155 Dy
66 89
Half life: 9.9 h 2
Jp: 3/2-
Decay mode: e+b+
Sn (keV): 6835 14
Sp (keV): 6299 51
Prod. mode: Charged particle reaction
Fast neutron activation
Literature cut-off date: 1-Mar-1994
Author(s): C.W. Reich
Update: 20-Sep-1996, B. Singh
ENSDF citation: NDS 71,709 (1994)

Decay properties

Mode Branching (%) Q-value (keV)
e+b+ 100 2094.5 19

Gammas from 155Dy (9.9 h 2)

Eg (keV) Ig (%) Decay mode
21.005 5 0.014 6 e+b+
23.132 29 0.026 7 e+b+
23.96 5 e+b+
42.964 18 0.082 14 e+b+
63.781 15 0.018 3 e+b+
65.459 3 1.83 3 e+b+
67.029 10 0.040 3 e+b+
68.855 23 0.012 6 e+b+
71.157 10 0.044 3 e+b+
84.83 4 0.022 6 e+b+
90.326 2 1.067 21 e+b+
107.925 15 0.048 3 e+b+
115.268 7 0.097 6 e+b+
118.304 10 0.096 6 e+b+
121.083 12 e+b+
131.946 11 0.021 6 e+b+
134.552 14 0.013 4 e+b+
135.454 13 e+b+
153.37 3 0.046 7 e+b+
155.765 9 0.207 8 e+b+
161.3 0.073 5 e+b+
161.443 4 1.149 21 e+b+
178.93 5 0.019 6 e+b+
184.564 4 3.37 6 e+b+
195.68 4 0.021 6 e+b+
205.583 9 0.356 14 e+b+
208.583 14 0.0246 21 e+b+
216.85 4 0.13 3 e+b+
226.918 4 68.4 12 e+b+
248.645 22 0.107 5 e+b+
264.621 18 0.14 3 e+b+
269.358 24 0.172 7 e+b+
271.056 9 1.21 7 e+b+
276.81 5 0.038 14 e+b+
289.81 4 0.022 8 e+b+
294.89 5 0.048 3 e+b+
311.18 16 0.033 3 e+b+
317.947 18 0.208 8 e+b+
322.27 4 0.027 3 e+b+
334.963 19 0.122 4 e+b+
342.67 6 0.048 4 e+b+
352.47 11 0.014 3 e+b+
356.87 10 0.014 3 e+b+
377.72 5 0.049 3 e+b+
379.3 e+b+
382.772 20 0.181 6 e+b+
394.54 8 0.028 10 e+b+
401.96 11 0.035 4 e+b+
403.57 4 0.208 10 e+b+
408.80 10 0.0096 21 e+b+
421.85 5 0.043 3 e+b+
425.03 3 0.061 3 e+b+
433.150 13 0.711 21 e+b+
439.56 6 0.046 3 e+b+
441.44 7 0.040 3 e+b+
445.84 8 0.022 3 e+b+
452.248 24 0.160 6 e+b+
459.05 3 0.109 10 e+b+
462.06 8 0.036 5 e+b+
463.0 e+b+
466.95 6 0.019 6 e+b+
484.158 13 1.07 3 e+b+
496.22 4 0.144 6 e+b+
498.617 15 1.75 4 e+b+
508.44 4 1.19 5 e+b+
517.62 5 0.076 12 e+b+
533.12 14 0.021 3 e+b+
534.0 3 0.021 10 e+b+
537.1 3 0.008 3 e+b+
542.24 3 0.059 6 e+b+
549.643 14 0.958 21 e+b+
559.44 8 0.032 5 e+b+
570.449 20 0.191 6 e+b+
576.82 11 e+b+
586.44 3 0.163 6 e+b+
588.16 8 0.052 3 e+b+
596.22 12 0.042 6 e+b+
599.14 22 0.023 6 e+b+
602.95 10 0.024 4 e+b+
609.94 4 0.079 4 e+b+
610.62 12 e+b+
614.83 13 0.029 4 e+b+
618.59 4 0.100 6 e+b+
632.4 10 0.014 3 e+b+
641.072 15 1.25 3 e+b+
653.92 6 0.120 8 e+b+
656.69 6 0.131 10 e+b+
661.62 22 0.055 12 e+b+
664.173 18 2.24 6 e+b+
666.4 4 0.055 17 e+b+
669.02 20 0.065 19 e+b+
676.39 12 0.040 4 e+b+
678.38 5 0.199 11 e+b+
688.4 7 0.008 6 e+b+
695.138 22 0.211 13 e+b+
