RMI Nuclear Justice Documents

Side of Fuselage uy 2:21 2.6 Leading Edge 6.0 2:21 17.0 Tip Tank 1.5 2:26, 4.2 Since the two highest values represent impingement surfaces, « vuiue of 8 r/hr can be considered as a conservative value to represent the aircraft ag a whole. (Note that 6 r/hr fs more than three times the do-o rate on a typical sliding surface, such as the side of the fuselage.) The effective center of the body will be at least a foot from the aircraft surface. Experiment has shown that the gamma doserate at a distance of 1 foot from the surface is very near to half the surface doae rate. Hence, the whole-body dose rate can be taken to be half of the surface dose rate, or 4 r/hr at H + 1 hour. From this dose ratc, the whole body radiation dosa can be caloulated for various situa- tions through Equations 4.1 and 4.2. If exposure began at H + 2 hours and continued for 8 hours, the dose rate at the end of the period would be 0.25 r/hr. The accumulated dose would be § r. lf exposure began at H + 24 hours and continued for 8 hours, the dose rate at the end of the period would be 0.06 r/hr. The accumulated dose would be 0.6 r. If exposure began at h + 24 hours and continued at a rate of 8 hours per day for 10 consucutive days, the dose rate at the end of the tenth dry would be 0.005 r/hr. The acoumulated aose would be 1.2 r. These calculations aseume the extraume case, in which exposure fs continuous and the center of the body is only a foot trom tho surface of the most-highly coutaminated aircraft. In any actual siluatioa the dose would undoubtedly be amaller. These calculations were performed using the value of -1.2 as the siope of the decay curve for fission products. It was pointed out in Section 3.8 that the contamination on the aircraft aeems to decay with a slope of ~1.6. if this value had bee: uged in the computations made above, the accumulated cose would have been reduced by a factor of threa. 30 SECRET eo oe snaont pnathn DERE ah Aten ba SS a ae ee an aoe 25 r/hr maa inetd ee ek at aed ne Be oe Dose Rate at HH +1 H+ 2:18 etc Time 9 r/hr metens Measured Rate Air Intake ae Locstion It had the following surface dose ratea: ot a em ate A AetymePotRA eae ee a Aetne te otlnen tad penetrated the Shot Erie cloud.