| 1. | The breakdown of radioactive isotopes goes on at constant rates .
放射性同位素的衰变在恒定的速率下进行。 |
| 2. | Whole body counter
测定全身放射性同位素的计数器 |
| 3. | Burden of a radioisotope
放射性同位素的含量 |
| 4. | Autoradiography a technique whereby a tin slice of tissue containing a radioactive isotope is placed in contact with a photographic plate
放射自显影术：将含有放射性同位素的一小薄片生物组织与感光层接触的一项技术。 |
| 5. | We can talk about the half - life of a radioactive isotope , and indeed we can measure and state very very precisely what that half - life is
我们可以谈论放射性同位素的半衰期，我们确实可以非常准确地测量和描述半衰期是什么。 |
| 6. | Trace amounts of natural radioactive materials , such as uranium , thorium and potassium with half - lives of up to one billion years , exist in soil
泥土中含有微量的铀、钍和钾等天然放射性物质，这些放射性同位素的半衰期可以长达10亿年。 |
| 7. | Trace amounts of natural radioactive materials , such as uranium , thorium and potassium with half - lives of up to one billion years , exist in soil
泥土中含有微量的铀、钍和钾等天然放射性物质，这些放射性同位素的半衰期可以长达10亿年。 |
| 8. | According to the off - line rnb ' s requirement of the radioactive isotope , the doubly odd nucleus 64cu produced by reactor was chosen as the first nuclide to carry out expermental research about the off - line rnb
按照离线放射性核束对放射性同位素的要求，我们把堆照放射性同位素样品~ ( 64 ) cu作为首选核素来开展离线放射性核束的实验研究工作。 |
| 9. | For radioactive workplace and the transportation and storage of radioactive isotope , the employer should equip risk - prevention equipment and alarm devices , and ensure the employees exposed to radiation equipped with dose meter
对放射工作场所和放射性同位素的运输、贮存，用人单位必须配置防护设备和报警装置，保证接触放射线的工作人员佩戴个人剂量计。 |
| 10. | Among them the x - ray diffraction analysis is mainly used to confirm clay mineral assemblages and their crystallinity ; chemical analysis and electronic microscope are used to study the source , the genesis and the evolvement process of clay minerals ; radioactive isotopes analysis can make up the relationship between the time and space which is based on the climate index and the chronology ; hydrogen and oxygen isotopes also provide important evidence for reconstructing paleoclimate
其中， x射线衍射分析主要用来确定黏土矿物组合及其含量以及某些黏土矿物的结晶度化学分析电镜分析主要用于黏土矿物的来源成因演变过程的研究放射性同位素的研究使气候指标和年代学建立起时间和空间上的联系而氢氧同位素分析亦能对古气候重建提供重要佐证。 |
