214 a processing of iodine throuzh ventod gases. T throuch very, very tall stacks, You set them uy into the higne atmospheres Where you have maximum possibility for dissipation of the activity. This experiment was set un to study the effects of chronic application of lodino to a large animal. We have quite a larse number of studics on small animals such as frogs, %. 3 "S population in the environs of the Hanford areca, and so ths QO. The sheep represent a rather significant 4 nice, et cetera, were used here to cetermino the exnosuro linits which will produces damage and to evalunte and define the pathnolicsy, tes histological representation of the carage wnen you do find it. When you do study this, you have to start with extrens ranges so that you will be sure to have a level which will shov damage and, likewise, levels which will not show camase. So, wa stazted out with loevois down on the order of .095 microcuries of I-131 fed to sheep per day and the maximum valus of 1299 nmicrocuries of I-131 fed to sheep per day. To give you an idea of what this represents, the lowest valu2 here is .005, which is the lowest value that you would give to the thyroid; tho MPC radiation is of .3 rads per week, so the lowest value was the MPC value for man. | As you can ses, it simply was not practical to continue it, because using the measure of the thyroid deficiency, tho uptake of jodine -- in other words, the thyroid will normally ae? pick up on the order of 20 percent of the iodine which is fed