The photographic transmission density was read on an Ansco-McBeth Model 12 densitometer, with a calibrated photographic density wedge used as a standard. Exposures were determined by comparing densities of the field films with the density-versus-exposure curves for each film emulsion calibrated on the Cosource. TABLF 2.1 EXPOSURE RANGES OF THE EMULSIONS Emulsion Type Range r Du Pont Eastman 502 510 0.05 to 10 1.0 to 100 606 10.0 to 3,000 SO1112 50.0 to 2,500 548-0 de 548-0 sc 3,000 to 100,000 5,000 to 100,000 2.2.2 Quartz-Fiber Dosimeters. Seven ranges of quartz-fiber dosimeters, similar to the IM-93/UD evaluated by Teapot Project 6.1.1, were used (References 16 and 17). These dosimeters had an accuracy of +10 percent of true dose for Cogamma rays. The quartz-fiber dosimeters suffered serious errors because of rate dependence at rates higher than 105 r/hr; however, data from the instruments used did not exhibit these errors since such rates were avoided. These dosimeters were calibrated with the Co®™ source and a correction was made on all readings. All quartz-fiber dosimeters were continually checked for excessive leakage (>2 percent of full scale per day), and those showing excessive leakage were replaced. lists the manufacturer’s numbers and rariges. of 0 to 200 r. Table 2,2 Project 2.72 supplied 30 dosimeters with a range 2.2.3 Chemical Dosimeters. Chemical dosimeters furnished by the Air Force, Atomic Energy Commission, and University of California at Los Angeles were of three main types, all based on the same principle; to wit, acid formed from the irradiation of a chlorinated hydrocarbon is a linear function of radiation exposure throughout a broad range (25 to 100,000 r) (References 6, 18, 19, 20 and 21). These dosimeters had an accuracy of about 10 percent. All dosimeters were of the direct-reading type, accomplished by observation of color changes in the indicator dye. The color change in most instances was from red (pH 6.0 or above) to yelTABLE 2.2 QUARTZ-FIBER-DOSIMETER RANGES Bendix No. Range r 608 622 610 (IM-20/PD) 619 686 (IM-93/UD) 803 (IM-107) 0 0 0 0 0 0 0 to to to to to to to 10 20 50 100 600 2,000 200 low (pH 5.6 or below). Since the color transition of the indicator dye was a function of exposure, the exposure doses could be estimated by color comparison with irradiated controls. Evaluation of overexposures (pH 5.6 or below) was determined bythe titration of the acid formed per ml of chlorinated hydrocarbon with standardized 107? Normal NaOH. The amountof 15