查询词典 radioactive source

The decay of ~(99m)Tc source was used to verify experimentally that in the measurement of the number of atoms of a radioactive isotope in a sample at time t_0, the error introduced through the inaccuracy of its decay constant can be reduced to a much smaller value by the careful selection of the time of measurement or measurements of its radioactivity at around one life time (1/λ) after t_0 and doing the calculation.

本文用~(99m)Tc源的衰变实验证明了：在测量一个样品中在t_0时的一种放射性同位素的原子数时只需精心选择一次或多次测量其放射性的时刻在t_0后约该同位素的一个寿期(1/λ)，并进行计算，则由它的衰变常数或其半衰期(T1/2)的不准确性而引进的误差可以被降低到较小值。

This paper describes the main source、storage、management and disposal of radioactive waste and spent sealed source in Tsinghua University.

该文介绍了清华大学放射性废物的主要来源以及放射性废物的存贮、管理和处置。

This paper introduces the advantages of ISOCS measurement method by efficiency calibration without a radioactive source , comparing with traditional measurement methods of environment samples.

ISOCS系统[1](In-SituObjectCountSystem)是由美国Canberra公司开发的现场物体计数系统，它能够在放射性剂量产生地，现场条件下直接进行γ能谱测量和分析。

A unit strength of a radioactive source equal to one million disintegrations per second .

放射性强度单位等于每秒百万次数衰变。

A sort of silicon diodes were irradiated by electron beam and 63Ni radioactive source, and their electrical capabilities were measured during the irradiation.

本工作采用加速器产生的不同能量电子束和63Ni源的β射线对硅基PiN结型器件进行辐照，在线测量了其电学输出性能。

Monitoring scope was divided to 3 zones including radioactive source, operating and denuded, all monitoring results were recorded and archived.

将监测范围划分放射源区、操作区和清洁区共3个区，监测结果记录存档。

A novel isotopic mould measurement system for molten steel level,composed of a radioactive source,a nuclear detector and a signal processing unit,is presented.

同位素检测是恶劣环境下测量液位的主要方法，本文介绍一种新型结晶器钢水液位测量系统，系统由放射源、核辐射探测器和信号处理单元组成。

Ray pinhole imaging system is a major approach to diagnose the radioactive source.

γ射线针孔照相系统是用于诊断γ射线源或X射线源图像的重要手段，它主要由厚针孔、闪烁体、微通道板像增强器和CCD相机等器件组成。

The detection efficiency was also obtained experimentally using radioactive source 60Co.

测出的线衰减系数是绝对值，成像只要求低分辨。然而，TGS有CT测量所没有的发射测量和图像重建的问题。

The Middle Proterozoic Caiziyuan peridotite was formed in the epicontinental basin at the ocean-land boundary or within-continent rift basin. Its mantle source could be metasomatized by the dehydration fluid of subducted plate, and much initial radioactive 〓Nd was added to the source.

中元古代菜子园橄榄岩形成于洋陆交界的陆缘盆地或与大洋相连的陆内裂陷盆地，其源区可能受到俯冲板块脱水流体的交代作用，有大量初始放射性〓Nd加入。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。