CAJ | 학술논문

研究利用铱(Ir)作为信号元素制备示踪沙,在长江口北槽深水航道维护困难区段开展示踪沙的现场投放及回收试验.利用火试金法对回收的泥沙样品进行痕量铱金属的提炼,并将其富集在微小铅珠中;再将铅珠压成薄片,并作为原子反应堆照射靶样进行中子活化分析,检测铱的含量.实验结果表明,在位于北槽深水航道北侧的3#坑投放示踪沙,北槽试验区所有泥沙样品中均检测出铱含量,其中位于深水航道南侧滩地上泥样中铱含量最高.因此,北侧3#贮泥坑流失的泥沙存在着跨越航道进入南侧边滩的情况,这对北槽中段航道回淤的影响较大,为改善北槽深水航道困难段的维护条件需要改进该处的抛吹泥工艺或限制抛泥活动.
연구이용의(Ir)작위신호원소제비시종사,재장강구북조심수항도유호곤난구단개전시종사적현장투방급회수시험.이용화시금법대회수적니사양품진행흔량의금속적제련,병장기부집재미소연주중;재장연주압성박편,병작위원자반응퇴조사파양진행중자활화분석,검측의적함량.실험결과표명,재위우북조심수항도북측적3#갱투방시종사,북조시험구소유니사양품중균검측출의함량,기중위우심수항도남측탄지상니양중의함량최고.인차,북측3#저니갱류실적니사존재착과월항도진입남측변탄적정황,저대북조중단항도회어적영향교대,위개선북조심수항도곤난단적유호조건수요개진해처적포취니공예혹한제포니활동.
In the paper, Tracer sediment marked by the signal element of rare metal Iridium is used to study the back silting problem at the north passage deep channel of the Yangtze estuary. Fire assaying method is used to collect the signal element of Iridium in the sediment samples and enrichment of Iridium is made in the small lead ball. After the small lead ball is turned to the small slice, the element of Iridium can be activated to turn the radioactive Iridium-192 in the nuclear reactor, and the content of Iridium can be measured using γ-ray spectrumeter. The result of field experiment shows all sediment samples contain the signal element of rare metal Iridium after the tracer sediment is cast in the dredged material disposal site which is located at the north side of the deep channel. The Iridium content of sediment samples which are collected at the south side of the deep channel is the highest. The results mean the dredged disposal sediment cast in 3# site which is located at the north side of the deep channel can be transported to the south side of the deep channel. The sediment transport path means the dredged disposal sediment may affect the back silting of the deep channel. I n order to solve the problem of back silting, dredged disposal sediment in 3# site must be restricted.