医用同位素锝-99m(99mTc)被广泛应用于核医学领域,其主要来源于母体核素钼-99(99Mo)的衰变。但是目前国内99Mo基本依赖进口,通常出现99Mo不能稳定供应的现象。为解决这个重大问题,实现国内99Mo自主化生产具有重要意义。本文基于中国科...医用同位素锝-99m(99mTc)被广泛应用于核医学领域,其主要来源于母体核素钼-99(99Mo)的衰变。但是目前国内99Mo基本依赖进口,通常出现99Mo不能稳定供应的现象。为解决这个重大问题,实现国内99Mo自主化生产具有重要意义。本文基于中国科学院近代物理研究所强流超导直线加速器(China ADS Front End,CAFE)提供的质子束流辐照天然铀靶件,主要开展铀裂变产物中医用同位素99Mo的高效化学分离、纯化及99Mo/99mTc发生器的制备。研究表明:通过α-安息香肟(α-BO)沉淀分离99Mo后,杂质核素去除率大于90%,99Mo的回收率大于90%。通过对99Mo沉淀进行纯化后,大部分杂质核素被去除。提取的99Mo被装配为99Mo/99mTc发生器,发生器淋洗曲线表明:99mTc产品收集在8 mL生理盐水内最为适宜,同时,99mTc回收率大于80%。电感耦合等离子体发射光谱仪(ICP-OES)测量结果表明,99mTc产品中Al、Mo以及U含量极低;同时,99mTc产品的γ谱图中未出现99Mo和其他杂质核素的γ能量峰。以上研究结果可为国内基于加速器辐照天然铀生产99Mo提供技术参考。展开更多
All isotopes of superheavy elements(z>103)are short-lived and available only at the level of"one-atom-at-a-time"^([1]).Experimental research of their chemical properties should be therefore preferentially...All isotopes of superheavy elements(z>103)are short-lived and available only at the level of"one-atom-at-a-time"^([1]).Experimental research of their chemical properties should be therefore preferentially performed with their lighter homologous elements.展开更多
The removal of radioactive actinide from rare earth products is an important task and key technology in the production of rare earth products.That is because element Actinium(Ac)and Lanthanum(La)belong to the same cla...The removal of radioactive actinide from rare earth products is an important task and key technology in the production of rare earth products.That is because element Actinium(Ac)and Lanthanum(La)belong to the same clan in the periodic table.展开更多
With the development of nuclear power,more and more spent nuclear fuel will be produced and accumulated.Reprocessing of these spent nuclear fuel became the key issues for the environmentally friendly and sustainable d...With the development of nuclear power,more and more spent nuclear fuel will be produced and accumulated.Reprocessing of these spent nuclear fuel became the key issues for the environmentally friendly and sustainable development of nuclear energy.展开更多
High precise determination of stable isotope ratios usually executes by TIMS(Thermal Ionization Mass Spectrom-eter)or MC-ICP-MS(Multi Collectors Inductively Coupled Plasma Mass Spectrometer)[1].
^(99)mTc is the most commonly used diagnostic medical radioisotope because of its short half-life(T1/2=6.01 h)and low β-energy(140.5 keV)[1].Generally,^(99)mTc is obtained from^(99)Mo decays by β-emission.
