freld test.* ustnp a phantonr man exposed Vo poth the tnitial and cesadiabh midnetion. Phe dept doses for each situation are shown in Fip. 5, with all date as per cent of the 3 centimeter dose. With the divereine taitial radiation from the port of explosion, (he exit dose wos seen to be 63 per cent of the 3 em dose, but with the diffuse residual treld of fission peoduct radi tion, a surface dose some ereht times greater than the 3 cor wtnd deeper dose trour the harder MAMA Components was observed, This is seen fo be ot (he same order ot maynitude as that estimated above. At hemhts above and below the 3 foot level (his surtace dose would become lower and higher respectively, but probably would not exceed 50 times the 3 toot air pamimnis dose or 80 times the midline dose, even in contact with the ground. An estimate of skin dose due to ground contamimition for the Rongelap case would result, for example, ina fipure of about 2000 rep to the dorsum of the foot, 600 rep at the hip fevel, and 300 rep at the bead it continuous exposure with no shielding occurred. Some reduction in dose undoubtedly resylted from shielding and movement, and it seems probable that the external beta dose Crom: local skin contamination fir outweihed that from the ground in importance, ‘This ts emphasized by the fact that clothing, probably reduced the beta dose from the ground by £0 to 20 per cen. *F. W. Chambers, Project 2.2b, Residual Gamma Depth Dose Measurements in UnitDensity Material, AFSWP, WT-719, Operation UPSHOT-KNOTHOLE. . . 23 aoa .