DURING 20TH CENTURY SHORTY AFTER ITS USAGE, IT WAS DISCOVERED THAT RADIATION COULD CAUSE CANCER AS WELL AS CURE IT. MANY EARLY RADIOLOGISTS USED THE SKIN OF THEIR ARMS TO TEST THE STRENGTH OF RADIATION FROM THEIR RADIOTHERAPY MACHINES, LOOKING FOR A DOSE THAT WOULD PRODUCE A PINK REACTION (ERYTHEMA) WHICH LOOKED LIKE SUNBURN. THEY CALLED THIS THE “ERYTHEMA DOSE,” AND THIS WAS CONSIDERED AN ESTIMATE OF THE PROPER DAILY FRACTION OF RADIATION. IT’S NO SURPRISE THAT MANY OF THEM DEVELOPED LEUKEMIA FROM REGULARLY EXPOSING THEMSELVES TO RADIATION.