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radioisotope n.【原子能】放射性同位素。adj.-isotopic

radioite

The basic procedure of an interwell radiotracer test is , to inject a proper radioisotope tagged tracer material into the injector together with the injected fluid ; the tracer material will follow the injected fluid and go through the same path of injection fluid penetrating the formation ; finally the tracer material will be produced at the producer ; then , collecting samples at well head of producer , tracer response can be observed ; by analyzing the response of tracer , the information on dynamics of injection fluid and reservoir geology can be obtained 放射性井間示蹤測試的基本過程是:將一定量合適的放射性示蹤劑介入注入流體,使其通過注入井進入地層并跟隨注入流體穿越地層,最后被采油井采出;通過跟蹤監測示蹤劑在采油井上的響應,獲得注水井-采油井之間流體和地層的信息。

In addition , researchers have shown that low - cost laser accelerators are suitable for many of the same applications as conventional accelerators , such as producing short - lived radioisotopes used in medical diagnostics and generating neutron and positron beams for studies of materials 此外,研究人員也證明,在許多應用上,廉價的雷射加速器都跟傳統加速器有同樣的功用,例如用來產生醫學診斷用的短生命期放射性同位素,或制造檢測物質用的中子與正子束。

Given the decay rate of 26al , the lower initial ratio in the chondrules implies that these objects formed between one million and two million years after the creation of the refractory inclusions ( assuming that the radioisotope was indeed homogeneously distributed in the early solar system ) 以鋁26的衰變速率估計,這些球粒的初始比值較低,表示它們是在耐火包體產生后100 ~ 200萬年才形成(假設鋁26在早期太陽系中確實是均勻分布的) 。

Radioisotope dating of the impact - melt samples ? rocks that melted when an asteroid or comet struck the moon , therefore revealing when an impact occurred ? shows that all these basins formed in a narrow interval between 3 . 9 billion and 3 . 8 billion years ago 利用放射性同位素為撞擊熔融物(在小行星或彗星撞擊月球時熔化的巖石,因此它們能顯示撞擊發生的時間)定年,顯示這些盆地都在39 ~ 38億年前一個很短的時間內形成。

Tgs method can determine quantitatively with high accuracy transuranic nuclides in heterogeneously distributed media with medium - and high - density , and is thus widely used to assay the location and quantity of selected radioisotopes in scraps and wastes within sealed containers 它是專用于準確定量測量中、高密度非均勻分布介質中的放射性核素及其含量,是核設施中可回收物以及核廢物測量分析的主要方法之一。

Scientists already know the ages of the mare flows at the apollo sites from analyzing the radioisotopes in the rock samples , so they can estimate the ages of other flows by comparing their crater densities with those of the landing - site flows 科學家分析巖石樣本中的放射性同位素,已經知道阿波羅登陸點的月海巖流年齡;因此將其他巖流的隕石坑密度與登陸點巖流的隕石坑密度相比,科學家便能估計其他巖流的年代。

Most of earth ' s internal heat is generated by four long - lived radioisotopes ? potassium 40 , thorium 232 , uranium 235 and uranium 238 ? that release energy over billions of years as they decay into stable isotopes 地球內部的熱能主要來自半衰期較長的四種放射性同位素鉀40 、釷232 、鈾235與鈾238 ,它們在幾十億年來逐漸衰變成穩定的同位素,同時釋放能量。

So far , tgs is already a matured technology abroad with various types of tgs setups for determining radioisotopes in the samples with medium - and high - density heterogeneous drummed scraps and wastes 到目前為止,國外tgs技術已基本成熟,而且已研制生產出各種類型的tgs儀器,成功應用于中、高密度非均勻樣品放射性核素及其含量的準確測量分析。

With advanced imaging and computing technologies , a three dimensional picture or animation can be generated to facilitate the diagnostic treatment if radioisotopes are injected or ingested into the patient 運用現時先進的造影技術及電腦科技,只要我們將放射性同位素注入或進食入病人體內,就可以產生立體或動態的影像,從而研究病人的情況。

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 在對重要裂變產物分布的仿真計算中,重點放在了惰性氣體核素和碘的放射性同位素上,因為它們是事故中放射性劑量的重要來源。

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 該公司的老板吉爾蘭說,核廢料中99 . 9 %以上的放射性同位素是重元素,他們的技術就是利用這個事實,而靈感是從核融合研究借來的。

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 傳統的dna分子雜交采用的是放射性標記的檢測方法,這種方法雖然靈敏度高,但存在放射性物質對人體及環境的危害。

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 摘要近年來,放射性核素在腫瘤內照射領域的基礎研究和臨床應用均取得了較大發展。

While the use of ionizing radiation and radioisotopes brings huge benefit to the human society , its potential hazards are also gradually becoming apparent 電離輻射與放射性核素的應用給人類社會帶來了巨大的利益,與此同時其危害亦逐漸顯現出來。

Fertilizers doped with radioisotopes provide a means to find out the amount of fertilizer uptaken by crops and the portion that is lost 將放射性物質加入肥料中,然后量度農作物的放射性,便可以知道有多少肥料被吸收,及有多少流失。

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為- 99m ,它的半衰期為六小時,在衰變過程中放出射線。

Test method for measuring the package attenuation coefficient of a sealed device for radioisotope hermetic test 放射性同位素密封試驗用封裝器件封殼衰減系數的測量方法

Radioisotope laboratories - part 2 : internal radiation protection rules ; examples for application and comments 放射性同位素實驗室.第2部分:內部射線防護原則.應用

Myocardium radioisotope scanning with 99m tc - mibi in the diagnosis of myocarditis 甲氧基異丁基異晴心肌平面顯像對心肌炎的診斷價值