CAJ | 학술논문

在查明场址地球化学特征的基础上,研究了238U、90Sr在场址包气带土壤中的吸附与迁移特征.设计了一系列非均匀介质实验模型,研究了在瞬时源和连续源条件下238U、90Sr在非均匀介质中的迁移特征.同位素迁移屏障研究在研究场址围岩对核素的吸附特征的基础上,筛选出合适的矿物添加剂以提高场址岩土对90Sr迁移的屏障能力.结果表明,238U和90Sr在场址土壤中迁移速度分别为0.365和0.385 mm/a.非均匀介质对同位素迁移影响首先是减弱了主流体的污染强度,同时延长了污染作用时间;添加剂人造沸石可作为90Sr迁移屏障材料.
재사명장지지구화학특정적기출상,연구료238U、90Sr재장지포기대토양중적흡부여천이특정.설계료일계렬비균균개질실험모형,연구료재순시원화련속원조건하238U、90Sr재비균균개질중적천이특정.동위소천이병장연구재연구장지위암대핵소적흡부특정적기출상,사선출합괄적광물첨가제이제고장지암토대90Sr천이적병장능력.결과표명,238U화90Sr재장지토양중천이속도분별위0.365화0.385 mm/a.비균균개질대동위소천이영향수선시감약료주류체적오염강도,동시연장료오염작용시간;첨가제인조비석가작위90Sr천이병장재료.
In this work, adsorption and migration of 238U and 90Sr in unsaturated soil at a VLLW (very low level waste) site was investigated, in an attempt to find geochemical features of the site. Migration of the isotopes in heterosphere was studied under instantaneous and sequential conditions of the sources. The migration barrier experiment was carried out in two steps on wall rock absorption of the isotopes and addictives to improve the barrier of the wall rock to 90Sr. The results show that the migration speed of 238U and 90Sr in the soil is 0.365 and 0.385 mm/a, respectively. The heterosphere effects on the isotope migration not only alleviated the mainstream contamination, but also prolonged the time of contaminated affection. And false zeolite should be used as barrier additive material for 90Sr migration.