通过试验，获得了实用转换系数，据此，可以求出每节钴靶的比活度。
Useful conversion coefficient is obtained by test, and therefore axial distribution of cobalt target specific activity is calculated.
结果：不同产地、不同品种的进口花岗岩石材样品中天然放射性核素的比活度与普通建筑材料比有较大差别。
The specific activities of natural radionuclides in import granites of different producing area and different varieties have biggish differences with those in normal building materials.
本文介绍了用(232u)作示踪同位素，测定岩石、土壤、水体中铀同位素及岩石中钍同位素比活度的方法。
This paper presents a determination method of specific activity for uranium isotope in rocks, soil, water and thorium isotope in rocks using 232u as a tracer isotope.
该比对中的三种样品是由一些具有已知核素比活度的标准物质或准标准物质构成，而另一种是活度未知的盲样。
Three samples consisted of standard or quasi-standard substances with known specific activities of some nuclides while the radioactivity of the other sample was unknown.
田表水及表土中125I的比活度随时间而下降，到第60天田表水中125I的比活度下降到只占引入量的019％；
The specific activity of 125I in paddy water and topsoil decreased with time. On the 60th day, the specific activity of 125I in paddy water reduced to 019% of the initial.
多向的循环液流系统，降低了活比，增加了浴液的均匀度。
Multidirectional liquid circulating system decreases bath ratio and increases the uniformity of bath liquid.
建立了CME的有限扩散理论模型，引入了活度系数比、扩散系数校正因子及动力学参数等。
The finite diffusion model of CME was established, the activity coefficient ratio, the diffusion coefficient correction factor and the kinetic parameter were introduced and evaluated.
中子能量用铌锆活度比法测定。
The neutron energies were determined by activity ratios of Nb and Zr foils.
结果：相同条件下3 2子集重建图像的热灶活度比16子集更接近真实值。
Results: The activity of the hot lesion at 32 subset is closer to actual value than that at 16 subset.
结果：相同条件下3 2子集重建图像的热灶活度比16子集更接近真实值。
Results: The activity of the hot lesion at 32 subset is closer to actual value than that at 16 subset.
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