With the development of peaceful uses of atomic energy, the works dealing with uranium compounds have recently increased in the country. In the uranium refinery, there are several uranium compounds dusts in the air and workers there may encounter hazards to inhale the dusts.
The concentrations of uranium in the air of a uranium refinery and in the urine of the workers were measured. Uranium was found to be in the range of 9.6×10-11-3.7×10-9g/l in the air of the refinery and, in the urine of the workers, in the range of 3.9×10-7-3.6×10-6g/l. The concentrations in the air are higher than that of natural level by order of two to four and those in the urines higher than those of the general public order of one. It is considered that these high levels in the urine are due to inhalation in higher concentrations of air borne uranium of the working environment.
