RO <i AIM Agr Coseas ED + The Model 1X-6 was to be manufactured in accordance with the : following specifications: a. b. ec. d. ‘Woight; 10 lbs. maximum. Maximum case dimensions; 4" x 6" x 10". Handle; hinged, polished unpainted metal or plastic. Case to be metal, heavy enoush for field use, Surface to be smooth for case of decontamination; anodized, lacquered or smooth paint finish (no ee f. g crackel-finish), Case to be water-proof tested under 5 feet of water for two hours, Detector cazponent to be an ionisation chamber containing sealed air at appreacimately 740 mn nereury pressure at 20° C, The instrument to be tropicalized in accordance with standard Army-Navy specifications, ° Following were the circuit requirements: a be Co It must be possible to check the zero setting in a field equal to the maximradiation neasured by the instruments, After 60 seconds warm-up period, the zero drift to be less than 59 of full scale per hour on any aANZes ive ranges of sensitivity were requested: 1, O-4 mr/hr 2. 0-40 me/hr he O-4,000 mr/hr yer dad. The microphonics to be held to a minimm, On any one of three one-inch drops produced by suddenly pulling a one~inch board from under one end of the instrument the meter reading would not fo over ee The instrument was to be calibrated by sanm rays fron radium and to conform to the sensitivities — a sy wy 0 Oe safe > ae z ae 5, O-40,000 mr/hr one~half full scale on any ranrce of sensitivity. specified in f, (c) above within an average of 10/3 of full scale at any point on the scale, The circuit to be so desi:med that after switching from one range to another not more than 10 seconds would be required to reach 90% of the final reading. -17 - \ 1 3e 0-400 mr/hr ~~