Decay of radionuclides from Fukushima Fallout

First 415 days

This table shows daily estimates of the relative percentage of activity attributable to each of the five long lived radionuclides released on March 16, 2011. These are based on soil sample analysis taken from J Village, 20km south of Fukushima Daiichi Nuclear Power Plant, and corrected to the initial date of the accident. The first 415 days are shown, at which time 131I, 136Cs, and 129mTe each contribute less than 0.1% of the activity.

The column labeled "Decay factor" is the amount of the original material that is still radioactive. It is expressed as a number where 1.0 represents March 16, 2011. This decay factor will approach (but never reach) 0.0 over time. This is the number used in the SPEIRT calculation.

 

Day # Date % 131I % 136Cs % 129mTe % 134Cs % 137Cs Decay factor
1 2011-03-16 90 0.4 6.5 1.5 1.6 99.9999
2 2011-03-17 89.3 0.4 6.9 1.6 1.8 92.3965
3 2011-03-18 88.6 0.4 7.4 1.7 1.9 85.4136
4 2011-03-19 87.9 0.4 7.8 1.9 2.1 78.9999
5 2011-03-20 87.1 0.4 8.2 2 2.2 73.1086
6 2011-03-21 86.3 0.4 8.7 2.2 2.4 67.6965
7 2011-03-22 85.4 0.4 9.2 2.3 2.6 62.7242
8 2011-03-23 84.5 0.4 9.7 2.5 2.8 58.1555
9 2011-03-24 83.5 0.4 10.3 2.7 3 53.9572
10 2011-03-25 82.5 0.4 10.8 2.9 3.3 50.0986
11 2011-03-26 81.5 0.5 11.4 3.1 3.5 46.552
12 2011-03-27 80.3 0.5 12 3.4 3.8 43.2915
13 2011-03-28 79.2 0.5 12.7 3.6 4.1 40.2937
14 2011-03-29 78 0.5 13.3 3.9 4.4 37.5371
15 2011-03-30 76.7 0.5 14 4.2 4.7 35.0017
16 2011-03-31 75.4 0.5 14.7 4.4 5 32.6694
17 2011-04-01 74 0.5 15.4 4.8 5.4 30.5236
18 2011-04-02 72.5 0.5 16.1 5.1 5.7 28.5489
19 2011-04-03 71.1 0.5 16.9 5.4 6.1 26.7314
20 2011-04-04 69.5 0.5 17.6 5.8 6.5 25.0581
21 2011-04-05 67.9 0.5 18.4 6.1 6.9 23.5172
22 2011-04-06 66.3 0.5 19.2 6.5 7.4 22.0979
23 2011-04-07 64.7 0.5 20 6.9 7.9 20.7903
24 2011-04-08 63 0.5 20.8 7.4 8.3 19.5853
25 2011-04-09 61.2 0.6 21.6 7.8 8.8 18.4744
26 2011-04-10 59.4 0.6 22.4 8.2 9.4 17.45
27 2011-04-11 57.6 0.6 23.2 8.7 9.9 16.505
28 2011-04-12 55.8 0.6 24 9.2 10.4 15.633
29 2011-04-13 54 0.6 24.8 9.7 11 14.8281
30 2011-04-14 52.1 0.6 25.5 10.2 11.6 14.0848
31 2011-04-15 50.3 0.6 26.3 10.7 12.2 13.3981
32 2011-04-16 48.4 0.6 27.1 11.2 12.8 12.7634
33 2011-04-17 46.5 0.5 27.8 11.7 13.4 12.1766
34 2011-04-18 44.7 0.5 28.5 12.3 14 11.6337
35 2011-04-19 42.8 0.5 29.2 12.8 14.7 11.1312
36 2011-04-20 41 0.5 29.8 13.4 15.3 10.6658
37 2011-04-21 39.2 0.5 30.4 13.9 15.9 10.2347
38 2011-04-22 37.4 0.5 31 14.5 16.6 9.835
39 2011-04-23 35.6 0.5 31.6 15 17.2 9.4642
40 2011-04-24 33.9 0.5 32.1 15.6 17.9 9.12
41 2011-04-25 32.2 0.5 32.6 16.1 18.5 8.8003
42 2011-04-26 30.6 0.5 33 16.7 19.2 8.5032
