Table 1. Island Dian- ial 9 9 of net inches 9 ? ? Plankton net per inch " 125 rT) 20 20 " Silk 173 " nt 20 n " ~- ‘-- 74 ? Number Meshes Mater- eter _ designnation " 12 6 6 or ” 20 " 6 6 1 74 7A " " " t " " " " ” tt " " " Nylon " " " Ww 12 Date of Date of 5-11-54 First count in uc/kg* ~-- Decay slope from date of il. 27 1 . 32 i. 35%e . first count- - - 1.08 - " Ash Wet ing to Oct. basis basis 30, 1957 83 -< " 140 - 1 . 73 1 . 70 ~ 1.76 - 1.72 ~ - 1.70 ~1 . 61 - 1.61 ~ 1.56 - 1.55 -i1 . 72 - 1.68 -~ 1.72 - - 1.32 2330 " it 2.1 4000 " 68 168 5.0 - 1.33 46 " 1-3-55 t ~—s(iw“ dQ 41 . 95 54 27 12 ay 25 " " 5 .8 1.8 93 4 .4 -20 -18 - 1.38 -1l. 4 - 5.3 - 1.58 73H # 1 . 53 -70 2.2 = - 1 . 73 6.4 6.9 37.1.5 58 " 95 +=" it it 2-22-55 2.7 " 10 4 " 12-8-54 8-11-54 168 3 .9 7-16-54 32 ft - 1.75 tf 104 ” 12-18-54 ' 1-28-55 © " '" 1-29-55 / 1-30-55 10-21-55 11-26-55 " " 10-22-55 O47 - O44 . 34 - 1.71 2.1 94 2.0 5. 5 .80 1 178 19 7 4 " " tt " 4.6 4.5 " il " 11] 8-23-56 10-24-55 11-27-55 7-23-55 " 6.2 " 3-26-54 collect-. first ing counting Levels and decay rates of beta radioactivity of Rongelap-ailinginae plankton, 1954-1957 Plate No. Atoll " lLabaredj uN " i" Kabelle 8202 8201 Rongelap 8303 " " 8239 " " " " "] 8240 19005 ” 20 19006 Kabelle Lukuen Rongelap 2] 173 74 20 6 ” " Labaredj 74. " 173 me 19019 74 173 " " "tt w Silk 1-26-55 20 173 " 10-23-55 74 n n 6 20 173 " Mo jiri-Enibuk 1 nl Labaredj " 20 74 157 " tt 6 " 20 157 t " Rongelap 8 1 2 157 " " " Kabelle " 2 T4 170 170 20 20 " " " 2 151 it " Rongelap 74 " 2 19020 nN ; 1 " 19025 it " 19024 " " " " " " " " " " 19072 Ww 6076 Rongelap nO 19074 tt & 19073 6077 19071 Allinginae 19070 19069 19067 19068 19031 19030 19029 19028 . 19026 19027 ‘Jos