In order to compare the dosimetric properties of two kinds of solid state detectors used for monitoring ex- ternal exposures,experiments were performed for the GD-300 series of radiophotoluminescent glass detectors (R...In order to compare the dosimetric properties of two kinds of solid state detectors used for monitoring ex- ternal exposures,experiments were performed for the GD-300 series of radiophotoluminescent glass detectors (RPLGD)and the GR-200 series of thermoluminescent detectors(TLD).X-rays and ^(137)Cs and ^(60)Coγ-rays were used to irradiate the RPLGDs and TLDs,their dose linearity,uniformity/reproducibility of signal,fading effect and energy dependence were compared.Both kinds of the detectors have generally good dosimetric properties.The dose linearity and energy dependence of the GD-351 dosimeters and the TLDs are nearly the same,but the RPLGD is much better than the TLD in terms of the uniformity and fading effect.展开更多
Ad hoc网络是一种没有中心基础设施、节点间可自由通信的无线对等网络。它的网络性能受网络拓扑变化的影响非常大。为了明确无线信道的衰落特性对其网络性能造成的影响,文章用实际测试的方法对其进行了详细研究。通过搭建无线自组织网...Ad hoc网络是一种没有中心基础设施、节点间可自由通信的无线对等网络。它的网络性能受网络拓扑变化的影响非常大。为了明确无线信道的衰落特性对其网络性能造成的影响,文章用实际测试的方法对其进行了详细研究。通过搭建无线自组织网络实验平台进行了多次室外测试,对接收信号功率强度的变化分析得出节点传输范围的变化特征及其对路由协议性能的影响;对分组投递率的测量得出网络投递率与节点间距离的关系;根据路由切换现象分析了网络运行过程中出现的路由不稳定现象的成因;最后给出了相应的解决方案。展开更多
基金Supported by the National Natural Science Foundation of China(Grant No.10675036)
文摘In order to compare the dosimetric properties of two kinds of solid state detectors used for monitoring ex- ternal exposures,experiments were performed for the GD-300 series of radiophotoluminescent glass detectors (RPLGD)and the GR-200 series of thermoluminescent detectors(TLD).X-rays and ^(137)Cs and ^(60)Coγ-rays were used to irradiate the RPLGDs and TLDs,their dose linearity,uniformity/reproducibility of signal,fading effect and energy dependence were compared.Both kinds of the detectors have generally good dosimetric properties.The dose linearity and energy dependence of the GD-351 dosimeters and the TLDs are nearly the same,but the RPLGD is much better than the TLD in terms of the uniformity and fading effect.
