放射率

The elution yield of 188 Re is more than 70 % during a period of three months.

188Re的淋洗效率在 3个月之内大于 70 %，188W的漏穿率小于 10 - 4%，核纯度和放射化学纯度均大于 99%。

According to the electrophilic substitution of α-Allocryptopin by ICl, it can be suggested that there are competitions of n-donors (such as N and O atom occurred in alkaloid or solvent molecules) with the conjugated π system in alkaloid molecule for iodine monochloride when charge-transfer complexes are formed, which may block the formation of pre-reactive π-complex intermediate, and thus suppress the electrophilic substitution.

这一方法标记过程简便，标记产物富集于有机相，易于进一步纯化，其放射化学纯度接近95%，标记率超过70%；ICl与α-别隐品碱的亲电碘化反应结果表明，生物碱底物或溶剂分子中的N、O等n电子给体可能与亲电试剂形成电荷转移络合物，竞争芳香亲电取代反应π络合物反应前体的形成，从而抑制碘化反应的发生。

The investigation on radioactivity level s of radioactive source storehouses and surrounding environment were conducted in logging CO.

对大庆测井公司放射源库及周围环境的放射性水平进行了调查，调查内容分为环境空气气溶胶辐射水平、水环境辐射水平、环境地表γ辐射空气吸收剂量率及土壤环境辐射水平四个方面。

The investigation on radioactivity levels of radioactive source storehouses and surrounding environment were conducted in logging CO.

对大庆测井公司放射源库及周围环境的放射性水平进行了调查，调查内容分为环境空气气溶胶辐射水平、水环境辐射水平、环境地表γ辐射空气吸收剂量率及土壤环境辐射水平四个方面。

In order to measure the mould level more quickly and accurately, the algorithms for real-time signal processing are developed to determine the pulse count rate, filter the signal and to compensate the decay of the radioactive source automatically.

为提高测量的统计精度和快速性，设计了信号实时处理算法测量信号脉冲计数率，进行信号滤波和放射源衰减自动补偿。

Results The corrected radiochemical yield was about 54%, and the chemical and radiochemical purity was above 95% by high-performance liguid chromatograph...

结果放射化学产率约为54％，用TLC法和HPLC法测定化学纯度均大于99％，放化纯度均大于95％，18F－FDG各项质量控制指标符合药典要求。

The fractal theory is discussed used in urban spatial morphology. From the psychologic cognition mechanism aspect, according to cognitive superincumbent process, the indexes system and research frame for quantitatively descriptive urban spatial morphology are constructed.

基于以上研究，笔者探讨了网络分析和特征值分析中的主要指标，即对线状要素描述的主要指标有：方向均值、关联矩阵、邻接矩阵、回路数H、β指数、α指数、γ指数等，对面状要素描述的指标有：圆形率、紧凑度、形状系数、标准面积指数、放射状指数等；并探讨了分形理论在城市空间形态研究中的应用，在此基础上，从心理学的认知机理出发，按照自上而下的认知过程构建了定量描述城市空间形态的指标体系和研究框架。

One of the most important problems needed to be solved rapidly is the high rate of restenosis after angioplasty.

血管成形术后较高的再狭窄率是血管介入放射学发展亟待解决的重大问题。

The quantitative autoradiographic 2-(14C)-deoxy-D- glucose methods were used to assess the local cerebral glucose utilization in 46 brain structures in rats suffering from heatstroke.

利用2-(14C)-去氧葡萄糖自动放射显影定量法，分析了大白鼠热中风后脑部46个神经核的葡萄糖代谢率。

In this study, Lucien Duijm, MD, PhD, from Catharina Hospital, in Eindhoven, the Netherlands, and colleagues evaluated the effect on cancer detection rates and overall accuracy of mammography readings if readings by 2 technologists were added to the standard examination by 2 radiologists.

这项研究中，荷兰Catharina医院的Lucien Duijm医师和同事评估，增加两位技术专家与原有的两位放射专家一起进行乳房摄影判读，对癌症侦测率和整体准确度的影响。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。