For the past two and a half years this method has been in vogue in various hospitals, clinics, and offices throughout the country. The primary reasons for its adoption were the lack of supply of reliable radiometers and the ease and practicability of its application as compared with the intricate and exacting detail necessary for the proper use of various radiometers.
The method can be used with any standard interrupterless machine and Coolidge tube. It is not necessary to standardize each outfit, for one who is familiar with the apparatus oughtto master the technic of this method in a very short time, so that he can set and maintain the four factors constantly throughout the time of exposure.
The standard of all roentgen-ray dosage is known as the erythema dose; in other words, the quantity of roentgen-ray necessary to produce an erythema of the skin in from ten to fourteen