放射性

This paper primarily presented the radioactive characteristics about the strata in Qiangtang basin and the granite in southeast outside of basin based on the following data, radioactivity gamma-ray spectrum survey in field, some chemical analysis data of granite, car-borne gamma-ray spectrometry made by other geological department, and a few regional investigation material so on.

以野外放射性能谱测量数据和部分化学分析数据为基础，结合其他部门在该区的汽车能谱测量数据和少量区调数据，对羌塘盆地出露地层及其东南外围地区花岗岩的放射性特征进行了初步分析。

EXPERIMENT 1 Objective To study the regularity of the injury of the mice learning and memory ability, after the whole brain irradiation. Method After anaesthetized with thiopentone, the whole brain of Kunming mice was irradiated with 10MeV electron beam. Mouse learning and memory ability were measured with step down method on the first, second, third, fourth, fifth, fourteenth, twenty-eighth, fifty-sixth and eighty-fourth day after the irradiation.

随着现代放疗技术及计算机、分子生物学等相关学科的快速发展，肿瘤疗效逐步提高，脑等晚反应组织的放射损伤越来越受重视，因而有必要采用动物实验及分子病理学手段，深入研究放射性脑损伤的发病机理和早期症状，以及活血化瘀中药的防治作用，为此我们设计并完成了学习记忆力放射损伤规律、脑室管膜下区细胞凋亡及相关基因表达、中药防治放射性脑损伤及分子机理三个实验，介绍如下：实验一目的研究照射后鼠学习记忆力损伤变化规律。

Activity exceeds 75 becquerels of parent radioactive chemical element per gram of substance.

成的任何物质，或包含该等元素的任何物质，而其放射性比，以每克物质计算，超逾75贝克耳的源放射性化学元素。

Activity exceeds 75 becquerels of parent radioactive chemical element per gram of substance.

或包含该等元素的任何物质，而其放射性比，以每克物质计算，超逾75贝克耳的源放射性化学元素。

In recent years, the quantities of PET centers in China increased dramastically, and more than 30 PET centers were established, in which cyclotrons, hotcell and PET scanners were included.

由于PET中心在运行过程中，需要处理大量的放射性问题，因此，很有必要对PET中心运行中涉及的放射性进行系统、全面的监测、分析和讨论，并提出合理的建议，以加强辐射防护措施，保证人员的安全。

Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.

&几种氡的同位素的放射性气体，是放射性物质衰变的产物。&

The decontaminating experiments of radioactive surface contamination are carried out with polymer mambrane decontaminating material which can be denuded at a uranium mill and with chemical decontaminating agent at a uranium mine.

介绍了在某铀水冶厂厂区内用可剥离聚合物成膜去污材料和在某铀矿用化学去污剂分别进行的放射性表面污染去污试验，讨论了试验结果，对我国铀矿冶放射性表面污染去污提出了建议。

Definition of package and packaging Regarding the definition of the term 'package', the components of a typical shipment for radioactive material could be basically classified as: radioactive material container body with lid and devices permanently fixed to it (e.g. trunnions, fixed inner structure to hold the content) inner equipment not permanently fixed to the container body (e.g. cans, inner containers) equipment outside the container body used during handling and transport but not permanently fixed to the container body (e.g. a transport frame) conveyance.

定义封装和包装关于这一术语的定义'包'，各组成部分的一个典型的货物的放射性物质可以基本上划分为：放射性物质集装箱的机构，盖子和设备永久固定给它（例如trunnions ，固定举行内部结构的内容）内的设备不会永久固定在集装箱机构设备以外的机构使用的集装箱装卸和运输过程，但不会永久固定在集装箱机构运输工具。

The use of radioactive tracers to study biological processes.

由于新的、更强的放射性物质，特别是镭的发现使放射性研究取得了飞速发展。

SEM examination showed that the experimental group has regular spongiest structure,complete bone lacuna structure,partial broken os-teone and visible bone canaliculus, while the sham control group has disorderly structure, broken osrteone, little bone lacuna and total invisibility of bone canaliculus.

结果 X线片示A组右侧股骨头骨密度增高，透光区较小，B组骨密度减低，有大小不等透光区；ECT扫描示A组静态放射性分布中等浓聚，而B组静态图像放射性分布呈炸面包圈样改变，欠均匀；组织学检查显示A组骨空陷窝率、血管数、骨髓腔内脂肪细胞直径较B组明显改善(P＜0.01)；扫描电镜检查显示A组松质骨结构较规则，骨陷窝结构完整，部分骨板断裂，骨小管可见。B组结构紊乱不清，骨板断裂，骨陷窝少，骨小管消失。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。