放射性核素

In the International System of Units, the unit of radioactivity becquerel Harrell, called becquerels, symbol Bq, 1Bq equal to 1 second of radionuclides in the nucleus occurred within a decay, that decay 1Bq = 1 times / sec .

在国际单位制中，放射性活度的单位为贝可勒尔，简称贝可，符号为Bq，1Bq等于放射性核素在1秒钟内有1个原子核发生衰变，即1Bq=1次衰变/秒。

A kind of in-situ measurement method is introduced in this paper, by which the radioactivity in the clayey sand of ground surface contaminated by radioactive particulates can be investigated.

本文简要介绍一种对放射性微粒污染的地表砂土中放射性核素活度的就地测量方法。

Environmental treatment and monitoring must be done after decommission of uranium mill tailing impoundment.

铀尾矿库退役后要进行环境治理和长期监测，对库中放射性核素进行模拟可以为放射性废物安全管理提供科学依据。

Based on theoretical calculation and in-situ test results,distribution and emissions of radioactive nuclides of uranium tailings impoundment and waste rock pile sites are analyzed in this paper.

本文从理论计算和现场实测入手，分析了铀尾矿废石场放射性核素的分布、排放量，指出氡是铀尾矿废石场中的主要核素，是公众剂量的主要贡献者。

Conventional radiochemical methods such as alpha spectrometry, neutron activation analysis, liquid scintillation system, fission track and gamma spectrometry for the quantitative determination of neptunium and plutonium often require complicated and time-consuming sample preparation and separation procedures.

研究环境中铀、镎、钚等长寿命放射性核素的精密测定，对保护公众安全和保护环境，对了解核设施的历史操作情况和现状，都具有重要意义。环境样品基体复杂，铀、镎和钚等锕系元素含量非常低，在复杂的生态条件下，这些核素常常具有复杂多变的化学形态，要准确测定其含量，必须要有灵敏可靠的检测方法。

Because of the administration and equipment, the radiation accident in which radioactive nuclide and rays do harm to the public or the workers directly or indirectly occurs sometimes.

由于管理或设备的原因，核技术应用中放射性核素、射线直接或间接对工作人员或公众的健康、安全造成危害的放射性事故时有发生。

Tp the time required for one-half of the atoms in a group of radioactive atoms to decay.

放射性药物radiopharmaceuticals是指药物的本身含有放射性核素，用于人体疾病的诊断与治疗的特殊药物。

As a special treatment modality, radionuclide therapy is characterized by radioactivity throughout the treatment procedure.

放射性核素治疗的特点在于该治疗技术的整个过程都具有放射性。

Using environmental radionuclide 210Pb to study the soil erosion and sediment had great application value and potential. When the nuclide was settled on the surface with atmosphere, it was absorbed by the soil particle quickly. The soil erosion rate on the scale of 100 years was traced through the remotion of nuclide in soil and its regular distribution nude.

利用环境放射性核素210Pb来研究土壤侵蚀和沉积具有很大的应用价值和潜力，当核素随大气沉降到地表时，迅速被土壤颗粒吸附，通过其在土壤间的移动和有规律的分布模式可以示踪100年尺度上的土壤侵性速率。

The prediction of the concentration of radioactive nuclides is the basis and premise of emergency action and radioprotection.

放射性核素浓度的确定是放射性事故抢险救援和辐射防护等工作的基础和前提，是放射性事故应急救援的重要组成部分。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。