Lee Angeles were of three main types,’ all based ex the same principle, to wit, acid formed from the irradiation ef a chlorinated hydrocarbon is @ linear function of radiation exposure throughout s broad range (25 to 100,000 r) (References 6, 18, 19, 80, ané 21). All dosimeters were of the direct-reading type, accompliahed by @veervation of eolor changes in the indicater dye. The eclor change in most iustances is from red (pi 6.0 or above) to yellow (pX 5.6 or belew). Since the color transition ef the indicator dye is a function of exposure, the exposure doses can be estimated by color comparison with irradiated controls. Evaluation of overexposures (pH 5.6 er below) are determined by the titration of the acid formed per millimeter of chlorinated hydrocerfoo with standardised 107) Normal NaOH. ‘he anoust of base required to return the overlaying acidinetric dye to ite preirradiation px value is a weasure of the acid produced by the absorbed dose. Use of predetermined date for the system in respect to sensitivity te Co™ game radiation (namely the milliequivalents ef acid protuced per milliliter ef ehlorinated hydrocarbon per roentgen gbsorved) anf division of these values into the acid produced by the uknowm exposure yields the gama Goses in roentgens. The Air Poree dosineters from Shots Cherokee and Zuni were read in the field by let Lt. 8. C. Sigoloff, USAF, of Project 4.2. ‘the rest of the dosineters were forwarded to the United States for reading and evaluation by the furnishing agency. a 2.2.4 Rediac Detector DT-60/MD. Project 2.72 supplied 175 DT-60's, end these were exposed to Ehots Flathead and Navajo. 25° ‘Those exposed to