43 2011-04-27 29 0.5 33.4 17.2 19.8 8.2268
44 2011-04-28 27.5 0.5 33.8 17.8 20.5 7.9696
45 2011-04-29 26 0.5 34.2 18.3 21.1 7.73
46 2011-04-30 24.5 0.4 34.5 18.8 21.7 7.5066
47 2011-05-01 23.2 0.4 34.7 19.3 22.4 7.2981
48 2011-05-02 21.8 0.4 34.9 19.9 23 7.1035
49 2011-05-03 20.5 0.4 35.1 20.4 23.6 6.9215
50 2011-05-04 19.3 0.4 35.3 20.9 24.2 6.7513
51 2011-05-05 18.1 0.4 35.4 21.3 24.7 6.592
52 2011-05-06 17 0.4 35.5 21.8 25.3 6.4426
53 2011-05-07 16 0.4 35.5 22.3 25.9 6.3025
54 2011-05-08 15 0.4 35.5 22.7 26.4 6.1709
55 2011-05-09 14 0.3 35.5 23.2 27 6.0472
56 2011-05-10 13.1 0.3 35.5 23.6 27.5 5.9308
57 2011-05-11 12.2 0.3 35.4 24 28 5.8212
58 2011-05-12 11.4 0.3 35.3 24.4 28.5 5.7178
59 2011-05-13 10.7 0.3 35.2 24.8 29 5.6202
60 2011-05-14 9.9 0.3 35.1 25.2 29.5 5.528
61 2011-05-15 9.3 0.3 34.9 25.6 30 5.4407
62 2011-05-16 8.6 0.3 34.7 26 30.4 5.3581
63 2011-05-17 8 0.3 34.5 26.3 30.9 5.2797
64 2011-05-18 7.5 0.3 34.3 26.7 31.3 5.2054
65 2011-05-19 6.9 0.2 34 27 31.7 5.1347
66 2011-05-20 6.5 0.2 33.8 27.4 32.2 5.0675
67 2011-05-21 6 0.2 33.5 27.7 32.6 5.0034
68 2011-05-22 5.6 0.2 33.2 28 33 4.9424
69 2011-05-23 5.2 0.2 33 28.3 33.4 4.8842
70 2011-05-24 4.8 0.2 32.6 28.6 33.7 4.8285
71 2011-05-25 4.4 0.2 32.3 28.9 34.1 4.7753
72 2011-05-26 4.1 0.2 32 29.2 34.5 4.7244
73 2011-05-27 3.8 0.2 31.7 29.5 34.8 4.6755
74 2011-05-28 3.5 0.2 31.4 29.7 35.2 4.6287
75 2011-05-29 3.3 0.2 31 30 35.5 4.5837
76 2011-05-30 3 0.2 30.7 30.3 35.9 4.5405
77 2011-05-31 2.8 0.1 30.3 30.5 36.2 4.499
78 2011-06-01 2.6 0.1 30 30.8 36.5 4.4589
79 2011-06-02 2.4 0.1 29.6 31 36.8 4.4203
80 2011-06-03 2.2 0.1 29.3 31.2 37.1 4.3831
81 2011-06-04 2.1 0.1 28.9 31.5 37.4 4.3472
82 2011-06-05 1.9 0.1 28.5 31.7 37.7 4.3125
83 2011-06-06 1.8 0.1 28.2 31.9 38 4.279
84 2011-06-07 1.6 0.1 27.8 32.1 38.3 4.2465
85 2011-06-08 1.5 0.1 27.4 32.3 38.6 4.2151
86 2011-06-09 1.4 0.1 27.1 32.5 38.9 4.1847
87 2011-06-10 1.3 0.1 26.7 32.7 39.2 4.1552
88 2011-06-11 1.2 0.1 26.4 32.9 39.4 4.1265
89 2011-06-12 1.1 0.1 26 33.1 39.7 4.0987
90 2011-06-13 1 0.1 25.6 33.3 40 4.0717
91 2011-06-14 0.9 0.1 25.3 33.5 40.2 4.0455
92 2011-06-15 0.9 0.1 24.9 33.7 40.5 4.02
93 2011-06-16 0.8 0.1 24.6 33.9 40.7 3.9952
94 2011-06-17 0.7 0.1 24.2 34 41 3.9711
95 2011-06-18 0.7 0.1 23.8 34.2 41.2 3.9476
96 2011-06-19 0.6 0.1 23.5 34.4 41.4 3.9246
97 2011-06-20 0.6 0.1 23.1 34.5 41.7 3.9023
98 2011-06-21 0.5 0.1 22.8 34.7 41.9 3.8806
99 2011-06-22 0.5 0.1 22.5 34.9 42.1 3.8593
100 2011-06-23 0.5 0.1 22.1 35 42.4 3.8386
101 2011-06-24 0.4 0 21.8 35.2 42.6 3.8184
102 2011-06-25 0.4 0 21.4 35.3 42.8 3.7987
103 2011-06-26 0.4 0 21.1 35.5 43 3.7794
104 2011-06-27 0.3 0 20.8 35.6 43.2 3.7606
105 2011-06-28 0.3 0 20.5 35.8 43.4 3.7422
