Test method for measuring the package attenuation coefficient of a sealed device for radioisotope hermetic test 放射性同位素密封试验用封装器件封壳衰减系数的测量方法
The most widely used diagnostic radioisotope is technetium - 99m which has a half - life of six hours and releases 常用的放射性同位素为- 99m ，它的半衰期为六小时，在衰变过程中放出射线。
Fertilizers doped with radioisotopes provide a means to find out the amount of fertilizer uptaken by crops and the portion that is lost 将放射性物质加入肥料中，然后量度农作物的放射性，便可以知道有多少肥料被吸收，及有多少流失。
Fertilizers doped with radioisotopes provide a means to find out the amount of fertilizer uptaken by crops and the portion that is lost 将放射性物质加入肥料中，然后量度农作物的放射性，便可以知道有多少肥料被吸收，及有多少流失。
While the use of ionizing radiation and radioisotopes brings huge benefit to the human society , its potential hazards are also gradually becoming apparent 电离辐射与放射性核素的应用给人类社会带来了巨大的利益，与此同时其危害亦逐渐显现出来。
While the use of ionizing radiation and radioisotopes brings huge benefit to the human society , its potential hazards are also gradually becoming apparent 电离辐射与放射性核素的应用给人类社会带来了巨大的利益，与此同时其危害亦逐渐显现出来。
This article briefly describes the advancement of application of radioisotope in tumour brachytherapy , mainly on the aspects as below : applied fields , kinds of isotope and marked drugs etc 摘要近年来，放射性核素在肿瘤内照射领域的基础研究和临床应用均取得了较大发展。
The signal provided by the probe is a measure of the degree of hybridization . traditional dna probes are labeled with radioisotopes i . e . 32p , i25i , 3h or 35s 传统的dna分子杂交采用的是放射性标记的检测方法，这种方法虽然灵敏度高，但存在放射性物质对人体及环境的危害。
The technique , which borrows from fusion energy research , takes advantage of the fact that 99 . 9 percent of the radioisotopes in the waste are heavy elements , says company head john r 该公司的老板吉尔兰说，核废料中99 . 9 %以上的放射性同位素是重元素，他们的技术就是利用这个事实，而灵感是从核融合研究借来的。
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。
