N^＋和Mo^＋注入对Cr12MoV钢硬度的影响

考查了Ｃｒ１２ＭｏＶ钢经Ｎ＾＋，Ｍｏ＾＋离子注入前后的硬度，用金相方法和ＡＥＳ分析了Ｃｒ１２ＭｏＶ钢金相组织和注入层的成分，研究了离子注入对Ｃｒ１２ＭｏＶ钢洛氏硬度和努氏硬度的影响。     

绿豆种胚中离子注入深度的研究

通过ＳＥＭ和ＳＩＭＳ检测到了离子注入以后绿豆种胚内部的铜元素和钛元素的浓度随深度的分布一形貌变化，说明了离子注入诱发为是带电粒子直接作用的结果。     

Au离子注入花生种胚深度的研究

使用金属蒸汽真空孤离子源（MEVVA源）离子注入机对花生种胚进行Au离子的注入，采用卢瑟福背散射（RBS）和X射线能谱分析（EDAX）法测量Au元素在花生种子中的深度分布，并观察注入前后的样品形貌。结果表明，由于样品表面粗糙，RBS不适于测量Au元素在花生种子中的浓度分布，而EDAX的测量则显示Au元素在花生种子的最大穿透深度可达15μm。另外本文还讨论了离子注入的诱变机理。     

GIC－4117／HC1．7MV Tandetron上的MeV离子注入系统

利用通用离子公司（ＧＩＣ）的４１１７型１．７ＭＶＴａｎｄｅｔｒｏｎ离子束分析设备进行ＭｅＶ级离子注入。所注入的离子能量范围由５００ｋｅＶ到１０ＭｅＶ，离子的质量在２４０ｕ以下，某些元素的负离子束流强度在１５０μＡ以上。双向机械扫描技术可将离子均匀地注入样片。     

GIC—4117／HC1.7MV Tandetron上的MeV离子注入系统

利用通用离子公司（ＧＩＣ）的４１１７型１．７ＭＶ Ｔａｎｄｅｔｒｏｎ离子束分析设备进行ＭｅＶ级离子注入。所注入的离子能量范围由５００ｋｅＶ到１０ＭｅＶ，离子的质量在２４０ｕ以下，某些元素的负离子束流强度在１５０μＡ以上。双向机械扫描技术可将离子均匀地注入样片。     

^16O弹性前冲测量氦的深度分布

利用１２ＭｅＶ的１６Ｏ离子弹性前冲测量（ＥＲＤ）方法，研究了以２０ｋｅＶ和４０ｋｅＶ注入４Ｈｅ的镀钛样品。通过分析ＥＲＤ能谱，得到了注入４Ｈｅ的深度分布，并与非卢瑟福背散射结果进行了比较。对４０ｋｅＶ注入的样品观察到有双峰分布，２０ｋｅＶ注入的样品没有双峰分布，实验结果与ＴＲＩＭ模拟计算结果进行了比较。     

低能重离子注入麦胚引起深层细胞损伤的一种可能机制

讨论了低能重离子注入麦胚造成深层细胞损伤主要是注入离子与小麦组成各元素发生相互作用后的次级过程中产生了特征Ｘ射线。以能量较高（３。５８９ｋｅＶ），强度相对贡献较大的钾元素为例，当强度减弱至原来的２＾－＾１＾０时，其穿越麦胚深度可达３７０μｍ，可谓是“长射程”。小麦种子在深层能受到低能离子注入的影响，可能正是由于这种次级过程的“长射效应”。     

^153Sm—EDTMP的纸色层行为研究

采用两种新的＾１５３Ｓｍ－ＥＤＴＭＰ纸色层展开体系：Ｖ（氨水）：Ｖ（甲醇）：Ｖ（水）＝０．１：２：４（ｐＨ＝１１．０－１４．０）和Ｖ（氨水）：Ｖ（丙酮）：Ｖ（水）＝０．２：０．５：４（ｐＨ＝７．０－９．０）来研究＾１５３Ｓｍ－ＥＤＴＭＰ的纸色层行为，新体系比原有体系Ｖ（吡淀）：Ｖ（乙醇）：Ｖ（水）＝１：２：４的展开时间短，分离效果好，其中（氨＋丙酮＋水）体系分离效率高，标记峰不存在拖尾，展开时间缩     

