Radiation Damage Effects in Candidate Titanates for Pu Disposition: Zirconolite
Radiation Damage Effects in Candidate Titanates for Pu Disposition: Zirconolite
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DOI：
10.1016/j.jnucmat.2007.01.278
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发表时间：
2008-01
影响因子：
3.1
通讯作者：
D. Strachan;R. Scheele;E. Buck;A. E. Kozelisky;R. Sell;R. Elovich;W. Buchmiller
中科院分区：
文献类型：
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作者：
D. Strachan;R. Scheele;E. Buck;A. E. Kozelisky;R. Sell;R. Elovich;W. Buchmiller
本文讨论了238pu α衰变对一种名义上纯锆石和另外两种含锆石陶瓷的密度和晶体结构的辐射损伤研究结果。宏观和微观膨胀与温度无关，而He气体比重法测定的密度与温度有关。大约需要2.6×1018α/g才能使样品的x射线无定形-更多以饱和膨胀。与焦绿石陶瓷不同，我们没有观察到任何与储存温度和生长损伤相关的相变。当pH值为2时，锆石的正向溶解速率为1.7(4)×10−3g/(m2d)，与pH值的关系很小，与辐射损伤量无关。即使在辐射引起的膨胀饱和后，样品在物理上保持完整，没有微开裂的证据。因此，这种材料在物理上仍然是处理剩余武器级钚的可行材料。
Results from studies of radiation-induced damage from the alpha decay of238Pu on the density and crystal structure of a nominally phase-pure zirconolite and two other zirconolite-bearing ceramics are discussed. Macro and micro swelling were found to be temperature independent, whereas the density determined with He gas pycnometry was temperature dependent. Approximately 2.6×1018α/g were needed to render the specimens X-ray amorphous– more to saturate the swelling. Unlike pyrochlore-based ceramics, we did not observe any phase changes associated with storage temperature and damage ingrowth. The forward dissolution rate at a pH value of 2 for material containing essentially all zirconolite is 1.7(4)×10−3g/(m2d) with very little pH dependence and no dependence on the amount of radiation-induced damage. Even after the radiation-induced swelling saturated, the specimens remained physically intact with no evidence for microcracking. Thus, the material remains physically a viable material for the disposition of surplus weapons-grade Pu.