106 2011-06-29 0.3 0 20.1 35.9 43.6 3.7243
107 2011-06-30 0.3 0 19.8 36 43.8 3.7067
108 2011-07-01 0.2 0 19.5 36.2 44 3.6895
109 2011-07-02 0.2 0 19.2 36.3 44.2 3.6727
110 2011-07-03 0.2 0 18.9 36.4 44.4 3.6562
111 2011-07-04 0.2 0 18.6 36.6 44.6 3.6401
112 2011-07-05 0.2 0 18.3 36.7 44.8 3.6244
113 2011-07-06 0.2 0 18 36.8 45 3.609
114 2011-07-07 0.1 0 17.7 36.9 45.2 3.5939
115 2011-07-08 0.1 0 17.4 37 45.4 3.5791
116 2011-07-09 0.1 0 17.1 37.2 45.6 3.5646
117 2011-07-10 0.1 0 16.8 37.3 45.7 3.5504
118 2011-07-11 0.1 0 16.6 37.4 45.9 3.5365
119 2011-07-12 0.1 0 16.3 37.5 46.1 3.5229
120 2011-07-13 0.1 0 16 37.6 46.3 3.5096
121 2011-07-14 0.1 0 15.7 37.7 46.4 3.4965
122 2011-07-15 0.1 0 15.5 37.8 46.6 3.4837
123 2011-07-16 0.1 0 15.2 37.9 46.8 3.4711
124 2011-07-17 0.1 0 15 38 46.9 3.4588
125 2011-07-18 0.1 0 14.7 38.1 47.1 3.4467
126 2011-07-19 0.1 0 14.5 38.2 47.3 3.4348
127 2011-07-20 0 0 14.2 38.3 47.4 3.4232
128 2011-07-21 0 0 14 38.4 47.6 3.4118
129 2011-07-22 0 0 13.7 38.5 47.7 3.4006
130 2011-07-23 0 0 13.5 38.6 47.9 3.3896
131 2011-07-24 0 0 13.3 38.7 48 3.3789
132 2011-07-25 0 0 13 38.8 48.2 3.3683
133 2011-07-26 0 0 12.8 38.8 48.3 3.3579
134 2011-07-27 0 0 12.6 38.9 48.5 3.3478
135 2011-07-28 0 0 12.4 39 48.6 3.3378
136 2011-07-29 0 0 12.1 39.1 48.7 3.328
137 2011-07-30 0 0 11.9 39.2 48.9 3.3183
138 2011-07-31 0 0 11.7 39.2 49 3.3089
139 2011-08-01 0 0 11.5 39.3 49.2 3.2996
140 2011-08-02 0 0 11.3 39.4 49.3 3.2905
141 2011-08-03 0 0 11.1 39.5 49.4 3.2816
142 2011-08-04 0 0 10.9 39.5 49.5 3.2728
143 2011-08-05 0 0 10.7 39.6 49.7 3.2642
144 2011-08-06 0 0 10.5 39.7 49.8 3.2557
145 2011-08-07 0 0 10.3 39.7 49.9 3.2474
146 2011-08-08 0 0 10.1 39.8 50 3.2392
147 2011-08-09 0 0 10 39.8 50.2 3.2311
148 2011-08-10 0 0 9.8 39.9 50.3 3.2233
149 2011-08-11 0 0 9.6 40 50.4 3.2155
150 2011-08-12 0 0 9.4 40 50.5 3.2079
151 2011-08-13 0 0 9.3 40.1 50.6 3.2004
152 2011-08-14 0 0 9.1 40.1 50.8 3.193
153 2011-08-15 0 0 8.9 40.2 50.9 3.1858
154 2011-08-16 0 0 8.8 40.2 51 3.1787
155 2011-08-17 0 0 8.6 40.3 51.1 3.1717
156 2011-08-18 0 0 8.4 40.3 51.2 3.1648
157 2011-08-19 0 0 8.3 40.4 51.3 3.1581
158 2011-08-20 0 0 8.1 40.4 51.4 3.1514
159 2011-08-21 0 0 8 40.5 51.5 3.1449
160 2011-08-22 0 0 7.8 40.5 51.6 3.1385
161 2011-08-23 0 0 7.7 40.6 51.7 3.1322
162 2011-08-24 0 0 7.6 40.6 51.8 3.126
163 2011-08-25 0 0 7.4 40.7 51.9 3.1199
164 2011-08-26 0 0 7.3 40.7 52 3.1139
165 2011-08-27 0 0 7.1 40.7 52.1 3.108
166 2011-08-28 0 0 7 40.8 52.2 3.1022
167 2011-08-29 0 0 6.9 40.8 52.3 3.0964
168 2011-08-30 0 0 6.8 40.9 52.4 3.0908
169 2011-08-31 0 0 6.6 40.9 52.5 3.0853
170 2011-09-01 0 0 6.5 40.9 52.6 3.0798
171 2011-09-02 0 0 6.4 41 52.6 3.0745
