三种铀靶中裂变气体产物氪、氙的释放
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摘要
选用溶液蒸干靶、粉状靶和块状靶等三种铀靶作为研究对象,初步研究了三种靶中气体裂变产物氪、氙的释放率。在西安脉冲堆辐照三种铀靶后,分别在常压循环和吸附真空两种释放模式下释放裂变气体产物氪、氙。采用间接法测定各气体产物的释放率。由固体裂变产物得到的总裂变数计算各气体裂变产物的总核数,由释放的气体裂变产物实测释放的产物总核数,以上两值之比表征释放率。结果表明:气体裂变产物释放率在三种铀靶中差异较大,在块状靶中最低,说明氪、氙的释放率与靶件的化学形态密切相关,氪、氙产物独立产额的大小也是决定释放率的重要因素。
Three kinds of uranium targets,solution-dried target,powder target and block target,were chosen to preliminarily study the release ratios of krypton and xenon fission products.After irradiated in Xi'an pulsed experiment reactor,the krypton and xenon products were released in normal-pressure-circular mode and adsorption-vacuum mode.An indirect approach was used to determine the ultimate release ratios of them.The solid product was used to determine the total fission number which was used to calculate the atom number of the krypton or xenon products.When the release atom number was determined by measuring the released gas product,the release ratio was expressed as the ratio of above two values.The results show that there is large difference of the release ratios in three kinds of targets and the lowest release ratio in block targets.So the release ratio is tightly correlative with the chemical form of target.At the same time,the independent yield of the gas product is also an important factor to the release ratio.
Three kinds of uranium targets,solution-dried target,powder target and block target,were chosen to preliminarily study the release ratios of krypton and xenon fission products.After irradiated in Xi'an pulsed experiment reactor,the krypton and xenon products were released in normal-pressure-circular mode and adsorption-vacuum mode.An indirect approach was used to determine the ultimate release ratios of them.The solid product was used to determine the total fission number which was used to calculate the atom number of the krypton or xenon products.When the release atom number was determined by measuring the released gas product,the release ratio was expressed as the ratio of above two values.The results show that there is large difference of the release ratios in three kinds of targets and the lowest release ratio in block targets.So the release ratio is tightly correlative with the chemical form of target.At the same time,the independent yield of the gas product is also an important factor to the release ratio.
引文
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[2]Colle J-Y,Maugeri E A,Thiriet C,et al.A mass spectrometry method for quantitative and kinetic analysis of gas release from materials and its application to helium desorption from irradiated fuel[J].J Nucl Sci Technol,2014,51(5):700-711.
[3]Lee C B,Yang Y S,Kim D H,et al.A new mechanistic and engineering fission gas release model for a uranium dioxide fuel[J].J Nucl Sci Technol,2008,45(1):60-71.
[4]Burkes D E,Casella A J,Casella A M.Measurement of fission gas release from irradiated UeMo dispersion fuel samples[J].J Nucl Mater,2016,478:365-374.
[5]刘杰,倪建忠,师全林,等.利用MCNP模拟气体裂变产物混合源的γ剂量率[J].核化学与放射化学,2014,36(增刊):72-77.