Rare earth(RE)elements have a large neutron cross section so that it should be removed before the reuse of spent fuel for improving the utilization of U resources.The volatilization technology[1]can release most of vo...Rare earth(RE)elements have a large neutron cross section so that it should be removed before the reuse of spent fuel for improving the utilization of U resources.The volatilization technology[1]can release most of volatile and semi-volatile fission elements,but not any significant amounts of RE.Based on the previous investigation on high temperature crystallization and the formation of rich and poor RE phase[2,3],the removing RE-rich phase from simulated fuel is studied in this work.As literatures report,the conventional separation techniques include sieving,air classification,sedimentation,and so on.The cyclonic sieving method is the promising appoach at present with the advantages of small equipment,simple operation and high efficiency.展开更多
Vanadium was a rarely trace element in saline lake water[1].It indicated varying valences as uranium,so it disrupted the behaviors of uranium in the research of uranium[2].The determination of vanadium in saline lake ...Vanadium was a rarely trace element in saline lake water[1].It indicated varying valences as uranium,so it disrupted the behaviors of uranium in the research of uranium[2].The determination of vanadium in saline lake water by Inductively Coupled Plasma Mass Spectrometry(ICP-MS)was developed[3;4].The salinity of saline lake water was high,influenced the determination of vanadium.The water samples were diluted 500 times directly by deionized water,to fulfill the requirement of ICP-MS[5].展开更多
Radioisotopes are widely used for diagnostics,therapy of various diseases,and research in nuclear medicine.But the all medical isotopes used in the hospital of China were bought from overseas.Hence,we need develope th...Radioisotopes are widely used for diagnostics,therapy of various diseases,and research in nuclear medicine.But the all medical isotopes used in the hospital of China were bought from overseas.Hence,we need develope the corresponding technologies about the production and separation of the radioisotopes.展开更多
文摘医用同位素锝-99m(99mTc)被广泛应用于核医学领域,其主要来源于母体核素钼-99(99Mo)的衰变。但是目前国内99Mo基本依赖进口,通常出现99Mo不能稳定供应的现象。为解决这个重大问题,实现国内99Mo自主化生产具有重要意义。本文基于中国科学院近代物理研究所强流超导直线加速器(China ADS Front End,CAFE)提供的质子束流辐照天然铀靶件,主要开展铀裂变产物中医用同位素99Mo的高效化学分离、纯化及99Mo/99mTc发生器的制备。研究表明:通过α-安息香肟(α-BO)沉淀分离99Mo后,杂质核素去除率大于90%,99Mo的回收率大于90%。通过对99Mo沉淀进行纯化后,大部分杂质核素被去除。提取的99Mo被装配为99Mo/99mTc发生器,发生器淋洗曲线表明:99mTc产品收集在8 mL生理盐水内最为适宜,同时,99mTc回收率大于80%。电感耦合等离子体发射光谱仪(ICP-OES)测量结果表明,99mTc产品中Al、Mo以及U含量极低;同时,99mTc产品的γ谱图中未出现99Mo和其他杂质核素的γ能量峰。以上研究结果可为国内基于加速器辐照天然铀生产99Mo提供技术参考。
文摘All isotopes of superheavy elements(z>103)are short-lived and available only at the level of"one-atom-at-a-time"^([1]).Experimental research of their chemical properties should be therefore preferentially performed with their lighter homologous elements.
文摘The removal of radioactive actinide from rare earth products is an important task and key technology in the production of rare earth products.That is because element Actinium(Ac)and Lanthanum(La)belong to the same clan in the periodic table.
文摘With the development of nuclear power,more and more spent nuclear fuel will be produced and accumulated.Reprocessing of these spent nuclear fuel became the key issues for the environmentally friendly and sustainable development of nuclear energy.
文摘High precise determination of stable isotope ratios usually executes by TIMS(Thermal Ionization Mass Spectrom-eter)or MC-ICP-MS(Multi Collectors Inductively Coupled Plasma Mass Spectrometer)[1].
文摘^(99)mTc is the most commonly used diagnostic medical radioisotope because of its short half-life(T1/2=6.01 h)and low β-energy(140.5 keV)[1].Generally,^(99)mTc is obtained from^(99)Mo decays by β-emission.
文摘Rare earth(RE)elements have a large neutron cross section so that it should be removed before the reuse of spent fuel for improving the utilization of U resources.The volatilization technology[1]can release most of volatile and semi-volatile fission elements,but not any significant amounts of RE.Based on the previous investigation on high temperature crystallization and the formation of rich and poor RE phase[2,3],the removing RE-rich phase from simulated fuel is studied in this work.As literatures report,the conventional separation techniques include sieving,air classification,sedimentation,and so on.The cyclonic sieving method is the promising appoach at present with the advantages of small equipment,simple operation and high efficiency.
文摘Vanadium was a rarely trace element in saline lake water[1].It indicated varying valences as uranium,so it disrupted the behaviors of uranium in the research of uranium[2].The determination of vanadium in saline lake water by Inductively Coupled Plasma Mass Spectrometry(ICP-MS)was developed[3;4].The salinity of saline lake water was high,influenced the determination of vanadium.The water samples were diluted 500 times directly by deionized water,to fulfill the requirement of ICP-MS[5].
文摘Radioisotopes are widely used for diagnostics,therapy of various diseases,and research in nuclear medicine.But the all medical isotopes used in the hospital of China were bought from overseas.Hence,we need develope the corresponding technologies about the production and separation of the radioisotopes.
