~(67)Ga-C_(60)(OH)_x标记条件的研究

用^67Ga标记了水溶性富勒烯衍生物富勒醇（C60（OH）x）。研究了反应时间、温度、pH值、C60（OH）x的质量浓度等对标记率的影响。研究结果表明，反应时间在3-60min时对标记率影响不大；反应温度对标记率基本无影响；pH值大于12后，标记率较低；C60（OH）x的质量浓度高于5μg/μL时，标记率均在94%以上。稳定性研究结果表明，标记后稀释与不稀释的溶液在放置200h后，其放化纯度都达90%以上。     

~(99)Tc-mMIBI和~(99)Tc~m-tetrofosmin在肿瘤细胞的摄取和在荷瘤小鼠体内的分布

研究了小鼠黑色素瘤细胞B16、骨髓瘤细胞SP2/0和小鼠正常成纤维细胞ME对∧99Tc∧m-MIBI和∧99Tc∧m-tetrofosmin的摄取情况。结果表明，小鼠黑色素瘤细胞B16、骨瘤瘤细胞SP2/0对∧99Tc∧m-MIBI的摄取量高于∧99Tc∧m-tetrofosmin，小鼠正常成纤维细胞ME对∧99Tc∧m-MIBI和∧99Tc∧m-tetrofosmin的摄量都很低。研究了∧99Tc∧m-tetrofosmin在接种这两种肿瘤细胞后的小鼠体内的生物分布。     

利凡诺法测定HNO3—H2C2O4混合液中的NO∧—2

用利凡诺（Rivanol）法研究并测定HNO3氧去除了TRPO流程Np、Pu反萃液中H2C2O4时产生的NO∧-2。实验在0.48mol/L HCl介质中，利用Rivanol溶液与NO∧-2生成樱红色配合物性质，用分光光度法测定，结果表明，质量比R（NO∧-3/NO∧-2）≤3.6×10∧4和R（C2O∧2-4/NO∧-2)≤4×10∧3时，均对NO∧-2的测定无影响，方法对NO∧-2的检测下限为0.02mg/L，相对标准偏差为3%，重加回收率为97%～105%。     

在用于大型螺旋装置中性束注入系统的1／3比例氢负离子源中Cs沉积的优化

利用一个紧凑的铯沉积系统对用于大型螺旋装置-中性束注入（LHD-NBI）系统的1/3比例氢负离子源的内表面进行直接的沉积，试验了在3-200mg范围内小的、很确定的铯量的沉积，在纯氢运行模式和有铯模式下都进行了负离子的引出和加速。对等离子体室单纯的3-30mg的铯沉积使H∧-产额暂时增高2-5倍，但是在几个放电脉冲之内该产额又降低到原先的稳态值。在3-5h/60次放电间隔之内连续两次的30mg沉积，产生了类似的H∧-的瞬时增长，但达到很大的H∧-产额的稳态值。在20-120h/150-270次放电的间隔内，更大量的0.1-0.1gGs的沉积，在一个长的运行周期（2-5d）内改善了H∧-产额。对等离子体室各个壁的定向的Cs沉积表明了近似同样的H∧-的增加。对被水泄漏污染的表面沉积0.13gGs产生了与单一30mg铯沉积时相类似的H∧-的瞬时增加和H∧-的稳态水平，用铯等离子体的0.1g沉积得到了用相同量的铯原子沉积时获得的H∧-产额的一半。与在相同的放电功率下12根灯丝运行相比，在8根灯丝的放电运行期间记录到更高的稳态H∧-流值和更小的H∧-产生速率。     

固相微球法人IgG放射免疫分析试剂盒的研制

采用氯胺T法标记的人∧125I-IgG与人IgG（标准品或样品中人IgG）竞争结合人IgG微球抗体，直接离心分离，用于测定样品中人IgG含量，经方法学鉴定，其灵敏度为0.3mg/L，回收率为100%～110%,零管结合率为60%～80%,非特异结合率〈2.5%，测量范围为1.0～50.0mg/L，批内变异系数为3.1%～5.4%，批间变异系数为4.5%～7.2%，温育时间为1h。     

