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Alpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses
npj Materials Degradation ( IF 5.1 ) Pub Date : 2021-07-07 , DOI: 10.1038/s41529-021-00183-4
Magaly Tribet 1 , Caroline Marques 1 , Sarah Mougnaud 1 , Véronique Broudic 1 , Christophe Jegou 1 , Sylvain Peuget 1
Affiliation  

In the prospect of deep geological disposal, the long-term behavior of high-level nuclear glasses has to be investigated regarding alpha radiation induced by long-life minor actinides. The present study focuses on the effects of alpha radiation on the long-term chemical reactivity of R7T7-type glasses, by separately considering the alpha dose rate and the alpha decay dose. Old SON68 glasses doped with 238/239PuO2 or 244CmO2 were studied to simulate high alpha dose rates corresponding to an early water ingress and a high level of alpha decay doses corresponding to long-term disposal conditions. A part of the 238/239Pu-doped glass block was annealed to fully recover the irradiation-induced damage accumulated since the glass was fabricated and to dissociate the effect of the alpha dose rate from that of the alpha decay dose. The glasses were then leached under static conditions at 90 °C for several years. The results showed that the residual alteration rate is not affected by the alpha dose rate over a wide range of dose rate values expected under disposal conditions: this glass remained relatively insensitive to the alpha radiolysis phenomena at the glass–water interface. However, over the duration of the experiments, the residual alteration rate of the damaged 238/239Pu-doped glass was enhanced compared to that of the annealed glass. This result is in agreement with those obtained on the 244Cm-doped glass and with reported values in the literature on simplified externally irradiated glasses, indicating that the ballistic effects of the recoil nuclei are responsible for this increase in the residual alteration rate.



中文翻译:

α剂量率和衰变剂量对高放核玻璃长期变化的影响

在深部地质处置的前景中,必须就长寿命次锕系元素引起的α辐射研究高能级核玻璃的长期行为。本研究通过分别考虑 α 剂量率和 α 衰变剂量,重点研究 α 辐射对 R7T7 型玻璃长期化学反应性的影响。研究了掺杂238/239 PuO 2244 CmO 2 的旧 SON68 玻璃,以模拟与早期进水相对应的高 α 剂量率和与长期处置条件相对应的高水平 α 衰变剂量。238/239的一部分对掺杂 Pu 的玻​​璃块进行退火,以完全恢复自玻璃制造以来累积的辐射诱导损伤,并将 α 剂量率的影响与 α 衰变剂量的影响分离。然后将玻璃在 90 °C 的静态条件下浸析数年。结果表明,在处置条件下预期的广泛剂量率值范围内,残余改变率不受 α 剂量率的影响:这种玻璃对玻璃-水界面处的 α 辐射分解现象保持相对不敏感。然而,在实验过程中,与退火玻璃相比,受损的238/239 Pu 掺杂玻璃的残余变化率有所提高。该结果与在244Cm 掺杂的玻璃和文献中关于简化的外照射玻璃的报道值,表明反冲核的弹道效应是导致残留改变率增加的原因。

更新日期:2021-07-07
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