放射性核素

This is because radioactive nuclear elements are formed in the giant outbursts of energy, and some of these decay by releasing positrons.

这是因为放射性核素在这巨大的爆炸能量中形成，其中一些放射出正电子而衰变。

The migration of radioactive nuclides in groundwater is the one of most important problems in environmental geosc...

放射性核素在地下水中迁移的研究是当前环境地球科学的一个热点课题。

The migration of radioactive nuclides in groundwater is the one of most important problems in environmental geosciences at present.

放射性核素在地下水中迁移的研究是当前环境地球科学的一个热点课题。

As a result of nucleus test and nucleus electricity station building in developed countries,the pollution of radioactive nuclides to environment has been concerned in the world.

由于发达国家的核试验和核电站的建设，放射性核素对环境的污染已引起世界各国的关注。

The radioactive nuclides produced by these reactions may cause internal exposure to maintenance workers.

灰尘活化产生的放射性核素可能引起检修工作人员的内照射。

Study on dynamical behavior of nuclides transportation in subsurface flow is a critical part of a performance assessment for an underground repository for radioactive waste.

研究放射性核素在地下水环境中传输的动力学行为是评价核废料处置库安全性能的一个关键性问题。

Contaminants and pollutants studied included toxic heavy metals, organic pesticides, oil, and radio nuclides.

污染物和污染源的研究包括有毒重金属、有机杀虫剂、石油、放射性核素。

Key words: head and neck neoplasms;nitriles;radionuclide imaging

头颈部肿瘤；腈类；放射性核素显像

After 16 weeks treatment there are different improvements in patients'clinical expression, pain symptoms, blood sedimentation test in laboratory, CRP test and wrist joints' bone video picture ROI with isotope 99Tcm-MDP.

经16周初步临床治疗应用中，患者在临床表现、疼痛症状和实验室血沉测定、CRP测定和腕关节放射性核素99Tcm-MDP骨显像ROI测定均有不同程度的改善。

The paper presents a new filling-sample method by which the sample quantity filled in a box depends on the energies of γ-rays to be measured. The detection efficiencies of HPGe detector were calculated by using Monte-Carlo method for various γ-ray energies and at various soil sample quantities in a box, and the optimal filling-sample quantities for different-energy γ-rays from radioactive nuclides of 238U, 232Th, 226Ra, 40K, are respectively obtained.

本文提出了样品装量与待测γ射线能量有关联的装样方法，并用蒙特卡罗方法模拟计算了不同能量γ射线的探测效率与样品装量之间的关系，得到用HPGe γ谱仪分析238U、232Th、226Ra和40K等放射性核素活度各自的最佳装样量。

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。