CAJ | 학술논문

针对内华达核试验场CHESHIRE地下核试验状况和近场水文地质参数，建立了熔岩玻璃体239 Pu的溶解释放和迁移模型。估算了熔岩玻璃体释放产生239 Pu的速率，将释放出的239 Pu分为溶解态和胶体态，以软件FEFLOW作为建模工具，数值模拟了10万年内溶解态239 Pu和胶体态239 Pu在地下水中的污染羽分布。模拟结果表明，溶解态239 Pu不能发生远距离迁移，影响迁移的关键参数是分配系数，当分配系数大于10 mL/g后，可忽略溶解态239 Pu的远距离迁移；胶体态239 Pu在爆心下游形成较固定的污染晕，距爆心1.3 km处的胶体态239 Pu的模拟活度浓度长期处于10-2 Bq/L ；影响胶体态239 Pu迁移的主要因素包括熔岩玻璃体的溶解速度、熔岩玻璃体释放239 Pu形成胶体态239 Pu的比例、岩层渗透系数。由模拟结果可见，只有当239 Pu形成胶体粒子后才可能发生远距离迁移。
침대내화체핵시험장CHESHIRE지하핵시험상황화근장수문지질삼수，건립료용암파리체239 Pu적용해석방화천이모형。고산료용암파리체석방산생239 Pu적속솔，장석방출적239 Pu분위용해태화효체태，이연건FEFLOW작위건모공구，수치모의료10만년내용해태239 Pu화효체태239 Pu재지하수중적오염우분포。모의결과표명，용해태239 Pu불능발생원거리천이，영향천이적관건삼수시분배계수，당분배계수대우10 mL/g후，가홀략용해태239 Pu적원거리천이；효체태239 Pu재폭심하유형성교고정적오염훈，거폭심1.3 km처적효체태239 Pu적모의활도농도장기처우10-2 Bq/L ；영향효체태239 Pu천이적주요인소포괄용암파리체적용해속도、용암파리체석방239 Pu형성효체태239 Pu적비례、암층삼투계수。유모의결과가견，지유당239 Pu형성효체입자후재가능발생원거리천이。
According to the circumstances of an underground nuclear test CHESHIRE at the Nevada Test Site ,a model was developed to simulate the dissolution and migration of 239 Pu from melt glass in groundwater .The release rate of 239 Pu was calculated and the released 239 Pu was divided into dissolved fraction and colloid fraction . The pollution plumes for dissolved 239 Pu and colloid 239 Pu were simulated in 100 000 years by software FEFLOW .The results show that the dissolved 239 Pu can’t migration far away from the melt glass and sorption coefficient is the key parameter .If sorption coefficient is more than 10 mL/g ,the long distance migration of dissolved 239 Pu can be ignored .The colloid 239 Pu plume will be long-standing in the downstream of the melt glass .The 239 Pu con-centration at 1.3 km away from the melt glass would be 10-2 Bq/L for a long time .The parameters effecting colloid 239 Pu migration are the melt glass release rate ,the colloid fraction ratio and aquifer conductivity .It can be concluded that only colloid 239 Pu can migrate far away from the melt glass .