用INAA法和ICP-MS法对蚯蚓样品作多元素测定比较

用仪器中子活化分析方法对６例蚯蚓样品进行了Ａｓ、Ｂａ、Ｃｄ、Ｃｏ、Ｃｒ、Ｃｕ、Ｆｅ、Ｍｎ、Ｈｇ、Ｒｂ、Ｓｂ、Ｓｅ和Ｚｎ的元素含量测定,并用等离子质谱分析方法和人发标准参考物质进行了比较和核对。结果表明,两种测定方法分析结果相符,大多数元素的相对偏差在±２０％以内。     

糖尿病大鼠组织中微量元素的仪器中子活化分析

使用链脲佐菌素诱导出大鼠的Ｉ型糖尿病（ＩＤＤＭ）模型,以正常大鼠作对照。用仪器中子活化分析法测定了大鼠的肝、肾和胰腺组织中Ａｓ、Ｂｒ、Ｃａ、Ｃｏ、Ｃｌ、Ｃｕ、Ｆｅ、Ｈｇ、Ｍｇ、Ｍｎ、Ｎａ、Ｒｂ、Ｓ、Ｓｅ和Ｚｎ等元素的含量。结果表明,ＩＤＤＭ大鼠模型的这３种组织中的一些微量元素含量发生了明显改变。并对这些元素含量发生变化的原因和意义作了讨论。     

眼晶体中某些元素含量与白内障关系的研究

用中子活化分析法测定了正常人眼晶体及老年性白内障晶体中的Ｋ、Ｃａ、Ｎａ、ＣＩ、Ｓ、Ｓｅ、Ｚｎ、Ｍｇ、Ｆｅ、Ｒｂ、Ｃｓ、Ｃｒ、Ｃｏ、Ｃｅ、Ｍｎ、Ｓｂ、Ｓｃ、Ｅｕ和Ｔｈ等１９种元素的含量，发现在白内障晶体中Ｃａ、Ｎａ、Ｃｌ、Ｅｕ、Ｓｂ、Ｆｅ等元素含量显著高于正常晶体；Ｋ、Ｒｂ、Ｃｓ、Ｃｒ、Ｍｎ、Ｃｏ、Ｓｃ和Ｃｅ等元素含量显著低于正常晶体。其中Ｎａ、Ｃｌ、Ｃａ之间；Ｋ、Ｒｂ、Ｃｓ之间存在显著性正相关。Ｎ     

中子活化分析法作为标准物质元素定值权威方法的研究

中子活化分析全面参量化方法与传统的相对比较法相结合，初步满足了国际标准化组织对标准物质元素定值权威方法的定义。首次担子同中子活化分析法可作为ＲＭ一批元素定值的权威方法。对典型的地质、岩石圈环境有证标准物质ＣＲＭ的分析结果表明：Ａｌ，Ａｓ，Ｃｅ，Ｃｏ，Ｃｒ，Ｃｓ，Ｅｕ，Ｆｅ，Ｈｆ，Ｌａ，Ｌｕ，Ｍｎ，Ｎａ，ｒＢ，ｓＢ，ｓＣ，Ｔａ，Ｔｂ，Ｔｈ，Ｙｂ等２０种元素的的实验测定值与推荐值与误差范围符合得很好，     

中子活化法测定肿瘤小鼠脏器中的元素含量

用仪器中子活化法在微型反应堆上对小鼠的毛、脑、心肝、肾、肺、肌肉、肿瘤等８种组织中Ｂｒ、Ｃａ、Ｃｌ、Ｃｕ、Ｉ、Ｋ、Ｍｇ、Ｍｎ、Ｎａ、Ｓ和Ｖ等１１种元素进行了测定。其中铜的分析利用６５Ｃｕ（ｎ，γ）６６Ｃｕ反应，通过测定６６Ｃｕ的１０３９．６ｋｅＶγ射线强度进行定量。方法可靠性用ＮＢＳ－１５７７（牛肝）、ＩＡＥＡ－Ｈ４（肌肉）、虾粉等标准物质核对，测定值与推荐值相一致。     

家兔髂骨中无机元素浓度和血清生化参量的测定

培育家兔造成骨质疏松模型,用于研究妇女骨质疏松患者骨中无机元素的变化机理,使用中子活化分析技术测定３０例家兔髂骨中无机元素含量。结果表明,实验中Ｆ元素含量较对照组显著增高,Ｍｇ元素含量显著减少,而其它元素如Ｋ、Ｎａ、Ｃａ、Ｂａ、ｍＮ、Ｓｒ在两组之无显著差异。     

