Radiation stability of a cementation matrix for spent radioactive resin

LI Junfeng; QIU Yu; WANG Jianlong

doi:10.16511/j.cnki.qhdxxb.2017.25.013

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Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (4) : 410-414. DOI: 10.16511/j.cnki.qhdxxb.2017.25.013

NUCLEAR ENERGY AND NEW ENERGY

Radiation stability of a cementation matrix for spent radioactive resin

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Abstract

The radiation stability of the cementation matrix for spent radioactive resin when exposed to high radioactive fluxes was investigated using a sulfoaluminate cementation matrix for radioactive waste. The variation of the compressive strength after irradiation, the strength losses after freezing and the leach rate were compared for various γ-ray radiation doses. The microstructures of the hydration products in the irradiated cementation matrix were observed using an SEM. The results show that the radiation reduces the compressive strength of the cementation matrix with the losses increasing with the dose. The strength losses after freezing were also increased by the radiation. The adsorption of leaching ions was reduced. The aluminium micelles in the microstructure were reduced. The radiation may cause the decomposition of the aluminium micelles, which may led to the increased radionuclide leach rate. The results also showed that the matrix stability was not affected by the radiation when the total absorbed dose was below 10⁵Gy.

Key words

radioactive waste resin / cementation / radiation stability / compressive strength / leaching rate

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LI Junfeng, QIU Yu, WANG Jianlong. Radiation stability of a cementation matrix for spent radioactive resin[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(4): 410-414 https://doi.org/10.16511/j.cnki.qhdxxb.2017.25.013

References

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