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Study of radiogenic helium diffusion in the beta-thorium phosphate diphosphate ceramic

机译:β-磷酸phosphate二磷酸盐陶瓷中放射性氦扩散的研究

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beta-Thorium phosphate diphosphate polycrystalline ceramic is considered as a promising candidate for the immobilization of actinides in the field of along-term storage. In order to study the behavior of the ceramic in relation with the evacuation of helium produced by actinides and daughters disintegrations, the release of radiogenic helium from a sintered pellet aged over an about six year period was studied by thermal desorption and high resolution mass spectrometry. The apparent diffusion coefficients are determined for different annealing sequences and are approximately the same for zircon and britholite at low temperature and uranium dioxide ceramic at high temperature. The apparent diffusion coefficients are found to be (7 +/- 3) x 10(-22) m(2) s(-1) and (1.5 +/- 0.5) x 10(-20) m(2) s(-1) at 20 degrees C and 120 C, respectively. The activation energy for the apparent diffusion process encompassing both volume and inter-granular diffusion is estimated at 45 +/- 15 kJ mol(-1) in the studied temperature range (20-1020 degrees C). (c) 2007 Elsevier B.V. All rights reserved.
机译:β-hor磷酸二di磷酸酯多晶陶瓷被认为是长期储存领域中for系元素固定化的有前途的候选者。为了研究陶瓷的行为与and系元素分解和子体崩解产生的氦气的排空有关,通过热脱附和高分辨率质谱研究了老化大约六年的烧结球团中放射性氦的释放。视在扩散系数是针对不同的退火顺序确定的,对于低温下的锆石和水钠钙石以及高温下的二氧化铀陶瓷,其表观扩散系数大致相同。发现表观扩散系数为(7 +/- 3)x 10(-22)m(2)s(-1)和(1.5 +/- 0.5)x 10(-20)m(2)s( -1)分别在20摄氏度和120摄氏度。在研究温度范围(20-1020摄氏度)下,表观扩散过程(包括体积和晶间扩散)的活化能估计为45 +/- 15 kJ mol(-1)。 (c)2007 Elsevier B.V.保留所有权利。

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