摘要：目的:本文针对我国压力管道检测技术的现状,基于透射式工业CT的基本原理,研制开发了一种新型的便携式压力管道在线测厚仪。方法:文中简要阐述了该仪器的具体结构设计,给出了实验室标定实验和管道验证实验的实验数据;结果:实验结果表明用该仪器对实际管道的检测结果是非常精确的,误差在允许的范围之内。结论:该仪器具有结构简单、使用方便、测量精确、反应速度快、安全可靠等优点。

摘要：目的 :通过较长时间随访 ,评估立体定向伽玛刀 (γ 刀 )放射手术对颅脑疾病的疗效。方法 :用 1 5Tesla磁共振仪、CT定位或联合DSA定位脑动静脉畸形 (AVM ) ,并和γ plan计算机联网 ,γ plan 4 0版剂量规划系统作治疗方案设计、剂量规划 ,并用Leksellγ 刀对 30 94例不同类型的颅内疾病包括肿瘤、血管畸形及功能性疾病等实施放射手术、病种达 2 0余种 ,年龄 1 1～ 86岁 ,周边剂量 9～ 75Gy ,中心剂量 18～ 5 0Gy ,等剂量曲线 30 %～90 % ,靶点数 1～ 12个。结果 :随访 31～ 72个月 ,统计结果表明 ,γ 刀疗效是确切的 ,且无明显远期并发症。脑动静脉畸形闭塞率可达 97 3% ,体积越小 ,周边照射剂量越大 ,闭塞越早。颅内肿瘤的生长控制率 ,良性肿瘤≥ 88 8% ,恶性肿瘤≥ 6 6 7% ,功能性疾病的治疗有效率均≥ 90 0 %。结论 :γ 刀立体定向放射手术较常规开颅手术安全 ,痛苦少 ,有效率高 ,是治疗颅内疾病一种较好的方法。严格掌握治疗指征 ,精确定位 ,合理剂量规划 ,并对整个过程实施严格的质量控制 ,可确保疗效 ,降低并发症。

摘要：目的设计靶向survivin基因的干涉片段，构建真核表达载体pSUPER／survivin并转染宫颈癌HeLa细胞，探讨siRNA抑制survivin表达对联合1射线宫颈癌HeLa细胞周期的影响。方法化学合成干涉引物，退火获得survivin基因的干涉片段，连入pSUPER载体并测序。将测序正确的pSUPER／survivin载体转染HeLa细胞株，RT—PCR法和流式细胞术检测HeLa细胞中survivin基因的表达，流式细胞术检测转染联合＇射线照射后各组细胞的细胞周期数据。结果本实验成功的构建了pSUPER／survivin载体。转染pSUPER／survivin的HeLa细胞其survivin基因表达水平明显低于未转染的HeLa细胞及转染空载体pSUPER的HeLa细胞。1射线照射后，转染pSUPER／survivin的HeLa细胞发生了S期细胞比例下降，及G2／M期阻滞。结论成功的构建了pSUPER／survivin载体，siRNA干涉survivin可以作为提高放射敏感性的潜在分子靶点，通过减少S期细胞比例，促进肿瘤细胞凋亡，通过增加G2／M期阻滞增加放射线的杀伤。

摘要：The recent increasing use of γ-rays industrial computed tomography(γ-rays ICT) in various fields has induced greater attention to its performance as well as to considerations of radiation safety. It is understood that radiation protection planning cannot be sacrificed for the sake of CT image quality during the design, manufacture,and layout of γ-rays ICT systems. In the present work, we describe a typical γ-rays ICT system in brief, and, based on experience and pertinent examples, we propose design requirements for ensuring the radiation safety of the sealed radioactive source, source container, and workspace. The design examples and dose rate measurement results illustrate that the proposed design standards are reasonable,feasible, and safe, and are therefore meaningful for the design, manufacture, and layout of γ-rays ICT systems. This paper discussed the predominant measures associated with the radiation protection of γ-rays ICT systems in accordance with the pertinent Chinese standards. In addition, based on experience and pertinent examples, the design requirements for ensuring the radiation safety of a sealed radioactive source, source container, and workspace were defined in detail. The design examples and dose rate measurements conducted in conjunction with a γ-rays ICT system and workspace employing the proposed design standards have illustrated that the proposals provided in this paper are reasonable, feasible, and safe, and are therefore meaningful for the design, manufacture, and layout of γ-rays ICT systems.

摘要：目前,国内外使用的新生儿脐带结扎技术和用具有许多品种,据调查、最常用的有线(带)结扎、气门芯套扎、线缝扎、止血钳夹扎等各种方法。上述方法较烦琐,且工作量大,也不易包扎。我们研究设计了一次性使用的脐带结扎套具。

摘要：上海超奇电子有限公司生产的RM-2021个人剂量报警仪，是采用新型单片机技术设计的智能化、低功耗、液晶显示的袖珍式监测仪器．主要用于监测X射线和γ射线。