人发中微量元素与某些呼吸系统疾病关系的研究

用仪器中子活化法测定了正常人和慢性支气管炎,肺气肿,肺心病患者头发中Ｃａ,Ｍｇ,Ｆｅ,Ｓｅ,Ｃｕ,Ｚｎ等１９种元素的含量。测得患者发中Ｃａ,Ｍｇ含量低于正常人,Ｆｅ,Ａｓ,Ｃｏ等含量高于正常人;慢性支气管炎急发期患者发中Ｃａ,Ｍｇ含量低于缓解期患者,Ｆｅ含量高于缓解期患者,均有显著性差异（Ｐ＜０．０５－０．０１）。人发Ｃａ与Ｍｇ呈高度正相关（Ｐ＜０．００１）。还测定了用于治疗慢性支气管炎的中药“咳     

萃取分离—化学光谱法测定UF4中18种微量杂质元素

应用化学光谱法分析测定了ＵＦ４中的１８种微量杂质元素Ｌｉ、Ｎａ、Ａｌ、Ｍｇ、Ｋ、Ｃａ、Ｍｎ、Ｆｅ、Ｃｕ、Ｃｒ、Ｚｒ、Ｔｉ、Ｍｏ、Ｖ、Ｐ、Ｎｉ、Ｂａ、Ｗ。测定的１８种杂质的质量分数范围为３．２８×１０－１０－１．３１×１０－６；精密度＜２０％；回收率９６．１％－１１１％。     

地球化学标准参考物质港湾沉积物SRM1646均匀度之研究

利用仪器中子活化分析法研究了港湾沉积物ＳＲＭ１６４６中１３种元素（Ａｓ、Ｃｅ、Ｃｒ、Ｃｓ、Ｅｕ、Ｆｅ、Ｈｆ、Ｌａ、Ｒｂ、Ｓｃ、Ｓｍ和Ｔｈ）在５０μｇ至２０ｍｇ样品量范围内的分布均匀性，并计算了它们的取样常数。实验结果表明：元素分布的均匀度与元素本身的赋存状态及取样量有关。     

用中子粉末衍射方法研究Ho2Fe17系列化合物的磁结构

在中子三轴谱仪上用中子粉末衍射方法测定了室温下样品Ａ（Ｈｏ２Ｆｅ１３Ａｌ４Ｃ）、Ｂ（Ｈｏ２Ｆｅ１３Ｇａ４Ｃ２）、Ｃ（Ｈｏ２Ｆｅ９Ｇａ４Ａｌ４）和Ｄ（Ｈｏ２Ｆｅ９Ｇａ６Ａｌ２）的晶体结构和磁结构。衍射数据用Ｉｚｕｍｉ的Ｒｉｅｔｖｅｌｄ分析程序ＲＩＥＴＡＮ进行轮廓精修处理，确定了替代原子Ｇａ、Ａｌ和间隙原子Ｃ的占位及占位数以及磁性原子Ｈｏ、Ｆｅ的原子磁矩的大小和方向。样品Ａ、Ｂ和Ｄ显亚铁磁性，Ｃ显顺磁     

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.     

有效探测面积大于1000 cm2的正比计数器测量系统性能测试

为对自制的活性面积高达1 000 cm²的大面积源进行表面发射率定值,同时作为现有2πα、2πβ表面发射率标准装置能力的扩充,研制了一套内置式大面积2π多丝正比计数器测量系统,并利用活性区直径为8 mm的²⁴¹Am点源及活性区面积为10 cm×15 cm的大面积²⁴¹Am和⁹⁰Sr-⁹⁰Y源对其进行计量学性能测试。结果表明：计数器内计数响应均匀性优于±0.4%,有效探测面积达1 400 cm²;所得²⁴¹Am源高压坪曲线的坪长为1 400 V,坪斜为0.27%/100 V,坪区内计数变化为0.87%;⁹⁰Sr-⁹⁰Y源高压坪曲线的坪长为300 V,坪斜为0.75%/100 V,坪区内计数变化为0.80%;10次测量重复性好于0.4%,8 h内短期稳定性好于0.3%,1 a内长期稳定性好于0.8%。     

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.