放射性核素

The transuranic elements especially the minor actinides in spent fuel represent potential environmental radiotoxicity hazard in the long term.

核电站乏燃料中超铀核素，特别是其中的少数锕系核素（Minor Actinides，简称MA），对环境具有潜在长期放射性危害性。

When the distribution of important fission products is calculated, emphasis is placed on the noble gas radionuclides and upon radioisotope of iodine because of their great contribution to accident dose.

在对重要裂变产物分布的仿真计算中，重点放在了惰性气体核素和碘的放射性同位素上，因为它们是事故中放射性剂量的重要来源。

The stability ofradioactive microspheres can be improved by coating with ploT-L-lactic acid; however,about 60% of the activity leaches from the microspheres in this process, and approximately10% of the activity leaches after washing with saline. Fortunately, 30% of the activityremained stably in the resin microspheres.

体外稳定性实验结果表明：1采用离子交换法制备的放射性树脂微球标记核素脱落严重，使用聚乳酸包被放射性树脂微球可以提高其稳定性，但是包被过程中约有60％核素脱落，生理盐水洗涤约有10％的核素继续脱落，不过剩余的30％稳定存在于树脂微球上。

The liquid radioactive contamination comes from the radioactive substances produced by the circulatory cooled water activated after neutron radiation;the solid radioactive contamination comes from the match plate in the hot working chamber,the collimation equipment...

液态放射性污染主要指加速器冷却循环水受中子照射被活化形成放射性物质；固体放射性污染为热室工作箱内的模板，退役加速器离子源、准直器和靶周围被活化的器件及与放射性制剂分装、注射相关的用品；放射性气态污染，主要指中子使空气活化产生核素11C、13N、15O、41Ar，空气中其它成份被中子活化产额低，多为气溶胶状态；另外放射性表面污染主要指加速器厅内被活化的固体器件，冷却水破裂或放射性药物意外污染，有关传递通道和贮源容器的表面放射性污染。

Methods Neonate rats were irradiated with a single injection of 2 μl enriched*" 235 uranium( 235 U)into the lateral ventricle of the rat brain on the first day of life(less than 24 hours after birth)at doses of 0,1,5 and 10 μg of*" 235 U,respectively.

新生大鼠侧脑室注射 2 μl浓缩铀溶液后，多方位地观察不同浓度的2 35U对早期生长发育的影响，放射自显影示踪术观察脑内放射性核素行径定位。

Objective: To analyze the feature of vertebral metastas is on planar skeletal scintigraphy and evaluate its clinical application.

目的： 探讨脊柱骨转移癌放射性核素骨显像表现及其临床应用。

Objective To establish a new,simple and noninvasive method which can quantitatively analyze the colonic transit function by dual radionuclide colon scintigraphy.

目的 建立一种新的、无创性的放射性核素定量检测结肠运动功能的方法。

Objective:To compare the ability of planar skeletal scintigraphy and MRI in detecting vertebral matastatic foci.

目的：比较放射性核素骨显像（简称骨显像与MRI对脊柱骨转移癌灶的检出情况。

Methods The platelet NO production in 21 hypercholesterolemia patients and 26 normal individuals was assayed by spectrum, the NOS activity and the transportation of L Arg were determined by 3H labelled L Arg.

采用比色法检测 2 1例HC患者和 2 6名健康体检者血小板的NO水平，采用放射性核素(3H L 精氨酸)标记法检测血小板一氧化氮合成酶及L Arg转运系统活性。

A unique copper target design for production of radioactive 〓Zn is presented and it thermal property is tested.

靶材料的研究制备以及放射性核素的释放都是需要解决的关键技术问题。

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。