高能离子注入对聚酚亚胺薄膜硬度的影响

报道了聚酚亚胺薄膜在高能（６５０ｋｅＶ－２ＭｅＶ）Ｂ＋、Ｃ＋和Ｃｕ＋离子注入后硬度的变化。对注入样品进行了显微硬度测量和ＸＰＳ及ＲＢＳ分析，观察了硬度与离子种类、能量及注入剂量的依赖关系。结果表明，离子注入之后薄膜样品的显微硬度值明显提高，注入离子在样品中的电子能量损失对聚合物材料改性起着关键作用。ＸＰＳ和ＲＢＳ分析显示，离子注入之后聚酰亚胺薄膜中Ｃ的含量增加，形成了以苯环结构为主的新的交联网状结构。     

C、Co及C+Co双注入对高速钢机械性能影响的研究

采用ＭＥＶＶＡ源离子注入机对高速工具钢进行了Ｃ,Ｃｏ及Ｃ＋Ｃｏ注入,并做了硬度,摩擦系数测量和磨损实验,Ｃ离子注入剂量３×１０＾１７ｃｍ＾－２能量６０ｋｅＶ,Ｃｏ离子注入剂量为２×１０＾１７,４×１０＾１７,６×１０＾１７ｃｎ＾－２能量１０２ｋｅＶ。结果表明,不同元素,不同剂量的离子注入均能有效地改善ＨＳＳ的硬度和摩擦磨损特性,从而极大延长ＨＳＳ的工作寿命,且随着注入剂量的增加,改善的效果有所增强     

Preparation of Zn/TiO2 powder and its photocatalytic performance for oxidation of P-nitrophenol

Zn-doped TiO2 catalysts were prepared using a sol-gel method and characterized by XPS,UV-Vis, BET, XRD in this study. Under the irradiation of simulant sunlight, the photocatalytic activity for the degradation of p-nitrophenol was studied too. After irradiation for 2.5 h, the degradation percentage of p-nitrophenol could rise to more than 80 %. The results showed that the spectrum absorption band edge of Zn/TiO2 powder does not broaden obviously comparing with pure TiO2 powder. Zinc exists as Zn （11）. When calcined at 973 K, there is a new phase as ZnTiO3 in Zn/TiO2 catalyst. The order of photocatalytic activity of Zn/TiO2 catalysts calcined at different temperatures for p-nitrophenol is 773 K 〉 673 K 〉 873 K 〉 573 K 〉 973 K and the photocatalytic activity of Zn/TiO2 catalyst calcined at 773 K is better than TiO2 catalysts heated at the same temperature, and outclasses that of commercial TiO2 catalyst. It also showed that the photocatalytic degradation of p-nitrophenol follows first-order kinetics under the irradiation of simulant sunlight.     

Current status of radiation therapy for prostate cancer

Radiotherapy for the treatment of prostate cancer has been extensively explored in the past. Along with the comprehensive understanding of the biology of prostate cancer and rapid advances in terms of technology, the out- come of treatment for the patients with prostate cancer has improved. The authors review radiotherapy as the primary treatment for the disease, with particular emphasis on the technological advances from both the radiobiological and radiophysics aspects. Nonconventional fractionated irradiation like hyper- or hypo-fractionation has been imple- mented in the clinic, the final results still need to be confirmed in the future. Technological advances like IMRT, IGRT, in the last two decades have significantly improved the delivery of external radiotherapy to the prostate. This has re- sulted in an overall increase in the total dose that can be safely delivered to the prostate, which has led to modest im- provements in the biochemical outcome. However, establishing the standard therapy for prostate cancer remains con- troversial. It is hoped that the next decades will bring continued advances in the development of biologicals that will further improve current clinical outcomes.     

The control system for SSRF injection and extraction

This paper introduces the injection and extraction control system design for SSRF,which is a distributed control system aimed at stability and reliability of the pulse power supplies,PPS(Personnel Protection System)and MPS(Machine Protection System).The hardware environment is mainly based on PLC(Programmable Logic Con- troller),and ARM(Advanced RISC Machine)is also applied for studying stability of the power supplies.WinCC and EPICS(Experimental Physics and Industrial Control System)have been selected as the platforms of SCADA(Super- visory Control and Data Acquisition).For unifying the interfacing to the control computer,all front-end equipments are connected via Industrial Ethemet.     

