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本文研究了沥青及沥青固化产品的辐照稳定性。实验主要采用国产60~#沥青固化含50wt%NaNO_3的模拟中水平放射性废液,所得的固化产品用~(60)Co 源进行外辐照。实验结果表明,当总吸收剂量为1×10~8拉德时,物化性能改变不大,但有气孔,体积膨胀及辐解气体产生,Na~+的浸出率为～10~(-4)克/厘米~2·天,辐解 H_2量为0.305升/公斤固化物。当总吸收剂量为1×10~9拉德时,产品的物化性能有很大变化,Na~+的浸出率为5×10~(-3)克/厘米~2·天,比未辐照时约增加50倍,辐解H_2量为3.69升/公斤固化物。根据计算,总吸收剂量为1×10~8拉德时相当于1居里/升的沥青固化产品贮存1000年的总吸收剂量。因此,我们认为用沥青固化处理1居里/升的老裂片废液,从辐照的角度来看是可行的。
This article studies the radiation stability of asphalt and asphalt cured products. The experiment mainly used domestic 60 ~ # asphaltic curing mid-level radioactive waste liquid containing 50wt% NaNO_3. The obtained cured product was irradiated by ~ (60) Co source. The experimental results show that when the total absorbed dose is 1 × 10 ~ 8 rad, the physicochemical properties change little, but the pores, the volume expansion and the radiolysis gas are produced. The leaching rate of Na ~ + is ~ 10 ~ (-4) G / cm ~ 2 · day, radiation H_2 amount of 0.305 liters / kg cured material. When the total absorbed dose was 1 × 10 ~ 9 rad, the physicochemical properties of the product varied greatly. The leaching rate of Na ~ + was 5 × 10 ~ (-3) g / cm ~ 2 · day, When about an increase of 50 times the amount of radiation H_2 3.69 l / kg cured. Based on the calculated total absorbed dose of 1 x 10 ~ 8 Ladd equivalent to 1 Curie / liter of asphalt cured product stored 1000 total absorbed dose. Therefore, we believe that it is feasible from the radiation point of view to treat solidified waste streams of old slurries at a rate of 1 curie / liter with asphalt.