Theoretical Calculations of All Reactions for n ~(151)Eu,~(153)Eu,~(154)Eu and~(155)Eu in E_n=0.001～20 MeV

All reaction cross sections, secondary neutron spectra and elastic scattering angular distributions of n ~(151)Eu,~(153)Eu,~(154)Eu and ~(155)Eu in E_n=0.001～20 MeV were calculated. Pretty good theoretical results in accordance with experimental data were obtained, and all calculated results are given in ENDF/B-6 format.     

动力堆辐照元件中燃耗测定和~(149)Sm,~(150)Sm含量,~(154)Eu/~(155)Eu,~(154)Eu/~(152)Eu比值与燃耗的关系

本文用同位素稀释质谱法,以~(148)Nd为燃耗监测体对某动力堆元件的燃耗进行了测定。还测定了裂变产物中的高中子毒物~(149)Sm的含量。对~(150)Sm的含量测定结果表明,它能反映出核燃料燃烧的程度,为一直线关系。γ谱法测得的~(154)Eu/~(155)Eu比值和燃耗呈曲线关系。     

~(151)Eu中子俘获截面中~(152)Eu同质异能态贡献的模型检验和分析

~(151)Eu中子俘获截面在反应堆物理以及核天体物理慢中子俘获过程中具有重要的作用,由于~(152)Eu两个同质异能态(m1, 0-; m2, 8-)的贡献,使得生成~(152)Eu基态和同质异能态的中子俘获截面的测量和区分难度增大。利用核反应理论模型程序—TALYS-1.8,计算了中子能量在0.01~20 MeV区间的~(151)Eu(n,γ)~(152)Eu基态和同质异能态的中子俘获反应截面,并与EXFOR截面数据库中已有的实验数据进行比较,检验了现有~(151)Eu实验数据的可靠性。分析表明:由于~(152)Eu基态和第一同质异能态都存在121.8 keV能级的退激,使得它们的截面测量存在较大误差,而基态和第二同质异能态的截面理论值基本与实验值相一致。     

~6(Li )~(208)Pb熔合激发函数测量

~6(Li )~(208)Pb熔合激发函数测量@吴岳伟@刘祖华@林承键@阮明@张焕乔@李志常@杨峰@刘建成     

Activation Cross Section Measurement for the Eu(n,γ) Reactions

The cross sections for ~(151)Eu(n,γ)~(152m)Eu, ~(151)Eu(n,γ)(152g)Eu and ~(153)Eu(n,γ)~(154)Eu reactions have been measured relatively to that of ~(197)Au for neutron energy from 22 to 1100 keV, using the activation technique. Neutrons were generated via the ~7Li(p,n)~7Be and T(p,n)~3He reaction with a 4.5 MV Van de Graaff accelerator at Peking University. The activities after irradiation were measured with two calibrated high resolution HPGe detectors. The accuracy of the measurement is 6～7%. The experiment results were compared with existing data.     

~(90)Sr/~(90)Y前列腺增生治疗机(器)的准产注册

~(90)Sr/~(90)Y前列腺增生治疗机(器)的准产注册@黄伟@简利民@蔡善钰@李安庆@张进富@王海云     

放射源~(152)Eu的能谱识别及和峰特性分析

使用低本底高纯锗(HPGe)探测器测量放射源~(152)Eu的γ能谱,识别能谱中出现的所有峰,分辨出干扰峰,并对和峰的特性进行分析,结合计数率随距离变化曲线以及通过分辨率比较和峰与特征峰的差异,为和峰的辨别提供判据。在和峰效应引起的全能峰计数率减少的情况下,修正各全能峰计数率,计算放射源中~(154)Eu杂质含量,结果显示,与修正前差异较明显,表明在能谱分析尤其是考查全能峰强度数据时,需要进行符合相加修正。     

~(129)I吸收源研制

~(129)I吸收源研制@杜鸿善@李桂花@樊勤@颜素娟     

醋酸纤维素膜上~(153,154)Eu的电迁移

Atizetmuller和Buchtela等采用醋酸纤维素膜(CAM)作支持体研究了希土与α-HIBA体系中的电迁移行为。本文在文献[6]的基础上,对Eu的电迁移行为的影响因素:电解质浓度、端电压、离子强度、电解质的pH、电迁移时间、冷却水温度、原始料液的酸度和外来离子等进行了研究。还测定了采用推荐程序时Eu的电迁移速率、Eu与α-HIBA一级络合物的稳定常数。     

~(86)Y核结构研究

~(86)Y核结构研究@温书贤@王治民@彭朝华@武绍勇@马瑞刚@李广生@袁观俊@杨春祥@竺礼华@郭应祥@周小红$中国科学院近代物理研究所@雷祥国$中国科学院近代物理研究所     

Evaluation and Calculation of Activation Cross Sections for ~(151,153)Eu(n,2n), (n,3n), (n,γ) and (n,x) Reactions below 20 MeV

Eu is a rare-earth element. Its activation cross section is important for nuclear science and technology applications. However, there are some discrepancies in several evaluated nuclear data libraries. The cross section for ~(151,153)Eu(n,2n) reactions were one of the Coordinate Research Programs of IAEA on activation cross sections     