水平管内含空气蒸汽强制对流冷凝换热模型研究

为研究含空气蒸汽在水平管内强制对流冷凝换热特性,基于对传热传质过程的分析,建立了管内为环状流与波状流条件下的流动冷凝换热模型。从潜热、显热和液膜3个环节对整个换热过程进行建模,最终得到计算局部冷凝换热系数的理论关系式。模型预测结果与实验数据的对比表明,二者相对偏差在±20%以内,验证了该换热模型的准确性与适用性。通过进一步的研究发现：从换热管入口至出口,随着冷凝的进行,管内换热主要热阻由液膜热阻向气液界面的凝结热阻转变;主流气体对流换热过程基本可忽略。     

Investigations on landmine detection by BF3 detector

Experiments were carried out to investigate the possible use of neutron backscattering for the detection of polyethylene (PE) sample buried in the soil. In detection of landmine by neutrons, the neutron detector and its shield play an important role. In this paper, the effects of graphite, heavy water, polyethylene and boric acid moderators on the flux of back scattered neutrons were investigated. We have also experimentally verified the effect of BF3 detector shield and obtained good agreement with theory.     

Web Services interface of SSRF archive data analysis system

Accelerator database stores various static parameters and real-time data of accelerator. SSRF (Shanghai Synchrotron Radiation Facility) adopts relational database to save the data. We developed a data retrieval system based on XML Web Services for accessing the archive data. It includes a bottom layer interface and an interface applicable for accelerator physics. Client samples exemplifying how to consume the interface are given. The users can browse, retrieve and plot data by the client samples. Also, we give a method to test its stability. The test result and performance are described.     

Assessment of radioactivity levels in some oil samples from the western desert, Egypt

Distributions of natural gamma-emitting radionuclides were determined in 93 oil samples collected from some petroleum fields in the western desert of Egypt. The radioisotope activities in the area under investigation lay in the range of (21 ± 4) to (38 ± 13) Bq?L-1 for 226Ra, (9 ± 2) to (15 ± 5) Bq?L-1 for 232Th, and (154 ± 28) to (303 ± 54) Bq?L-1 for 40K. The mean values were 27, 12, and 201 Bq?L-1, respectively. Among oils, variations in radionuclide ac- tivities could be on account of differences in TDS, HCO3, and Ba, with high or low pH. In this environment, oil prop- erties differently affected the mobilization of natural radionuclides. The range of 226Ra variation had been compared with available data from other countries. The calculated absorbed dose rate ranged from 22.33 to 32.66 nGy?h-1 in lo- cation (B) and (E) respectively, which was less than the accepted value.     

Preparation and properties of 117m Sn(IV)-TTHMP in in-vitro and in small animals

In this work,TTHMP was synthesized and labelled with 117m Sn.The preparation conditions,stability and lipophilicity of 117m Sn(IV)-TTHMP were investigated.Biodistribution of the complex in rabbits and mice was studied.It was found that the quantity of TTHMP and pH value of the prepararion solution had vital effects on the labeling yield of 117m Sn(IV)-TTHMP.It was also found that 117m Sn(IV)-TTHMP was hydrophilic and stable at room temperature and 37℃ in open air 117m Sn(IV)-TTHMP showed unexpectedly high bone uptake and bone-to-blood ratio in the animals.This made it potentially useful as an reagent for skeletal scintigraphy and radiotherapy of bone tumors.     

Gamma radiation levels in the ambient environment of the QNPP Base

Monitoring results of gamma dose rate level in 1992～2004 in the ambient environment of the Qinshan Nuclear Power Plants(QNPP)Base,the northeast of Zhejiang Province,are reported in this paper.It is shown that the gamma dose rate of five monitoring sites of 2.5 km to QNPP Base is 84～113 nGy/h,with an average of 96 nGy/h in the 13 years.The average value is close to the background level of 93 nGy/h prior to operation of the QNPP Base,and is lower than the monitoring result of 101 nGy/h at the reference site in Hangzhou City.Within 50 km from the QNPP Base,the cumulative dose rate of the thermoluminescent dosimeter(TLD)is 90 nGy/h,which is lower than the back- ground level of 111 nGy/h.     

The role of AGFA high-energy CR in the calibration and quality control of multileaf collimators （MLC）

Linear accelerators equipped with multileaf collimators （MLC） are becoming more common and are widely used in the intensity-modulated radiotherapy （IMRT）. There is an imperative need to ensure the commissioning specification of the linear accelerators for the sake of quality assurance （QA） and quality control （QC）. This paper is aimed to investigate the role of AGFA high-energy CR （Computed Radiography） in calibrating dynamic multileaf collimators and evaluating the accuracy of the leaf position. The result shows that AGFA high-energy CR can easily and conveniently be used to calibrate MLC and verify its position. Hence, the application of AGFA high-energy CR is proved to be an accurate and time-saving method for routine MLC QC, especially when MLC calibration adjustments are required.