The exposure to grenz rays of office personnel handling a grenz-ray unit at 10 kV and a dose rate of 100 cGy per 10 seconds has been investigated for different treatment situations.
Scattered and leakage radiation and primary radiation at some distance from the grenz-ray unit were measured.
Air absorption was found to be most important. Direct exposure of the operator to the primary grenz-ray beam at a distance of 4 m was practically nil. At a distance of 2 m from the unit, the operator was permitted to be exposed 100 hours per year; at a distance of 1 m, the permitted exposure of the direct beam was 3 hours per year.
Scattered and leakage radiation from the unit was of no importance and certain clothing was demonstrated to promote absorption.(35)