensity Heavy-ion Accelerator Facility （HIAF）,we developed a collinear laser spectroscopy apparatus integrated with an offline laser ablation ion source and a laser system.The overall performance of this state-of-the-art technique was eva...     

Beijing Radioactive Ion-Beam Facility Progress Report of Beijing Radioactive Ion-Beam Facilities （BRIF） in 2006

Beijing Radioactive Ion-beam Facilities （BRIF） project is in progress. The preliminary engineering design of BRIF has been finished. The working drawing design of the project and some critical equipment ordering were started in 2006.     

位置未知废放射源的搜寻

依据国际原子能机构的技术文件（IAEA-TECDOC-804，《废放射源的鉴别和定位方法》），结合笔者的理解，简述了位置未知废放射源的野外搜寻方法（包括搜寻前应了解和分析废放射的源有关信息），讨论了搜寻过程中需要注意的问题。     

The Influence of Medium on Low-Voltage Circuit Breaker Arcs

This paper mainly focuses on the influence of three kinds of media： air, air-10%PA （Nylon） and air-10% POM （polyoxymethylene） on low-voltage circuit breaker arcs. A threedimensional （3-D） model of arc motioa under the effect of external magnetic field is built based on magnetohydrodynamics （MHD） equations. By adopting the commercial computational fluid dynamics （CFD） package based on the control-volume method, the above MHD equations are solved. For the media of air-10%PA and air-10%POM, the distributions of stationary temperature and electrical potential and the transient motion processes are compared with those of air arc. The research shows that both air-10%PA and air -10% POM can cool the arc plasma and the former is more effective. Both of them can increase the stationary voltage as well. Moreover, the presence of the two mixtures can accelerate the arc motion toward the quenching area and ensures the arc quenched in time.     

孤儿源搜寻初探

孤儿源的存在是放射源监管的重大安全隐患，并可能引起严重的辐射事故。本文从孤儿源指示迹象、管理角度搜寻和现场搜寻三个方面初步探讨了如何进行孤儿源搜寻，对在孤儿源搜寻过程中需要注意的几个问题进行了分析讨论。     

Microstructure,Hardness and Corrosion Resistance of ZrN Films Prepared by Inductively Coupled Plasma Enhanced RF Magnetron Sputtering

ZrN fihns were deposited on Si（111） and M2 steel by inductively coupled plasma （ICP）-enhanced RF magnetron sputtering. The effect of ICP power on the microstructure, mechanical properties and corrosion resistance of ZrN films was investigated. When the ICP power is below 300 W, the ZrN films show a columnar structure. With the increase of ICP power, the texture coefficient （To） of the （111） plane, the nanohardness and elastic modulus of the films increase and reach the maximum at a power of 300 W. As the ICP Power exceeds 300 W, the films exhibit a ZrN and ZrNx mixed crystal structure without columnar grain while the nanohardness and elastic modulus of the films decrease. All the ZrN coated samples show a higher corrosion resistance than that of the bare M2 steel substrate in 3.5% NaCl electrolyte. The nanohardness and elastic modulus mostly depend on the crystalline structure and Tc of ZrN（111）.     

Administration Progress of HI-13 Tandem Accelerator Upgrading Project in 2005

The HI-13 Tandem Accelerator Upgrading Project, also known as Beijing Radioactive Ion-beam Facility （BRIF）, is an important construction project in the country. The year of 2005 is a very significant year for the project preliminary design. During this year, the preliminary design would be completed basically, and the preparation for the design evaluation and the architecture construct were also initiated in the same time.     

Mean-field effects on matter and antimatter elliptic flow

We report our recent work on mean-field potential effects on the elliptic flows of matters and antimatters in heavy ion collisions leading to the production of a baryon-rich matter. Within the framework of a multiphase transport （AMPT） model that includes both initial partonic and final hadronic interactions, we have found that including mean-field potentials in the hadronic phase leads to a splitting of the elliptic flows of particles and their antiparticles, providing thus a plausible explanation of the different elliptic flows betweenp and anti-p, K＋ and K-, and Jr＋ and ~ observed by the STAR Collaboration in the Beam Energy Scan （BES） program at the Relativistic Heavy Ion Collider （RHIC）. Using a partonic transport model based on the Nambu-Jona-Lasinio （NJL） model, we have also studied the effect of scalar and vector mean fields on the elliptic flows of quarks and antiquarks in these collisions. Converting quarks and antiquarks at hadronization to hadrons via the quark coalescence model, we have found that the elliptic flow differences between particles and antiparticles also depend on the strength of the quark vector coupling in baryon-rich quark-gluon plasma, providing thus the possibility of extracting information on the latter＇s properties from the BES program at RHIC.     