分子镀法制备厚镅（∧241，243Am）靶

研究了异丙醇-硝酸介质中镅（∧241，243Am）的分子镀过程和实验条件，在保持电压为550V、电流密度为4～6mA/cm∧2的条件下电镀1h，通过一次分子镀过程就能在薄铝箔（厚度7μm）初底材料上制备出厚度为0.6～1.2mg/cm∧2的∧241,243Am靶。     

某退役铀矿环境放射性现状调查

介绍了对安徽省某退役铀矿的环境放射性现状调查。调查结果表明：尾渣掩埋坑周围的γ辐射空气吸收剂量率远高于安徽省天然放射性水平调查值，原铀水冶厂遗址处种植的青菜，黄豆中∧238U的含量高出对照占业个量级。土壤样品中的放射性核素∧238U、∧226Ra、∧232Th、∧40K的含量均高于安徽省土壤放射性核素的平均含量，部分采样点的∧226Ra含量超过国家标准。     

多巴胺D2受体显像剂∧99Tc∧m—MBZM的合成及生物性能评价

本工作以舒必利（Sulpiride)为分子模型，在芳环的5位上引入巯基（替代磺酰胺基）合成了（S）-（-）-5-巯基-N-［（1-乙基-2-吡咯烷基）甲基］-2-甲氧基苯甲酰胺［简写为MBZM］左旋异构体。通过“3 1”（二元混合配体络合）方案，合成了一种新的D2受体显像剂∧99Tc∧m-MBZM,其在大鼠体内的生物分布实验结果显示，∧99Tc∧m- MBZM在血液中的清除较快，30min后降到0.444%ID/g；在肝和肾脏中的放射性则持续较高，30min后仍分别达2.184%ID/g；在脑中的摄取量偏低，2min时仅为0.145%ID/g，因此∧99Tc∧m-MBZM不能作为脑受体显像剂。     

90Y的碘油萃取法标记

碘油（碘化油）由于能选择性积聚在肝肿瘤区域，所以在肝癌内介入治疗中发挥越来越重要的作用，为了提高核素对碘油的标记率，本工作采用了一种新的萃取式碘油标记方法，在标记稳定核素Y时，选择P204 、P507、Cyanex 272、壬酸、环烷酸、油酸和8-羟基喹啉等作为萃取剂，在一定的条件下，P204作为萃取剂时钇的标记率达到99.9%，P507和Cyanex 272作萃取剂时也有比较高的标记率，而其他的萃取剂标记率很低。用该法标记核素90Y后，标记物在生理盐水中很稳定，损失率仅为0.01%～0.14%     

极化分析中的自旋进动及其修正

叙述了在∧粒子的极化分析中，∧粒子的自旋磁矩与磁场相互作用时所引起的自旋进动。设计了一个新的处理方法。分析了自旋进动对∧粒子的极化度造成的影响以及对极化度进行修正，并应用于实际数据分析中。     

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.     

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.     

微型X射线管空气比释动能和能谱的测量

为研究微型X射线管的特性,通过电离室测量光管出射口30 cm远处的空气比释动能,使用高纯锗探测器分别测量了Ag过滤和Cu过滤下的X射线能谱。结果表明,空气比释动能随电流的增加有线性增加的趋势,能谱图明显的观察到银的两个特征X射线。完成了微型X射线管空气比释动能和能谱的测量方法以及实验测量的工作,为微型x射线管下辐射质的建立提够了条件基础。     

Gamma-ray attenuation technique for measuring void fraction in horizontal gas-liquid two-phase flow

The measurement of void fraction is of importance to the oil industry and chemical industry. In this article, the principle and mathematical method of determining the void fraction of horizontal gas-liquid flow by using a single-energy γ-ray system is described. The γ-ray source is the radioactive isotope of 241Am with γ-ray energy of 59.5 keV. The time-averaged value of the void fraction in a 50.0-mm i.d. transparent horizontal pipeline is measured under various combinations of the liquid flow and gas flow. It is found that increasing the gas flow rate at a fixed liquid flow rate would increase the void fraction. Test data are compared with the predictions of the correlations and a good agreement is found. The result shows that the designed γ-ray system can be used for measuring the void fraction in a horizontal gas-liquid two-phase flow with high accuracy.