CLEARING EXPERIMENT EXPOSURE RATES =tern (ux/hr) :s Llation Radius of Cleared Area insects - of the Along on ore :ruction mM areas; side ‘ high leter i@ area. ntion ‘faces. btained aring active xternal ptake O' 10' 20' 30' osure nmarized 47.2 48.6 50.8 52.2 5.2 5.2 5.5 5.7 +#5 sb Total As 9.1 8.6 8.0 8.5 61.5 | 62.4 64.3 66,4 59.0 59.0 59.9 60.5 reduction in the scattered radiation and thus little effect on the total exposure rate. The more important effect of the vegetation seems to be to enhance scattering of the radiation from emitters in the soil thereby producing a slightly softer energy spectrum. This effect more than conpensates for the increase in exposure rate at the detector due to radiation originating in the vegetation itself. The quantity of vegetation removed was staggering. As the brush was removed from the area, it was identified and weighed. These statistics are given below. VEGETATION REMOVED IN CLEARING EXPERIMENT| Arga Scaevola Pounds rometer es- 5° Co The slight increase in the total of the *°’Cs, S°co, and. +“5sb exposure rates indicates that there is possibly some increase in the unscattered gamma radiation affecting our partial exposure rate estimates, but there is a corresponding the ola oO ft. dings ny *27Cs 10 ft. of Aerial radius 10 - 20 ft. 20 - 30 £t. radius radius Total Dodonea Litter Portions 593 33 59 1717 2902 112 67 364 386 5212 212 809 - 25 f°