在线气相热色谱分离装置的研制

摘要: 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。

Abstract: DEVELOPEMENT OF ON-LINE GAS-THERMOCHROMATOGAPHIC SEPARATION EQUIPMENTZNAO ZHIZHENG;FAN WO;YANG WEIFAN;MO WANTONG; LI ZONGWEI ;QIN ZHI ;YANG YONGFENG;ZHAO LILI（Institute of Modern Physics，Academia Sinica，Lanzhou，730000）ABSTRACT 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 measured by Si（Au）detectors．In the on-line experimentelement Po has been separated from the residual nuclei of reaction ~(12)C（47MeV／u）＋~(209)Bi．α-spec-tra of ~(197)Po~m（T_(1／2)＝26s），~(198)Po（T_(1／2)＝1．76min）and ~(199)Po（T_(1／2_)＝4．2min）are measured．Thisequipment will be used to study the decay of heavy charged particles with short life-time. Key words Gas thermo-chromatography Rapid chemical separation On-line separa-tion equipment