含~(60)Co和~(152)Eu放射性废液的水泥固化配方研究

针对含60 Co 3 8× 10 5Bq/L、152 Eu 6 67× 10 5Bq/L、总放射性活度为 2× 10 7Bq的放射性废液进行了水泥固化配方及工艺试验研究。结果表明 :水泥浆流动度和初凝时间随水灰比增大而增大 ,而固化体的抗压强度则随其增大而降低。优选配方的水泥固化体各种性能均满足中低放废液固化体性能要求 :水泥浆流动度≥ 130mm ;水泥固化体 2 8d抗压强度 >7MPa ;4 2d浸出率60 Co为1 84× 10 - 4cm/d、152 Eu为 2 76× 10 - 5cm/d(剂灰比 0 15 ) ,60 Co为 5 4 7× 10 - 4cm/d、152 Eu为1 5 5× 10 - 4cm/d(无添加剂 ) ;总 β的累积浸出分数 (4 2d)分别为 1 7× 10 - 2 cm(剂灰比 0 15 )和3 5× 10 - 2 cm(无添加剂 )     

Adsorption behavior of ~(241)Am(Ⅲ) and Eu(Ⅲ) by silica/polymer-based isoHex-BTP adsorbent from nitric acid solution

The adsorption behavior of241Am(Ⅲ) and Eu(Ⅲ) by silica/polymer-based iso Hex-BTP adsorbent(iso HexBTP/Si O2-P) was investigated by a batch experiment method. iso Hex-BTP/Si O2-P exhibited high affinity and selectivity for241Am(Ⅲ) over152Eu(Ⅲ) in 2–4 mol/dm3 nitric acid solutions. Within the experimental contact time range of 0.5–24 h, iso Hex-BTP/Si O2-P showed high selectivity for241Am(Ⅲ) compared to152Eu(Ⅲ) in3 mol/dm3 nitric acid solution. However, the adsorption kinetics of241Am(Ⅲ) and152Eu(Ⅲ) was slow. Eu(Ⅲ)adsorption followed the pseudo-second-order kinetic model, indicating chemical adsorption as the rate-limiting step of the adsorption process. And the adsorption agreed well with the Langmuir adsorption model at various temperatures. The adsorption kinetics and isotherm data indicated that the equilibrium adsorption capacity, the adsorption rate, the maximum adsorption capacity and the adsorption affinity, increased with temperature. The thermodynamic parameters, negative change in Gibbs free energy, and positive change in enthalpy and entropy,suggested that the adsorption of Eu(Ⅲ) was spontaneous and endothermic process with an increase of entropy.     

分子电镀法制备~(237)Np核靶

分子电镀法制备~(237)Np核靶@罗旭@刘文杰@倪敬宽     

Eu(Ⅲ)在白云石上的吸附行为

采用静态吸附法研究了Eu(Ⅲ)在塔木素粘土岩主要成分白云石上的吸附行为,探讨了时间、温度、pH值、离子强度、固液比、Eu(Ⅲ) 初始浓度、腐殖酸等因素对吸附的影响。结果表明：Eu(Ⅲ)在白云石上的吸附强烈依赖于溶液pH值。当pH<7时,Eu(Ⅲ)的吸附率随溶液离子强度的增加而减小,表明Eu(Ⅲ)在白云石上的吸附以离子交换为主;当pH>7时,则以内层表面配位反应为主。腐殖酸的加入和温度的升高均会促进Eu(Ⅲ)的吸附,其吸附是一个自发吸热的过程,且较好地符合准二级动力学和Freundlich吸附模型,揭示该过程以化学吸附和非均相吸附为主。上述研究结果还表明白云石在塔木素粘土岩吸附Eu(Ⅲ)的过程中非主导作用,这更好地理解了白云石在塔木素粘土岩吸附Eu(Ⅲ)过程中的贡献,为我国高放废物地质处置库选址及安全性评价提供参考。     

线状~(241)Amγ输出器的制作

线状~(241)Amγ输出器的制作@范国民@张文@刘路@孙霞     

~(29)Ce正宇称态的形状变化

~(29)Ce正宇称态的形状变化@李广生@戴征宇@刘祥安@张兰宽@温书贤@吴晓光@袁观俊@彭朝华@翁培焜@李生岗@杨春祥     

Extraction of Am(Ⅲ) and Eu(Ⅲ) With Tpy-HA/tbb

Synergistic extraction of Am(Ⅲ) and Eu(Ⅲ) is studied with terpyridine (Tpy) in combination with2-bromodecanoic acid (HA) in tert-butylbenzene (tbb). The distribution ratios of Am(Ⅲ) and Eu(Ⅲ) arestudied as a function of a number of parameters such as contact time, the acid concentration in aqueousphase, the concentration of Tpy and HA in the organic phase. The experimental results show that thevalues of distribution ratios of Am(Ⅲ) and Eu(Ⅲ) in Tpy/tbb is small, but after adding HA to Tpy/tbbsystem, the values of distribution ratios D(M), (M=Am(Ⅲ), Eu(Ⅲ)) increase fast. D(M) values increase     

~(85)Zr高自旋态磁转动研究

~(85)Zr高自旋态磁转动研究@温书贤@王治民@吴晓光@彭朝华@李广生@袁观俊@竺礼华@陆景彬$吉林大学物理系@赵广义$吉林大学物理系@郭应祥$中国科学院近代物理研究所@雷相国$中国科学院近代物理研究所     

环境污染物~(152)Eu的体内蓄积特性诱发骨髓细胞突变效应研究

环境中放射性污染物对机体损伤效应的研究有待深入,尤其是在核动力装置运转过程中意外泄漏以及在核试验中释放出的一些重要裂变产物污染机体时所诱发的对组织细胞的突变效应急待研究。因为这是探讨放射性裂变产物的损伤特点、损伤机理以及病理过程发生和发展的重要依据。~(152)Eu在混合裂变产物中是重要裂变产物之一,物理半衰