高温超导红外测辐射热计

根据超导测辐射热计的理论，以YBCO为材料，制备的高温超导薄膜型红外测辐射热计，黑体响应度Rv＞104V／W，D*＞1010cmHz1／2W－1，NEP≈10－14WHz-1／2。测量和分析了器件的频率响应、噪声特性和其对1～15μm波段及118．8μm，337μm，570．5μm，699μm，1009．4μm等波长的光谱响应。测量结果表明，高温超导红外测辐射热计对整个红外波谱都有响应，但其性能在远红外波段衰减很厉害，因此，对器件的表面处理应是提高其长波性能的一个关键。     

~(99)Tc~m-NMIBI的电荷性质及其与~(99)Tc~m-MIBI的比较

采用区带电泳法和阳离子树脂交换法测定了新型潜在心肌灌注显像剂＾９９Ｔｃ＾ｍＮ－ＭＩＢＩ的电荷性质,且在相同条件下测定了＾９９Ｔｃ＾ｍ－ＭＩＢＩ的电荷性质,并将二者的电荷性质进行了比较。电泳实验结果表明,有７５．６３％＾９９Ｔｃ＾ｍ－ＭＩＢＩ移向负极;在阳离子树脂交换实验中,＾９９Ｔｃ＾ｍ－ＭＩＢＩ的ｌｇ Ｄ－ｐＨ直线斜率ｘ＝０．０４,而相应的＾９９Ｔｃ＾ｍ－ＭＩＢＩ的直线斜率ｘ＝０．９９。两种实验     

~(99)Tc~mN-CHDTC的制备,生物分布及与~(99)Tc~m-CHDTC的对比

以SnCl2 · 2H2 O为还原剂 ,丁二酰二酰肼 (SDH )为N3- 离子提供体 ,在室温下制备[99TcmN]2 +int 中间体 ,然后与二水·N 环己基 二硫代氨基甲酸钠 (CHDTC)发生配位体交换反应得到放化纯大于 90 %的99TcmN CHDTC配合物。小鼠体内的生物分布实验表明 ,99TcmN CHDTC有较高的脑摄取和较好的脑滞留。注射后 5,30 ,6 0min时 ,脑摄取量 (% /g)分别为 2 91,5 88,5 91,R(脑 /血 )比值分别为 0 14,1 4 6 ,2 10。99TcmN CHDTC在心肌中也有较高的摄取 ,但R(心 /肝 )比值低。采用甲脒亚磺酸 (FSA)作还原剂对配位体CHDTC进行99Tcm 直接标记 ,其在小鼠体内的生物分布结果表明 ,99Tcm CHDTC主要蓄积在肝脏 ,脑、心肌摄取很少。这表明放射性药物分子中引入 [99TcmN]2 +核会引起生物分布性质的明显改变     

Characteristics of the Origin of High Tc Copper Oxidized Cooper Pairs

The mechanism of the superconductivity of high Tc copper oxidized superconductors is a important and basic research subject. The characteristics of high Tc copper oxidized Cooper pairs was studied by the mechanism of high Tc superconductivity combined with the theory of quantum chemical bond and Sanderson＇s electronegativity principle. It was concluded that the high Tc copper oxidized Cooper pairs originated from the non-bonding electrons which undertook the elements of the superconductivity.     

Overall design of CYCIAE-14, a 14 MeV PET cyclotron

Based on a 10 MeV CRM cyclotron developed at China Institute of Atomic Energy (CIAE) with an achieved beam intensity of up to 430 μA, a 14 MeV high intensity compact cyclotron, CYCIAE-14, was designed and being built at CIAE. It is planned that the first machine would be in place with a span of 2 years. CYCIAE-14 is delicately designed to realize strong vertical focusing by adopting a 4-sector, variable hill-gap structure with an external ion source to achieve high intensity. A special design applied to the stripping extraction gives access to dual extraction with four beams. The adoption of sophisticated industrial technology will give the cyclotron advantages, e.g. low power consumption and high reliability. This paper is aimed to present the overall design of the machine, including the basic technical specifications, main magnet and coils, RF, ion source and axial injection, and stripping extraction, etc. It will also give an introduction to its construction schedule as well as the up-to-date progress.     

锝化学研究 Ⅺ.~(99)T~(cm)脑放射性药物异构体构效关系的研究

采用数理统计方法，对２０种主要９９Ｔｃｍ脑显像剂异构体脑吸收的立体效应进行了分析，得到相应的结构参数及ＱＳＡＲ方程，讨论了已有的脑放射性药物异构体具有不同生物分布的原因。     

六氟化铀中痕量~(99)Tc的放化测定

一、前言本工作系六氟化铀水解溶液中痕量~(99)Tc的测定。定量测定~(99)Tc有各种方法,但通常多采用简便的β放射性测量法和分光光度法。~(99)Tc是一个纯β放射体,其比活度较高(3.78×10~(10)Bq/min·g)。在UF_6产品中,除了大量铀、氟外,其它杂质和干     

加银Bi系高温超导带材的抗弯性能测试

对加银和不加银Ｂｉ－２２２３／Ａｇ带材的弯曲应变特性进行了研究，并对两种带材进行了ＸＲＤ和ＳＥＭ分析。试验证明，加银粉带材的机械性能高于不加银带材，制造线圈后，Ｊｃ也较高。     

锝化学研究ⅩⅢ.~(99)Tc~m-配合物的溶剂化自由能与其脑吸收值的关系

利用G98W程序，采用Hartree-Fock方法和赝势基组LANL2DZ，首先在真空状态下对Tc－配合物进行构型优化，然后根据极化连续体模型（PCM）计算了Tc－配合物在水溶液和甲醇溶液中的溶剂化自由能。结果发现，其中CPCM模型和IEFPCM模型计算的^99Tc^m－配合物在溶液中的溶剂化自由能不仅可以更灵敏地反映其脂溶性的大小，而且是影响脑吸收值的重要因素。     

YBCO超导薄膜侧馈H天线实验研究

利用ＹＢＣＯ／ＹＳＺ超导薄膜制做了侧馈的Ｈ天线，实验表明，与相同的银膜侧馈Ｈ天线相比，相对效率在ｘ极化方向上提高了９．３ｄＢ，在ｙ极化方向上提高了１３．６ｄＢ。