【摘要】 后处理设施退役过程中会产生浓度较高放射性气溶胶,需要进行处理。研究选择碳酸钙粉为介质发生模拟气溶胶,选定一种固定剂,运用超声雾化技术对模拟气溶胶进行了捕集与固定试验,结果表明:模拟气溶胶粒子数浓度随着雾化捕集过程逐渐降低,粒径较大的粒子首先被雾化捕集而沉降;固定剂通入量对雾化捕集和固定气溶胶的效果影响显著。对一台241Am污染的手套箱内气溶胶进行雾化捕集和固定研究表明:初始污染水平为183 Bq/m3的气溶胶经雾化捕集后可降至1.51 Bq/m3。雾化固定7 d时,气溶胶浓度无明显变化;固定14 d并启动排风扰动后,再悬浮率为6.5%,说明该固定剂对放射性气溶胶及松散污染物的捕集固定效果明显。更多还原

【Abstract】 The radioactive aerosol generated in decommissioning the reprocessing facilities should be treated for its high concentration. CaCO3powder was selected as the source to produce simulative aerosolin this study. The ultrasonic atomizing technology was applied to capture and encapsulate the aerosol. The experiment result shows that the concentration of simulative aerosol decreases with capture time; large particlesin aerosol can beeasily captured; when the capture liquid dose reduced to the certain value,the result of aerosol particle capturing and encapsulating became better evidently with the increase of dose. The experiment that carried out in a241Am contaminated glove-box proved the radioactive aerosol concentration could reduce from 183 Bq / m3to 1. 51 Bq / m3after the capturing process. The radioactive concentration in the glove-box had no obvious change on the seventh day. Resuspension rate of the aerosol was 6. 5% when opened the ventilation at the fourteenth day. The capture liquid had good encapsulating result for radioactive aerosol and loose contamination.更多还原