that the beta contribution to the Therefore, no attempt has been made to total LiF exposure rates'is roughly to calculate integrated beta doses in 25% at three separate sites within the interior of Bikini Island. ‘a manner similar to the gamma doses. Even However, if we assume that the beta though the beta to gamma ratios at to gamma ratio is constant throughout these sites are reasonably constant, the entire atoll, the additional dose it is still difficult to generalize due to the beta contribution will be about the variability of this ratio about 30% of the gamma doses for the throughout the entire atoll because of skin; about 1% for the eye lenses; differences in the mix of beta to and negligible for the gonads. gamma emitters in the soil and the the basis of these results, we believe density of the vegetative cover, which that the beta contribution plays a can provide shielding for the beta minor part in the total external dose radiation over the surrounding area. commitment. -22— On..-.. --.