172 2011-09-03 0 0 6.3 41 52.7 3.0692
173 2011-09-04 0 0 6.1 41 52.8 3.064
174 2011-09-05 0 0 6 41.1 52.9 3.0589
175 2011-09-06 0 0 5.9 41.1 53 3.0539
176 2011-09-07 0 0 5.8 41.1 53.1 3.0489
177 2011-09-08 0 0 5.7 41.1 53.2 3.0441
178 2011-09-09 0 0 5.6 41.2 53.2 3.0393
179 2011-09-10 0 0 5.5 41.2 53.3 3.0346
180 2011-09-11 0 0 5.4 41.2 53.4 3.0299
181 2011-09-12 0 0 5.3 41.3 53.5 3.0253
182 2011-09-13 0 0 5.2 41.3 53.5 3.0208
183 2011-09-14 0 0 5.1 41.3 53.6 3.0164
184 2011-09-15 0 0 5 41.3 53.7 3.012
185 2011-09-16 0 0 4.9 41.3 53.8 3.0077
186 2011-09-17 0 0 4.8 41.4 53.8 3.0034
187 2011-09-18 0 0 4.7 41.4 53.9 2.9992
188 2011-09-19 0 0 4.6 41.4 54 2.9951
189 2011-09-20 0 0 4.5 41.4 54.1 2.9911
190 2011-09-21 0 0 4.4 41.4 54.1 2.9871
191 2011-09-22 0 0 4.4 41.5 54.2 2.9831
192 2011-09-23 0 0 4.3 41.5 54.3 2.9792
193 2011-09-24 0 0 4.2 41.5 54.3 2.9754
194 2011-09-25 0 0 4.1 41.5 54.4 2.9716
195 2011-09-26 0 0 4 41.5 54.5 2.9679
196 2011-09-27 0 0 4 41.5 54.5 2.9642
197 2011-09-28 0 0 3.9 41.5 54.6 2.9606
198 2011-09-29 0 0 3.8 41.6 54.6 2.957
199 2011-09-30 0 0 3.7 41.6 54.7 2.9535
200 2011-10-01 0 0 3.7 41.6 54.8 2.95
201 2011-10-02 0 0 3.6 41.6 54.8 2.9465
202 2011-10-03 0 0 3.5 41.6 54.9 2.9432
203 2011-10-04 0 0 3.4 41.6 54.9 2.9398
204 2011-10-05 0 0 3.4 41.6 55 2.9365
205 2011-10-06 0 0 3.3 41.6 55.1 2.9333
206 2011-10-07 0 0 3.3 41.6 55.1 2.9301
207 2011-10-08 0 0 3.2 41.6 55.2 2.9269
208 2011-10-09 0 0 3.1 41.6 55.2 2.9238
209 2011-10-10 0 0 3.1 41.6 55.3 2.9207
210 2011-10-11 0 0 3 41.6 55.3 2.9176
211 2011-10-12 0 0 3 41.7 55.4 2.9146
212 2011-10-13 0 0 2.9 41.7 55.4 2.9116
213 2011-10-14 0 0 2.8 41.7 55.5 2.9087
214 2011-10-15 0 0 2.8 41.7 55.6 2.9058
215 2011-10-16 0 0 2.7 41.7 55.6 2.9029
216 2011-10-17 0 0 2.7 41.7 55.7 2.9001
217 2011-10-18 0 0 2.6 41.7 55.7 2.8973
218 2011-10-19 0 0 2.6 41.7 55.8 2.8945
219 2011-10-20 0 0 2.5 41.7 55.8 2.8918
220 2011-10-21 0 0 2.5 41.7 55.9 2.8891
221 2011-10-22 0 0 2.4 41.7 55.9 2.8865
222 2011-10-23 0 0 2.4 41.7 55.9 2.8838
223 2011-10-24 0 0 2.3 41.7 56 2.8812
224 2011-10-25 0 0 2.3 41.7 56 2.8786
225 2011-10-26 0 0 2.2 41.7 56.1 2.8761
226 2011-10-27 0 0 2.2 41.7 56.1 2.8736
227 2011-10-28 0 0 2.2 41.7 56.2 2.8711
228 2011-10-29 0 0 2.1 41.7 56.2 2.8686
229 2011-10-30 0 0 2.1 41.7 56.3 2.8662
230 2011-10-31 0 0 2 41.7 56.3 2.8638
231 2011-11-01 0 0 2 41.7 56.4 2.8614
232 2011-11-02 0 0 2 41.7 56.4 2.859
233 2011-11-03 0 0 1.9 41.6 56.4 2.8567
234 2011-11-04 0 0 1.9 41.6 56.5 2.8544
235 2011-11-05 0 0 1.8 41.6 56.5 2.8521
236 2011-11-06 0 0 1.8 41.6 56.6 2.8498
237 2011-11-06 0 0 1.8 41.6 56.6 2.8476
238 2011-11-07 0 0 1.7 41.6 56.6 2.8454
