“ aot cptee Wy ea ba ae she emmaade dblee ER dreAaaihe En ed Sd -14- Beach sand Intertidal beach sand at Belle was sampled only twice, at the first and the last of the experimental period (Fig. 4). These er initial level than for island soil, and a some- ALICE SAND JANET . OLIVE VERA " | sparse data suggest & considerably low- BEACH r00 3 : what lower decline rate of -0.7. if ; ™ sruce . ciwen . nENry Lenoy Figure 8 shows for eight islands, and pre-Nectar lev- : els except at Elmer. As with island soil there was great variability, possibly because of the con-_,, tinual shifting the sand. The of . . | 0 ok. * beach sand declines , "0 o _ , opars ‘AprEeR may \", ise? northern islands were only slightly more : 0 _ 00 Fig. 8 radioactive than the southern islands, but the declines at the southern islands, especially Henry and Leroy, tended to be steeper than at the northern islands. The slower decline at northern than at southern islands is probably caused by 4 greater residue of radioactivity from previous detonations (higher pre-Nectar levels) at northern localities, possibly associated with the water currents. The decays for beach sand are given in Table 4, page 13. Except for Henry (Fig. 5), these are based upon only two mda 3 points. Beach sand decays were appreciably steeper at the southern than at the northern islands. The relationship between the slopes of declines and decays was inconsistent. At Henry decline slightly exceeded decay. At Leroy decays were steeper than declines, and at other localities differences were negligible. In general, decays were steeper than declines, although not convincingly so. 4 yy be, » AT” cy wT * mee