Microstructure and Mechanical Properties of CrN Films Deposited by Inductively Coupled Plasma Enhanced Radio Frequency Magnetron Sputtering

CrN films have been synthesized on Si（100） wafer by inductively coupled plasma （ICP）-enhanced radio frequency （RF） magnetron sputtering. The effects of ICP power on microstructure, crystal orientation, nanohardness and stress of the CrN films have been investigated. With the increase of ICP power, the current density at substrate increases and the films exhibit denser structure, while the DC self-bias of target and the deposition rate of films decrease. The films change from crystal structure to amorphous structure with the increase of ICP power. The measured nanohardness and the compressive stress of films reach the topmost at ICP power of 150 W and 200 W, respectively. The mechanical properties of films show strong dependence on the crystalline structure and the density influenced by the ICP power.     

Study on Extraction of Pu（Ⅳ） by Tri-iso-Amyl Phosphate

The extraction performance of Pu（Ⅳ） with tri-iso-amyl phosphate （TiAP） were studied. The effects of the concentration of nitric acid and the ratio of phase on the extraction efficiency of Pu（Ⅳ）, and on the formation of second organic phase were investigated. The experimental results indicate that the distribution ratios of Pu（Ⅳ） increase obviously with increasing aqueous nitric acid concentration,     

A Simplified Numerical Study of the Kr/Cl2 Plasma Chemistry in Dielectric Barrier Discharge

In this paper, the generation of excimers and exciplexe radiation in mixtures of rare gas with halogen by homogeneous dielectric barrier discharge （DBD） is investigated. The typical characteristics of an excilamp based on KrCl exciplexe molecules and the kinetic processes for the formation and the decay of this molecules in the Kr/Cl₂ mixture are studied. The computer model developed is based on the Kr/Cl₂ mixture chemistry, the equivalent electric circuit and the Boltzmann equations. The importance in the kinetic processes of some species such as the metastable state of Krypton （Kr（3P0,2）） and the negative ion of chloride （Cl） is considered. The results illustrate the time variations of charged species （ne,Kr+,Cl,Cl+,Cl+2,Kr+2）, excited atoms and molecules （Kr（3P0,2）, Kr（3P1）, Cl, Cl2）, the excimers （Kr2,KrCl（B）,KrCl（C）,Kr2Cl） and the UV photon concentrations （in 222nm,235nm,258nm and 325nm range）. The effects of chlorine concentration and the total gas pressure in the Kr-Cl₂ discharge on the electric parameters and radiation emissions are investigated.     

Neutronic study on the effect of first wall material thickness on tritium production and material damage in a fusion reactor

In this study, the effects of changing first wall materials and their thicknesses on a reactor were investigated to determine the displacement per atom（DPA） and gas production（helium and hydrogen） in the first wall, as well as the tritium breeding ratio（TBR） in the coolant and tritium breeding zones. Therefore, the modeling of the magnetic fusion reactor was determined based on the blanket parameters of the International Thermonuclear Experimental Reactor（ITER）. Stainless steel（SS 316 LNIG）, Oxi...     

PIC-EDDY Simulation of Different Impurities Deposition in Gaps of Carbon Tiles

A 3D Monte Carlo （MC） code PIC- EDDY, based on EDDY （erosion and deposition dynamic simulation） code, was used to investigate the redeposition of different impurities in the gaps of C tiles. By incorporating the rate coefficients of beryllium （Be） and tungsten （W） into the code, we obtain deposition profiles of hydrocarbon, beryllium and tungsten particles in the toroidal and poloidal gaps, respectively. The redeposition rate of tungsten was found to be higher than those of other impurities in the gaps, except at the bottom, due to its easier local deposition within one gyroradius. Due to the effect of reflection coefficients of hydrocarbon fragments on graphite, fewer hydrocarbons were resided at the entrance while more were deposited on the sides of the gap. At elevated plasma temperatures （such as 30 eV）, asymmetric deposition distributions were observed between the toroidal and poloidal gaps due to the dominant ionized particles. Ions were mainly deposited within 1 mm depth inside gaps, and the bottom deposition particles were almost all neutrals.     

Experimental Determination of the ICRF Power Depositing on the Electrons in HT-7

This paper reports for the first time an experimental study on the power deposition profile of the ion cyclotron range frequencies （ICRF） power depositing on electrons in HT-7. The fast Fourier transform （FFT） analysis and the break in slope （BIS） method are utilized to obtain the information of the power deposition. The results indicate that the electrons were heated directly, and the electrons absorbed around 20% of the input power of the discharge of interest.     

Comparison of Design Alternatives and Selection of Manufacturers for Main Magnet Construction of CYCIAE-IO0

The 100 MeV high intensity cyclotron, CYCIAE-100, is an advanced accelerator project in China.The fabrication of the main magnet is the key part of the construction for CYCIAE-100 and the technology division of BRIF is consistently taking a discreet attitude towards the magnet design. From the year 2004 to 2005, we carried out intensive investigation on the deign features of the magnet of cyclotrons in institutions and companies like TRIUMF （Canada）, PSI （Switzerland）, GANIL （France）, Cyclotron Advance （Canada）, and so on.