239 2011-11-08 0 0 1.7 41.6 56.7 2.8432
240 2011-11-09 0 0 1.7 41.6 56.7 2.841
241 2011-11-10 0 0 1.6 41.6 56.8 2.8389
242 2011-11-11 0 0 1.6 41.6 56.8 2.8367
243 2011-11-12 0 0 1.6 41.6 56.8 2.8346
244 2011-11-13 0 0 1.5 41.6 56.9 2.8325
245 2011-11-14 0 0 1.5 41.6 56.9 2.8304
246 2011-11-15 0 0 1.5 41.6 57 2.8284
247 2011-11-16 0 0 1.4 41.6 57 2.8264
248 2011-11-17 0 0 1.4 41.5 57 2.8243
249 2011-11-18 0 0 1.4 41.5 57.1 2.8223
250 2011-11-19 0 0 1.4 41.5 57.1 2.8204
251 2011-11-20 0 0 1.3 41.5 57.1 2.8184
252 2011-11-21 0 0 1.3 41.5 57.2 2.8165
253 2011-11-22 0 0 1.3 41.5 57.2 2.8145
254 2011-11-23 0 0 1.3 41.5 57.2 2.8126
255 2011-11-24 0 0 1.2 41.5 57.3 2.8107
256 2011-11-25 0 0 1.2 41.5 57.3 2.8088
257 2011-11-26 0 0 1.2 41.5 57.4 2.807
258 2011-11-27 0 0 1.2 41.5 57.4 2.8051
259 2011-11-28 0 0 1.1 41.4 57.4 2.8033
260 2011-11-29 0 0 1.1 41.4 57.5 2.8015
261 2011-11-30 0 0 1.1 41.4 57.5 2.7997
262 2011-12-01 0 0 1.1 41.4 57.5 2.7979
263 2011-12-02 0 0 1.1 41.4 57.6 2.7961
264 2011-12-03 0 0 1 41.4 57.6 2.7943
265 2011-12-04 0 0 1 41.4 57.6 2.7926
266 2011-12-05 0 0 1 41.4 57.7 2.7908
267 2011-12-06 0 0 1 41.3 57.7 2.7891
268 2011-12-07 0 0 1 41.3 57.7 2.7874
269 2011-12-08 0 0 0.9 41.3 57.7 2.7857
270 2011-12-09 0 0 0.9 41.3 57.8 2.784
271 2011-12-10 0 0 0.9 41.3 57.8 2.7823
272 2011-12-11 0 0 0.9 41.3 57.8 2.7807
273 2011-12-12 0 0 0.9 41.3 57.9 2.779
274 2011-12-13 0 0 0.8 41.3 57.9 2.7774
275 2011-12-14 0 0 0.8 41.2 57.9 2.7757
276 2011-12-15 0 0 0.8 41.2 58 2.7741
277 2011-12-16 0 0 0.8 41.2 58 2.7725
278 2011-12-17 0 0 0.8 41.2 58 2.7709
279 2011-12-18 0 0 0.8 41.2 58.1 2.7693
280 2011-12-19 0 0 0.7 41.2 58.1 2.7677
281 2011-12-20 0 0 0.7 41.2 58.1 2.7661
282 2011-12-21 0 0 0.7 41.1 58.1 2.7646
283 2011-12-22 0 0 0.7 41.1 58.2 2.763
284 2011-12-23 0 0 0.7 41.1 58.2 2.7615
285 2011-12-24 0 0 0.7 41.1 58.2 2.76
286 2011-12-25 0 0 0.7 41.1 58.3 2.7584
287 2011-12-26 0 0 0.7 41.1 58.3 2.7569
288 2011-12-27 0 0 0.6 41.1 58.3 2.7554
289 2011-12-28 0 0 0.6 41 58.3 2.7539
290 2011-12-29 0 0 0.6 41 58.4 2.7524
291 2011-12-30 0 0 0.6 41 58.4 2.7509
292 2011-12-31 0 0 0.6 41 58.4 2.7495
293 2012-01-01 0 0 0.6 41 58.5 2.748
294 2012-01-02 0 0 0.6 41 58.5 2.7465
295 2012-01-03 0 0 0.6 40.9 58.5 2.7451
296 2012-01-04 0 0 0.5 40.9 58.5 2.7436
297 2012-01-05 0 0 0.5 40.9 58.6 2.7422
298 2012-01-06 0 0 0.5 40.9 58.6 2.7408
299 2012-01-07 0 0 0.5 40.9 58.6 2.7394
300 2012-01-08 0 0 0.5 40.9 58.6 2.7379
301 2012-01-09 0 0 0.5 40.8 58.7 2.7365
302 2012-01-10 0 0 0.5 40.8 58.7 2.7351
303 2012-01-11 0 0 0.5 40.8 58.7 2.7337
304 2012-01-12 0 0 0.5 40.8 58.7 2.7323
305 2012-01-13 0 0 0.5 40.8 58.8 2.731
306 2012-01-14 0 0 0.4 40.8 58.8 2.7296
