共查询到19条相似文献,搜索用时 62 毫秒
1.
2.
研究了用212Pb、212Bi和212Pb-212Bi平衡混合物分别标记金属硫蛋白Cd-MT2及这些标记物在SephadexG-100柱上的淋洗行为和衰变趋向。实验结果表明,在生理pH条件下,Cd-MT2首先与212Bi结合,其标记率接近100%。 相似文献
3.
本文介绍了用NaI(Tl)-塑料反符合低本底γ谱仪测定大气中 ̄(212)Pb浓度的方法以及于1988.2-1989.1对北京地区329d空气中 ̄(212)Pb浓度的测定结果。结果表明,大气中 ̄(212)Pb浓度呈对数正态分布,算术均值和单次测量标准差分别为0.54和0.40Bq·m ̄(-3);几何均值和几何标准差分别为0.44Bq·m ̄(-3)和2.0。每年7、8月份雨季 ̄(212)Pb浓度最低(0.42Bq·m ̄(-3));冬季取暖季节最高(0.66Bq·m ̄(-3)); ̄(212)Pb浓度的昼夜变化亦很大,凌晨00-04时最高,午后12-18时最低,最高/最低为4.8。根据实际测量值估算了北京地区居民吸入所子体所致公众年有效剂量为210μSv,室内160μSv,室外为50μSv。 相似文献
4.
盛荣 《核化学与放射化学》1998,20(2):109-113
以酸性氧化铝为吸附剂,制备了一个118MBq的188W-188Re发生器,并对发生器性能进行了为期4个月的检测。结果表明,188Re的淋洗产额在80%—90%之间,188W的穿透率约为1.0×10-4%。由于采用了较大高径比的交换柱,使188Re的放射性比活度较高,能满足用于放射免疫治疗研究的抗肿瘤单克隆抗体标记的要求。 相似文献
5.
WANG Ning LI Zhu-xia WU Xi-zhen 《中国原子能科学研究院年报》2005,(1):72-72
In most attempts to produce superheavy elements(SHE), the complete fusion reactions have successfully been tried. Since the 70's the elements from Z=107 to 116 were synthesized in the "cold fusion" reactions with lead and bismuth targets and "hot fusion" reactions with actinite targets. However, 相似文献
6.
7.
SUN Hong-qing DING You-qian YANG Zhi-hong ZHANG Sheng-dong CUI An-zhi 《中国原子能科学研究院年报》2004,(1):105-106
DC-DC开关功率变换器在通信、军事设备、计算机、仪器仪表及工业自动化设备等电子工业和军工系统中有着极其广泛的应用。近年来,DC—DC开关功率变换器动力学性质的研究发现,该变换器中有着十分丰富的非线性动力学行为,例如DC—DC开关功率变换器经过一系列分岔如倍周期分岔、边界碰撞分岔等可达到混沌。由于DC-DC开关功率变换器运行中,电路拓扑结构随时间改变,使其成为一个典型的分段光滑非线性动力系统。 相似文献
8.
ZHAO Kai LI Zhu-xia WU Xi-zhen WANG Ning ZHANG Ying-xun TIAN Jun-long ZHANG Huan-qiao LIU Zu-hua 《中国原子能科学研究院年报》2005,(1):69-69
Based on the Improved Quantum Molecular Dynamics Model the fusion reactions of ^40,48Ca+^90,96Zr are studied by making a more rigorous treatment of the initial condition. The study shows us that: (1) the calculated fusion cross sections for all four reactions of ^40,48Ca+^90,96Zr are in good agreement with experiment data; 相似文献
9.
一、引言萃淋树脂在分析分离及湿法冶金中取得了良好的应用效果。用它来分离性质相近的元素有不少报道,有人以D_2EHPA为固定相,用萃取色层法分离~(90)Sr-~(90)Y。但是,用P_(207)萃淋树脂来分离~(90)Sr-~(90)Y,尚鲜见报道。本文对P_(507)萃淋树脂的基本性能进行了测试。在探讨~(90)Sr-~(90)Y在该萃淋树脂上吸附淋 相似文献
10.
11.
12.
13.
M.J. Martin 《Nuclear Data Sheets》1979,27(4):637-679
Detailed level schemes, decay schemes, and the experimental data on which they are based are presented for all nuclei with mass number A = 212. The experimental data are evaluated; inconsistencies and discrepancies are noted; and adopted values for level and gamma-ray energies, gamma intensities, as well as other nuclear properties are given. 相似文献
14.
P. P. Boldyrev A. I. Bortash V. A. Zagryadskii A. S. Zakharov V. I. Nikolaev M. A. Proshin D. Yu. Chuvilin A. V. Shatrov S. P. Vesnovskii 《Atomic Energy》2012,111(6):422-427
A scheme for producing the α-emitters 212Pb and 212Bi, to be used in a promising method of diagnostics and therapy in oncology – radioimmunotherapy, is proposed. The technology
is based on two generators operating in tandem: 228Th/212Pb and 212Pb/212Bi. The first one is based on separation from an initial solution containing thorium isotopes and gaseous 220Rn, which secures the purity of the desired products 212Pb and 212Bi. For a 228Th/212Pb model generator, the efficiency of 220Rn extraction from solution was ~60%. After conditioning, the 212Pb solution from the 228Th/212Pb generator was used to charge a column, which functioned as a 212Pb/212Bi generator, with a cation exchanger. 相似文献
15.
16.
《Journal of Nuclear Science and Technology》2013,50(3):155-162
Fractional electro-deposition of 212Pb and 208T1 from RdTh source using a capsule equipped with three electrodes was carried out under normal pressure. The experiment was conducted with variations brought to the applied voltage, the interval between the electrodes, time allowed for deposition and grid conditions. The active deposit thus obtained was examined by radiochemical and autoradiographical methods. Measurements of the active deposits on the electrodes showed that 212Pb had deposited on the grid net, and 208T1 on the target. The mechanism of the electro-deposition process under electric field with and without a grid is discussed on the basis of the decay pattern shown by each nuclide. 相似文献
17.
用中国原子能科学研究院HI-13串列加速器,高压倍加器和北京大学4.5MV静电加速器分别获得能量为10-12,14和18MeV的中子,了^176Hf(n,2n)和^185Re(n,2n)的反应堆面,并与现有的实验数据作了比较,初步搞清了分歧的主要原因和激发函数的走向。 相似文献
18.
19.
用穆斯堡尔效应和磁测量方法对非晶态薄带(Fe_(1-x)Y_x)_(84)B_(16)(0≤x≤0.21)进行了研究。实验结果证实在所研究的样品中存在短程有序相互作用和由于钇替代而产生的不均匀区域。 相似文献