天然铀矿石集装箱装卸码头作业场所辐射剂量率检测

Radiational dose detection for natural uranium container port

【目的】了解天然铀集装箱码头装卸场所辐射剂量率水平,为作业人员的职业健康管理提供依据。【方法】采用现场调查方法,了解天然铀集装箱装卸作业工艺流程、作业时间、作业频率等情况。使用辐射剂量率仪对168只天然铀集装箱外表面5 cm处辐射剂量率进行检测。同时抽取1只箱装箱,对除底面以外的5个表面5~200 cm距离的辐射剂量率水平进行检测。【结果】168个集装箱箱体表面5 cm处辐射剂量率水平范围为27~44μSv/h,平均剂量率水平35.6μSv/h。同一距离不同集装箱表面辐射剂量率水平有一定的差异,5、30、50、100、200 cm处的平均辐射剂量率水平分别为21.3、14.6、11.3、7.1、3.5μSv/h。码头作业人员正常作业暴露放射个人剂量估算值<580μSv/a。【结论】在正常作业时,天然铀集装箱外表面任意点辐射剂量率水平均远低于国家标准限值。

[Objective]To determine the level of radiation dose in port workplace for loading and unloading natural uranium ore containers,and to provide a basis for occupational health management of the operators.[Methods]Workplace investigation was conducted to understand the loading and unloading process of natural uranium ore containers,operation time and frequency,etc.A radiation dose rate meter was used to detect the radiation dose rate at 5 cm from the outer surface of 168 natural uranium ore containers.At the same time,we selected one container and detected the level of dose rate at 5-200 cm away from each side surface of the 5 container surfaces except for the bottom side.[Results]The dose rate level at 5 cm at outer surface of 168 containers ranged from 27μSv/h to 44μSv/h,and the average dose rate level was 35.6μSv/h.The average dose rate levels at 5,30,50,100 and 200 cm were 21.3,14.6,11.3,7.1 and 3.5μSv/h,respectively.In normal operation,the personal exposure dose of port worker were estimated to be less than 580μSv/a.[Conclusion]In normal operation,the dose rate level at any workplace on the outer surface of natural uranium ore container is far below the national standard limit.