307 2012-01-15 0 0 0.4 40.7 58.8 2.7282
308 2012-01-16 0 0 0.4 40.7 58.8 2.7268
309 2012-01-17 0 0 0.4 40.7 58.9 2.7255
310 2012-01-18 0 0 0.4 40.7 58.9 2.7241
311 2012-01-19 0 0 0.4 40.7 58.9 2.7228
312 2012-01-20 0 0 0.4 40.7 59 2.7214
313 2012-01-21 0 0 0.4 40.6 59 2.7201
314 2012-01-22 0 0 0.4 40.6 59 2.7188
315 2012-01-23 0 0 0.4 40.6 59 2.7175
316 2012-01-24 0 0 0.4 40.6 59.1 2.7161
317 2012-01-25 0 0 0.4 40.6 59.1 2.7148
318 2012-01-26 0 0 0.3 40.6 59.1 2.7135
319 2012-01-27 0 0 0.3 40.5 59.1 2.7122
320 2012-01-28 0 0 0.3 40.5 59.1 2.7109
321 2012-01-29 0 0 0.3 40.5 59.2 2.7096
322 2012-01-30 0 0 0.3 40.5 59.2 2.7083
323 2012-01-31 0 0 0.3 40.5 59.2 2.707
324 2012-02-01 0 0 0.3 40.4 59.2 2.7057
325 2012-02-02 0 0 0.3 40.4 59.3 2.7045
326 2012-02-03 0 0 0.3 40.4 59.3 2.7032
327 2012-02-04 0 0 0.3 40.4 59.3 2.7019
328 2012-02-05 0 0 0.3 40.4 59.3 2.7007
329 2012-02-06 0 0 0.3 40.4 59.4 2.6994
330 2012-02-07 0 0 0.3 40.3 59.4 2.6981
331 2012-02-08 0 0 0.3 40.3 59.4 2.6969
332 2012-02-09 0 0 0.3 40.3 59.4 2.6956
333 2012-02-10 0 0 0.3 40.3 59.5 2.6944
334 2012-02-11 0 0 0.3 40.3 59.5 2.6932
335 2012-02-12 0 0 0.2 40.2 59.5 2.6919
336 2012-02-13 0 0 0.2 40.2 59.5 2.6907
337 2012-02-14 0 0 0.2 40.2 59.6 2.6895
338 2012-02-15 0 0 0.2 40.2 59.6 2.6882
339 2012-02-16 0 0 0.2 40.2 59.6 2.687
340 2012-02-17 0 0 0.2 40.1 59.6 2.6858
341 2012-02-18 0 0 0.2 40.1 59.7 2.6846
342 2012-02-19 0 0 0.2 40.1 59.7 2.6834
343 2012-02-20 0 0 0.2 40.1 59.7 2.6822
344 2012-02-21 0 0 0.2 40.1 59.7 2.681
345 2012-02-22 0 0 0.2 40.1 59.7 2.6798
346 2012-02-23 0 0 0.2 40 59.8 2.6786
347 2012-02-24 0 0 0.2 40 59.8 2.6774
348 2012-02-25 0 0 0.2 40 59.8 2.6762
349 2012-02-26 0 0 0.2 40 59.8 2.675
350 2012-02-27 0 0 0.2 40 59.9 2.6738
351 2012-02-28 0 0 0.2 39.9 59.9 2.6726
352 2012-02-29 0 0 0.2 39.9 59.9 2.6714
353 2012-03-01 0 0 0.2 39.9 59.9 2.6703
354 2012-03-02 0 0 0.2 39.9 59.9 2.6691
355 2012-03-03 0 0 0.2 39.9 60 2.6679
356 2012-03-04 0 0 0.2 39.8 60 2.6668
357 2012-03-05 0 0 0.2 39.8 60 2.6656
358 2012-03-06 0 0 0.2 39.8 60 2.6644
359 2012-03-07 0 0 0.2 39.8 60.1 2.6633
360 2012-03-08 0 0 0.1 39.8 60.1 2.6621
361 2012-03-09 0 0 0.1 39.7 60.1 2.661
362 2012-03-10 0 0 0.1 39.7 60.1 2.6598
363 2012-03-12 0 0 0.1 39.7 60.1 2.6587
364 2012-03-13 0 0 0.1 39.7 60.2 2.6575
365 2012-03-14 0 0 0.1 39.7 60.2 2.6564
366 2012-03-15 0 0 0.1 39.7 60.2 2.6552
367 2012-03-16 0 0 0.1 39.6 60.2 2.6541
368 2012-03-17 0 0 0.1 39.6 60.3 2.6529
369 2012-03-18 0 0 0.1 39.6 60.3 2.6518
370 2012-03-19 0 0 0.1 39.6 60.3 2.6507
371 2012-03-20 0 0 0.1 39.6 60.3 2.6495
372 2012-03-21 0 0 0.1 39.5 60.3 2.6484
373 2012-03-22 0 0 0.1 39.5 60.4 2.6473
374 2012-03-23 0 0 0.1 39.5 60.4 2.6462
