MOSFET模拟特性的电离辐射响应

通过研究６０Ｃｏγ射线对ＭＯＳＦＥＴ的线性特性和输出特性的影响，定性地描述了氧化物电荷积累和Ｓｉ／ＳｉＯ２界面态增加分别与Ｐ－ＭＯＳＦＥＴ和Ｎ－ＭＯＳＦＥＴ的迁移率μ退化、跨导ｇｍ下降以及输出特性曲线漂移等的依赖关系。试验结果表明，对于Ｐ－ＭＯＳＦＥＴ，电离辐照感生氧化物电荷积累和界面态密度增加都将导致器件模拟特性的退化；对于Ｎ－ＭＯＳＦＥＴ，这种退化主要由辐射感生Ｓｉ／ＳｉＯ２界面态密度增加所支配。     

注氟MOSFET的质子辐照效应

对干Ｏ２和Ｈ２＋Ｏ２栅氧化注Ｆ的Ｓｉ栅Ｐ沟和Ｎ沟ＭＯＳＦＥＴ进行了８ＭｅＶ和１２ＭｅＶ质子辐照试验，通过分析阈电压和Ｌｄｓ－Ｖｇｓ亚阈特性的辐射响应，发现ＭＯＳ结构栅介质中Ｆ的引入能明显抑制辐射感生氧化物电荷的积累和Ｓｉ／ＳｉＯ２界面态的产生，导致ＰＭＯＳＦＥＴ较小的阈电压负向漂移和ＮＭＯＳＦＥＴ阈电正向回漂，且不受质子辐照能量的影响。     

EFFECT OF TOTAL IRRADIATION DOSE ON MOSFETs／SOI

ＥＦＦＥＣＴＯＦＴＯＴＡＬＩＲＲＡＤＩＡＴＩＯＮＤＯＳＥＯＮＭＯＳＦＥＴｓ／ＳＯＩＧａｏＪｉａｎｘｉａ（高剑侠）；ＹａｎＲｏｎｇｌｉａｎｇ（严荣良）；ＲｅｎＤｉｙｕａｎ（任迪远）（ＸｉｎｊｉａｎｇＩｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃｓ，ｔｈｅＣｈｉｎｅ...     

P沟MOSFET／FIPOS的γ射线总剂量辐照特性

采用高选择和自终止多孔氧化硅全隔离技术的制备了高质量的ＳＯＩ材料，研究了在该材料上采用２μｍＣＭＯＳ工艺制备的不同沟道长度的Ｐ沟ＭＯＳＦＥＴ的＾６０Ｃｏγ射线总剂量辐照特性，表明经５ｋＧｙ（Ｓｉ）辐照后，器件仍有特性，但阈值电压有较大的漂移，这主要是由栅氧化层中的辐照感生电荷而引起，不同的沟长度ＰＭＯＳＦＥＴ的辐照特性有基本相同，经一段时间室温退火，阈值电压出现回漂。     

ASSESSMENT OF COLLECTIVE DOSE FOR TRAVELLERS BY WATERS

ＡＳＳＥＳＳＭＥＮＴＯＦＣＯＬＬＥＣＴＩＶＥＤＯＳＥＦＯＲＴＲＡＶＥＬＬＥＲＳＢＹＷＡＴＥＲＳＹｕｅＱｉｎｇｙｕ（岳清宇）；ＪｉａｎｇＰｉｎｓ（姜萍）ａｎｄＪｉｎＨｕａ（金花）（ＣｈｉｎａＩｎｓｔｉｔｕｔｅｏｆＡｔｏｍｉｃＥｎｅｒｇｙ，Ｂｅｉｊｉｎｇ...     

栅氧化方式对注FMOSFET电离辐射效应的影响

对氢氧合成和干氧栅氧化后注Ｆ的Ｐ沟ＭＯＳＦＥＥＴ和Ｎ沟ＭＯＳＦＥＴ进行了γ射线辐照试验，比较了两种栅介质注Ｆ的电离辐射响应特性。研究表明，氢氧合成栅氧化后注Ｆ的ＭＯＳＦＥＴ具有较强的抑制辐射感生氧化物电荷和界面态生长的能力。用一个新的模型对实验结果进行了讨论，该新模型中用Ｓｉ－Ｆ结键替代其它在辐射场中易成为电荷陷阱的应力键，并考虑到不同氧化方式导致栅介质本身具有的电子陷阱数、空穴迁移率和氧化时所引     

HFETR辐照靶件设计程序开发

针对高通量工程试验堆（ＨＦＥＴＲ）燃料材料考验的辐照靶件设计，开发了ＧＥＮＧＴＣ－Ｃ程序，可用它进行辐照靶件设计和温度分布计算，程序可对多层包壳材料传热，间隙层（液体或气体介质）传热，气体介质层传热进行了计算，同时，对热导膜率随温度的变化和靶件结构材料的几何尺寸因热膨胀的改变进行修正，原程序由美国ＯＲＮＬ编制，见长于结构严谨流畅和良好的适用性，因此，ＧＥＮＧＴＣ－Ｃ是在原程序的基础上并结合ＨＦＥＴ     

不同工艺生成的Si—SiO2经电离辐照的电子自旋共振研究

采用电子自旋共振（ＥＳＲ）分析技术，较系统地研究了Ｓｉ－ＳｉＯ２体系中点缺陷Ｐｂ和Ｅ＇随氧化工艺、＾６０Ｃｏγ射线辐照剂量和辐照所加偏压的变化关系。实验结果表明：两类Ｓｉ／ＳｉＯ２样品在γ辐照前后均能观察到Ｐｂ缺陷，且γ辐照在Ｓｉ－ＳｉＯ２中产生更多的Ｐｂ缺陷；第一类样品在正电场下辐照将产生Ｅ＇缺陷，在自由场下辐照剂量达５×１０＾４Ｇｙ（Ｓｉ）时才能观察到Ｅ＇缺陷；在辐照后的第二类样品中无Ｅ＇信号     

高能Ar离子辐照单晶Si引起的损伤研究

用１１２ＭｅＶ Ａｒ离子以５０Ｋ的低温辐照了〈１１１〉取向的单晶Ｓｉ后在室温下采用Ｘ射线光电子谱（ＸＲＳ）、电子顺磁共振（ＥＰＲ）和红外光吸收（ＩＲ）技术对样品进行了分析。ＸＰＳ分析结果表明，表面处Ｓｉ以单元素和ＳｉＯ２两种形式共存，辐照对这两种形式Ｓｉ的２ｐ轨道电子的结合能影响较小。ＥＰＲ测量结果显示，Ｓｉ中的损伤产生明显地依赖于辐照剂量，当剂量为１．０×１０＾１４－１．８×１０＾１４ｃｍ＾－２     

STUDY ON OCCURENCE FORM OF PLATINUM IN XINJIE Cu－Pt DEPOSIT BY NAA AND SCANNING PROTON MICROPROBE

ＳＴＵＤＹＯＮＯＣＣＵＲＥＮＣＥＦＯＲＭＯＦＰＬＡＴＩＮＵＭＩＮＸＩＮＪＩＥＣｕ－ＰｔＤＥＰＯＳＩＴＢＹＮＡＡＡＮＤＳＣＡＮＮＩＮＧＰＲＯＴＯＮＭＩＣＲＯＰＲＯＢＥＬｉＸｉａｏｌｉｎ，ＺｈｕＪｉｅｑｉｎｇ，ＧｕＹｉｎｇｍｅｉ，ｗｕＸｉａｎＫａｎｇ（Ｓ...     

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.     

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.     

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.