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目的了解航道疏浚船作业时的辐射水平并提出相应的防护措施。方法通过模拟作业时监测泥浆浓度计周围环境的γ辐射空气吸收剂量率并和相关的防护标准相比较。结果在泥浆浓度计开启情况下,主射线方向区域内的γ辐射空气吸收剂量率和人员的受照剂量都超过国家相关标准要求,其它区域则不超标。结论目前对航道疏浚船放射源监管不到位,行业主管部门和相关职能部门应采取措施,如包裹防护铅板、设置隔离栏和定期对放射源周围环境的辐射剂量进行监测等来保护船员的身体健康。
Objective To understand the radiation level during the operation of waterway dredgers and propose corresponding protective measures. The method monitors the dose rate of gamma radiation absorbed by the atmosphere of the mud densitometer and compares it with the relevant protection standard by simulating the operation. Results When the mud densimeter was turned on, the absorbed dose rate of gamma radiation and the dose received by personnel in the main ray direction area exceeded the requirements of relevant national standards while the other areas did not exceed the standard. Conclusion At present, supervision of radioactive sources of waterway dredgers is not in place. Industry authorities and relevant functional departments should take measures such as wrapping protective lead plates, setting up barriers and regularly monitoring the radiation dose of the environment around radioactive sources to protect the crew members health.