~(18)O离子辐照过的天然铀中镤的分离和镤同位素新γ射线的观察

用液－液萃取法对１８Ｏ离子辐照过的天然铀中的镤进行了分离。通过γ射线谱测量，发现了可能属于２３６Ｐａ或２３７Ｐａ衰变的３４条新γ射线Pa was separated by extraction from the natural U irradia ted with 18 O ions. 34 new γ rays from the decay of 236 Pa or 237 Pa are found by γ ray measurement.国家自然科学基金,中国科学院资

从14MeV中子辐照过的锇靶中分离钨

用14MeV中子轰击天然锇靶,取道~(192)Os(n,α)反应生成~(189)W。利用改进的锇蒸馏装置蒸馏OsO_4,完成锇与反应产物的分离;通过四苯砷铼沉淀除去铼。使用HPGe探测器测量了分离的钨样品的γ射线谱,该γ射线谱显示钨样品中杂质元素的去污是令人满意的

新重丰中子同位素~（239）Pa的合成

本文简述了新重丰中子同位素２３９Ｐａ的首次合成和鉴别，并测定其半衰期为１０６±３０ｍｉｎ

新核素~(239)Pa的分离和鉴别

用５０ＭｅＶ／ｕ１８Ｏ离子照射厚天然铀靶，用ＨＰＧｅ探测器测量化学分离后的Ｐａ样品源，观察到了２３９Ｐａ的β－衰变子体２３９Ｕ的７４．６６ｋｅＶγ射线的生长和衰变，首次鉴定了新丰中子核素２３９Ｐａ，并确定了２３９Ｐａ的半衰期为（１０６±３０）ｍｉｎ。nat U targets are irradiated with 50 MeV/u 18 O ions.The Pa sample sources separated chemically are measured using a HPGe detector.A new neutron rich isotope, 239 Pa,has been identified for the first time by observation of the growth and decay of 239 U daughter.The half life of 239 Pa has been determined to be (106±30)min

新重丰中子核素（239）~Pa的观测

以５０ＭｅＶ／ｕ丰中子炮弹１８Ｏ轰击天然铀靶，通过奇异的多核于转移反应产生了２３９Ｐａ，用放射化学分离方法从复杂的反应产物中分离出Ｐａ活性，借助于２３９Ｐａ及其子体２３９Ｕ衰变的观察，鉴别了新重丰中子核素２３９Ｐａ，并测定其半衰期为１０６±３０ｍｉｎ．同时，还发现了能量为５２２．０、５６２．０、６３８．５、６８１．０ｋｅＶ的２３９Ｐａ的四条衰变γ射线

液-液萃取法从钨中分离钽

用放射化学方法和γ谱测量技术检验了在ＨＮＯ３－ＨＦ体系中用甲基异丁基酮萃取钽的快速化学分离流程。实验结果表明，该流程在ＨＮＯ３－ＨＦ体系中能快速、有效地从１４ＭｅＶ中子轰击天然钨靶样中分离钽，对Ｗ的去污系数在１０４以上。将上述化学流程用于中能１８Ｏ离子轰击过的钨靶时，从γ谱图发现，除少数元素未被分离外，核反应产生的大部分元素已被分离A rapid radiochemical separation procedure is performed using radiochemical separation method and γ spectrum measurement technique.In the procedure,tantalum produced by 14 MeV neutrons bombardment of natural tungsten is extracted by isobutyl methyl ketone from the HF HNO 3 solution.The experimental result shows that this separation procedure is rapid and efficient for separating tantalum from the mixed solution of HF HNO 3 by isobutyl methyl ketone and the decontamination factors are more than 10 4.At...中国科学院八五重大课题资

~(189)W衰变纲图

用14.8 MeV中子同天然锇反应, 取道192O(n, α) 反应产生189W。通过放射化学分离流程, 从反应产物中分出W。用高纯Ge探测器完成放射性W样品γ射线单谱的测量。在189Re激发能级文献值的基础上并依据衰变和能级的关系以及189W衰变的γ射线能量和相对强度的实验数据, 给出了建议的189W衰变纲图

用1-苯基-3-甲基-4-苯甲酰基-5-吡唑啉酮从硝酸中萃取痕量钍

用1-苯基-3-甲基-4-苯甲酰基-5-吡唑啉酮(PMBP)为萃取剂,~(234)Th作示踪剂,完成了在硝酸介质中痕量钍溶剂萃取行为的研究。在~(234)Th萃取效率与酸度、萃取剂浓度、平衡时间等依赖关系的条件实验的基础上,获得了萃取钍的最佳条件。使用改进的PMBP萃取钍的流程,从~(18)O离子辐照过的铀靶中分离钍,钍样品的γ射线单谱显示绝大部分反应产物和大量铀的去除是满意的

从辐照过的钍中分离镤的研究

研究了以１－苯基－３－甲基－４－苯甲酰基吡唑啉酮－５（ＰＭＢＰ）和三异辛胺（ＴＩＯＡ）为萃取剂，盐酸－氢氟酸溶液为反萃剂，从中子辐照过的钍中分离纯化镤的一个快速、有效的流程。对流程的一些主要步骤中的分离条件作了研究。以钍的裂变产物为多重示踪剂检验了该流程，得到了主要杂质元素的去污因子，给出了镤的回收率。A rapid and efficient procedure for separation of trace protactinium from thorium irradiated by 14 MeV neutrons is described by using 1 phenyl 3 methyl 4 benzoylpyrazolone 5(PMBP) and triisooctyl amine (TIOA) as extractants and hydrochloric hydrofluoric acid solution as back extractant.The separating conditions in some main steps of this procedure has been studied.The decontamination factors for principal impurity elements and the recovery efficiency for 233 Pa has been obtained.The procedu..

在线气相热色谱分离装置的研制

建成了一套在线气相热色谱分离装置。利用该装置，完成了气相热色谱管同气体喷射传输系统的耦合工作。带有吸附了反应余核的添加剂的气体通过毛细管被送到气相热色谱管，在这个加热石英管中，原子被解吸并且沿具有设计温度的石英管传输，只有不凝结的元素被传出管外并沉积在水冷轮上，以一组Ｓｉ（Ａｕ）探测器测出α谱。实验中，从４７ＭｅＶ／ｕ￣（１２）Ｃ＋￣（２０９）Ｂｉ反应余核中分离出了Ｐｏ元素，测到了￣（１９７）ｐｏ￣ｍ（Ｔ＿（１／２）＝２６ｓ）、￣（１９８）ｐｏ（Ｔ＿（１／２）＝１．７６ｍｉｎ）和￣（１９９）ｐｏ￣ｍ（Ｔ＿（１／２）＝４．２ｍｉｎ）的α谱。An on-line gas-thermochromatographic separation equipment is constructed.In this equip-ment the gas-chromatographic tube is coupled with a gas-jet system and a target chamber.Thegas with residual nuclei of heavy ion nuclear reaction is sent to the gas-chromatographic tube a-long a capillary.Atom is desorbed in a heated quart tube and transported along the tube which iskept at the designated temperature,Non-condensing elements are sent out of the tube and depositon a water-cooled wheel.α-spectra are measure