375 2012-03-24 0 0 0.1 39.5 60.4 2.645
376 2012-03-25 0 0 0.1 39.5 60.4 2.6439
377 2012-03-26 0 0 0.1 39.4 60.5 2.6428
378 2012-03-27 0 0 0.1 39.4 60.5 2.6417
379 2012-03-28 0 0 0.1 39.4 60.5 2.6406
380 2012-03-29 0 0 0.1 39.4 60.5 2.6395
381 2012-03-30 0 0 0.1 39.4 60.5 2.6384
382 2012-03-31 0 0 0.1 39.3 60.6 2.6373
383 2012-04-01 0 0 0.1 39.3 60.6 2.6361
384 2012-04-02 0 0 0.1 39.3 60.6 2.635
385 2012-04-03 0 0 0.1 39.3 60.6 2.6339
386 2012-04-04 0 0 0.1 39.3 60.7 2.6328
387 2012-04-05 0 0 0.1 39.2 60.7 2.6317
388 2012-04-06 0 0 0.1 39.2 60.7 2.6307
389 2012-04-07 0 0 0.1 39.2 60.7 2.6296
390 2012-04-08 0 0 0.1 39.2 60.7 2.6285
391 2012-04-09 0 0 0.1 39.2 60.8 2.6274
392 2012-04-10 0 0 0.1 39.1 60.8 2.6263
393 2012-04-11 0 0 0.1 39.1 60.8 2.6252
394 2012-04-12 0 0 0.1 39.1 60.8 2.6241
395 2012-04-13 0 0 0.1 39.1 60.8 2.623
396 2012-04-14 0 0 0.1 39.1 60.9 2.6219
397 2012-04-15 0 0 0.1 39 60.9 2.6209
398 2012-04-16 0 0 0.1 39 60.9 2.6198
399 2012-04-17 0 0 0.1 39 60.9 2.6187
400 2012-04-18 0 0 0.1 39 60.9 2.6176
401 2012-04-19 0 0 0.1 39 61 2.6166
402 2012-04-20 0 0 0.1 38.9 61 2.6155
403 2012-04-21 0 0 0.1 38.9 61 2.6144
404 2012-04-22 0 0 0.1 38.9 61 2.6134
405 2012-04-23 0 0 0.1 38.9 61.1 2.6123
406 2012-04-24 0 0 0.1 38.9 61.1 2.6112
407 2012-04-25 0 0 0.1 38.8 61.1 2.6102
408 2012-04-26 0 0 0.1 38.8 61.1 2.6091
409 2012-04-27 0 0 0.1 38.8 61.1 2.608
410 2012-04-28 0 0 0.1 38.8 61.2 2.607
411 2012-04-29 0 0 0.1 38.8 61.2 2.6059
412 2012-04-30 0 0 0.1 38.7 61.2 2.6049
413 2012-05-01 0 0 0.1 38.7 61.2 2.6038
414 2012-05-02 0 0 0.1 38.7 61.2 2.6027
415 2012-05-03 0 0 0 38.7 61.3 2.6017
717 2013-02-28 0 0 0 32.8 67.2 2.3264

First 100 years

This table shows estimates of the relative percentage of activity attributable to 134Cs and 137Cs during the first century. Note that after 24 years, 134Cs contributes less than 0.1% of the activity.

 

Year # Date % 131I % 136Cs % 129mTe % 134Cs % 137Cs Decay factor
0 2011-03-16 90 0.4 6.5 1.5 1.6 99.9999
1 2012-03-15 0 0 0.1 39.7 60.2 2.6552
2 2013-03-15 0 0 0 32.5 67.5 2.3153
3 2014-03-15 0 0 0 26.1 73.9 2.0651
4 2015-03-16 0 0 0 20.5 79.5 1.877
5 2016-03-15 0 0 0 15.9 84.1 1.7333
6 2017-03-15 0 0 0 12.1 87.9 1.6217
7 2018-03-15 0 0 0 9.2 90.8 1.5331
8 2019-03-16 0 0 0 6.9 93.1 1.4613
9 2020-03-15 0 0 0 5.1 94.9 1.4017
10 2021-03-15 0 0 0 3.8 96.2 1.3509
11 2022-03-15 0 0 0 2.8 97.2 1.3067
12 2023-03-16 0 0 0 2.1 97.9 1.2673
13 2024-03-15 0 0 0 1.5 98.5 1.2315
14 2025-03-15 0 0 0 1.1 98.9 1.1985
15 2026-03-15 0 0 0 0.8 99.2 1.1677
16 2027-03-16 0 0 0 0.6 99.4 1.1386
17 2028-03-15 0 0 0 0.4 99.6 1.1109
18 2029-03-15 0 0 0 0.3 99.7 1.0843
19 2030-03-15 0 0 0 0.2 99.8 1.0587
20 2031-03-16 0 0 0 0.2 99.8 1.0339
