Glass plates have been developed as high exposure dosimeters. They can be utilized in measuring absorbed dose in the range about 109and 1010rads. The principle of operation is based on the relationship between the absorbed dose and the increased loss of mass from the glass surface when it is etched in a 6% HI: solution from 5 to 50 minutes. The advantages of the technique are the low price of the dosimeter, reproducibility and possibility of working with a dose that saturates other dosimeters.