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交通部科学研究院的等离子焊接设备,是一种较新的焊接工艺。由于其所用钍钨棒中含有1.8～2.5%的放射性物质——钍。因此,在工作时,当焊接处温度很高的情况下,除产生强烈紫外线、各种有害气体(臭氧、氧化氮和金属烟尘等)外,还会产生少量钍的粉尘。空气中放射性粉尘浓度多大?表面放射性污染多强?γ外照射强度如何?对操作人员的健康有无危害?这些都是有关部门的同志希望回答的问题。
Ministry of Communications Institute of plasma welding equipment, is a relatively new welding process. Thorium tungsten rod because it contains 1.8 to 2.5% of the radioactive material - thorium. Therefore, at work, when the welding temperature is very high, a small amount of thorium dust will be generated in addition to the strong ultraviolet rays, various harmful gases (ozone, nitrogen oxides and metal soot, etc.). What is the concentration of radioactive dust in the air, how strong is the radioactive contamination on the surface, how is the intensity of gamma irradiation outside, and whether there is any danger to the health of the operators? These are questions that the comrades of the relevant departments wish to answer.