The following assumptions are sade in estimating radiation deses to the lungs. A. Twenty per cent of the inhaled agtivity is deposited. B. There will be no elimination of particles during their radilo— active lifetimes. There (3s .ncertainty as to the blological half-life of particles ir the lungs. In those communities showing the highest concentrations of fallout, the peak of airborne material (whic! sceountedc for the greatest percen- tage of total fallout. oceurree only « few hours after detonation $f ome assume: » radiological desay acoording to t"*'* and a biologics, naif~life of say 30 days, the omission of biological half-.:fe wuld not affeet seriously tre computed total dose. DOE/NY. all of the activity 48 associated wits particles in the respirabie range of size: ‘ut data from cascade im: actors tndicate that about 90% of the activity is associ atec with particies 5 aicrons or leas ir the communities surrounding the Bevada ‘roving Grouncs. Dd. The lunge ere uniformly irraciated z. The weight of the lungs is 90: gras. r. An individual inhaies 2° cubi: meter» per 24 hours. yer “faee (ming eee