21 2032-03-15 0 0 0 0.1 99.9 1.0099
22 2033-03-15 0 0 0 0.1 99.9 0.9865
23 2034-03-15 0 0 0 0.1 99.9 0.9638
24 2035-03-16 0 0 0 0 100 0.9417
25 2036-03-15 0 0 0 0 100 0.9202
26 2037-03-15 0 0 0 0 100 0.8991
27 2038-03-15 0 0 0 0 100 0.8786
28 2039-03-15 0 0 0 0 100 0.8585
29 2040-03-15 0 0 0 0 100 0.8389
30 2041-03-15 0 0 0 0 100 0.8198
31 2042-03-15 0 0 0 0 100 0.8011
32 2043-03-15 0 0 0 0 100 0.7829
33 2044-03-15 0 0 0 0 100 0.765
34 2045-03-15 0 0 0 0 100 0.7476
35 2046-03-15 0 0 0 0 100 0.7306
36 2047-03-15 0 0 0 0 100 0.7139
37 2048-03-15 0 0 0 0 100 0.6977
38 2049-03-15 0 0 0 0 100 0.6818
39 2050-03-15 0 0 0 0 100 0.6663
40 2051-03-15 0 0 0 0 100 0.6511
41 2052-03-15 0 0 0 0 100 0.6363
42 2053-03-15 0 0 0 0 100 0.6218
43 2054-03-15 0 0 0 0 100 0.6076
44 2055-03-15 0 0 0 0 100 0.5938
45 2056-03-15 0 0 0 0 100 0.5802
46 2057-03-15 0 0 0 0 100 0.567
47 2058-03-15 0 0 0 0 100 0.5541
48 2059-03-15 0 0 0 0 100 0.5415
49 2060-03-15 0 0 0 0 100 0.5292
50 2061-03-15 0 0 0 0 100 0.5171
51 2062-03-15 0 0 0 0 100 0.5053
52 2063-03-15 0 0 0 0 100 0.4938
53 2064-03-15 0 0 0 0 100 0.4826
54 2065-03-15 0 0 0 0 100 0.4716
55 2066-03-15 0 0 0 0 100 0.4609
56 2067-03-15 0 0 0 0 100 0.4504
57 2068-03-15 0 0 0 0 100 0.4401
58 2069-03-15 0 0 0 0 100 0.4301
59 2070-03-15 0 0 0 0 100 0.4203
60 2071-03-15 0 0 0 0 100 0.4107
61 2072-03-15 0 0 0 0 100 0.4014
62 2073-03-15 0 0 0 0 100 0.3922
63 2074-03-15 0 0 0 0 100 0.3833
64 2075-03-15 0 0 0 0 100 0.3746
65 2076-03-15 0 0 0 0 100 0.366
66 2077-03-15 0 0 0 0 100 0.3577
67 2078-03-15 0 0 0 0 100 0.3496
68 2079-03-15 0 0 0 0 100 0.3416
69 2080-03-15 0 0 0 0 100 0.3338
70 2081-03-15 0 0 0 0 100 0.3262
71 2082-03-15 0 0 0 0 100 0.3188
72 2083-03-15 0 0 0 0 100 0.3115
73 2084-03-15 0 0 0 0 100 0.3044
74 2085-03-15 0 0 0 0 100 0.2975
75 2086-03-15 0 0 0 0 100 0.2907
76 2087-03-15 0 0 0 0 100 0.2841
77 2088-03-15 0 0 0 0 100 0.2776
78 2089-03-15 0 0 0 0 100 0.2713
79 2090-03-15 0 0 0 0 100 0.2651
80 2091-03-15 0 0 0 0 100 0.2591
81 2092-03-15 0 0 0 0 100 0.2532
82 2093-03-15 0 0 0 0 100 0.2474
83 2094-03-15 0 0 0 0 100 0.2418
84 2095-03-15 0 0 0 0 100 0.2363
85 2096-03-15 0 0 0 0 100 0.2309
86 2097-03-15 0 0 0 0 100 0.2257
87 2098-03-15 0 0 0 0 100 0.2205
88 2099-03-15 0 0 0 0 100 0.2155
89 2100-03-16 0 0 0 0 100 0.2106
90 2101-03-16 0 0 0 0 100 0.2058
91 2102-03-16 0 0 0 0 100 0.2011
92 2103-03-16 0 0 0 0 100 0.1965
93 2104-03-16 0 0 0 0 100 0.192
94 2105-03-16 0 0 0 0 100 0.1877
95 2106-03-16 0 0 0 0 100 0.1834
96 2107-03-16 0 0 0 0 100 0.1792
97 2108-03-16 0 0 0 0 100 0.1751
98 2109-03-16 0 0 0 0 100 0.1712
99 2110-03-16 0 0 0 0 100 0.1673
100 2111-03-16 0 0 0 0 100 0.1634

© 2017 Joe Honton