Standard guide for determination of neptunium - 237 in soil 测定土壤中镎237的标准指南
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Standard test method for measuring reaction rates by radioactivation of neptunium - 237 用镎237的放射激活性测定反应速率的测试方法
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Nuclear energy . technology of nuclear fuel cycle . determination of neptunium in nitric acid solutions by molecular absorption spectrophotometry 核能.核燃料循环技术.分子吸收分光光度法测定硝酸溶液中的镎
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Adsorption distribution coefficients increase with the increasing of temperature . the concentrations of redox reagents have light effects on adsorption within the studied concentration range 测定了硝酸溶液中三种价态的镎在硅胶上吸附的等温线和表观吸附热。
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The path - way controlling of neptunium in co - decontamination step of purex process , the extraction thermodynamics of amido podand and its usage in recovery of actinides from simulated hllw have been investigated . more than 95 % np were maintained in np ( v ) in 1a extractor and flowed into 1 aw , if enough amount of hno2 was added in feed adjustment and then hno2 scavenger ( urea ) was added before extraction . three kinds of amido podand were synthesized , and the extraction of lanthanides , actinides and some fission products were studied . one of them ( tbopda , n , n , n ' , n " - tetrabutyl - 3 - oxa - pantenadiamide ) was used as extractant to recover actinides from hllw . the results of experiments show that more than 99 . 99 % actinides were recovered from hllw and separated basically in groups . the main digests are as follows : 1 镎走向控制研究中通过调价阶段加入亚硝酸、而萃取前清除亚硝酸的独特办法可以将大于95的镎赶入1aw 。合成了三种酰胺荚醚萃取剂，研究了它们对锕系和裂片元素的萃取热力学，通过条件实验选择了其中一种荚醚tbopda ( n ， n ， n ’ ， n ’ ?四丁基? 3 ?氧戊二酰胺) ，进行了从模拟高放废液中分离锕镧系元素的工艺研究，锕系的回收率大于99 . 99 ，并且基本上实现了锕镧元素的组分离。其要点如下： 1
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The adsorption isotherm of neptunium on silica gel correspond to the form of langmuir isotherm . according to clausius - claperon equation , from the slope in inkd vs 1 / t plot , adsorption heat could be estimated . from the data of adsorption heat it is concluded that the adsorption of neptunium on silica gel in nitric acid solutions belongs to chemical adsorption and the adsorption process is an endothermic reaction 三种价态的镎在硅胶上吸附的等温线符合兰格缪尔吸附等温线的形式，是单分子层吸附；根据克劳修斯-克拉柏龙方程，以1nkd对1 t作图，通过直线斜率计算出吸附热，从吸附热的数据可判断三种价态的镎在硅胶上的吸附属于化学吸附，是吸热的过程；对npov ） 、 np （ v ）和np （ vd在硅胶上的吸附进行了比较，提出了三种价态的锋在硅胶上吸附的机理。