701.15 9 0.057 6 e+b+
705.87 22 0.021 6 e+b+
712.49 7 0.046 4 e+b+
721.19 4 0.284 9 e+b+
723.46 8 0.100 6 e+b+
725.24 4 0.194 7 e+b+
739.12 12 0.010 3 e+b+
743.64 5 ~0 e+b+
743.9 0.14 3 e+b+
745.2 0.34 7 e+b+
750.07 7 0.085 6 e+b+
758.99 20 0.047 8 e+b+
760.70 12 0.088 11 e+b+
765.4 <0.037 e+b+
767.6 1 <0.037 e+b+
773.57 5 0.101 8 e+b+
782.19 4 0.104 7 e+b+
784.61 6 0.084 5 e+b+
796.44 7 0.057 6 e+b+
802.87 6 0.0171 21 e+b+
808.28 12 0.094 12 e+b+
811.98 4 0.404 21 e+b+
820.40 12 0.032 5 e+b+
825.60 4 0.130 8 e+b+
835.16 3 0.253 9 e+b+
838.48 5 0.129 7 e+b+
841.53 3 0.279 10 e+b+
845.78 7 0.048 5 e+b+
848.98 3 0.178 10 e+b+
854.78 8 0.051 4 e+b+
861.74 23 0.042 10 e+b+
871.90 8 0.030 4 e+b+
875.30 12 0.025 3 e+b+
878.23 8 0.040 3 e+b+
884.42 5 0.060 5 e+b+
891.13 3 0.588 21 e+b+
905.515 21 2.45 6 e+b+
912.47 6 0.219 21 e+b+
920.94 4 0.108 6 e+b+
925.4 4 0.014 5 e+b+
928.535 21 0.718 21 e+b+
938.19 4 0.118 4 e+b+
940.516 25 0.304 9 e+b+
944.24 11 0.034 4 e+b+
949.99 8 0.055 6 e+b+
962.44 7 0.060 7 e+b+
972.36 4 0.081 8 e+b+
978.87 10 0.040 3 e+b+
981.82 3 0.210 7 e+b+
994.18 14 0.057 8 e+b+
996.70 7 0.271 16 e+b+
999.68 3 2.44 7 e+b+
1003.03 10 0.163 14 e+b+
1009.96 10 0.029 3 e+b+
1012.89 4 0.298 14 e+b+
1024.00 18 0.027 6 e+b+
1050.0 3 0.017 7 e+b+
1062.09 3 0.386 12 e+b+
1068.18 3 0.575 21 e+b+
1089.8 <2.8 e+b+
1090.0 <2.8 e+b+
1093.70 10 0.036 3 e+b+
1098.2 <0.22 e+b+
1100.1 <0.22 e+b+
1115.2 <0.41 e+b+
1117.0 <0.41 e+b+
1120.11 5 0.075 10 e+b+
1143.44 8 0.054 5 e+b+
1155.47 3 2.09 5 e+b+
1166.22 3 1.692 16 e+b+
1172.59 12 0.049 8 e+b+
1184.05 10 0.024 3 e+b+
1198.14 9 0.029 3 e+b+
1201.87 8 0.036 3 e+b+
1213.1 5 0.033 16 e+b+
1221.52 6 0.060 14 e+b+
1232.34 12 0.045 6 e+b+
1242.63 4 0.0882 12 e+b+
1251.24 3 0.945 4 e+b+
1265.69 16 0.015 4 e+b+
1283.32 14 0.0227 9 e+b+
1289.08 25 0.010 6 e+b+
1295.00 4 0.179 3 e+b+
1304.05 4 0.174 5 e+b+
1316.28 4 0.157 5 e+b+
1329.85 11 0.020 3 e+b+
1336.83 3 0.490 15 e+b+
1348.39 7 0.062 5 e+b+
1356.85 10 0.025 6 e+b+
1367.77 3 0.801 14 e+b+
1386.37 6 0.1057 16 e+b+
1388.82 6 0.1012 21 e+b+
1393.83 4 0.2627 21 e+b+
1402.0 4 0.011 3 e+b+
1404.5 3 0.014 3 e+b+
1412.08 7 0.071 3 e+b+
1414.93 4 0.248 8 e+b+
1427.19 3 0.413 6 e+b+
1429.50 10 0.022 3 e+b+
1437.97 4 0.285 3 e+b+
1451.83 4 0.164 3 e+b+
1459.00 23 0.031 5 e+b+
1479.22 4 0.5424 21 e+b+
1492.61 4 0.5718 21 e+b+
1509.27 4 0.250 8 e+b+
1522.51 9 0.031 3 e+b+
1543.78 9 0.0105 12 e+b+
1548.73 16 0.0054 10 e+b+
1557.8 4 0.0062 21 e+b+
1562.91 6 0.083 4 e+b+
1567.04 10 0.020 3 e+b+
1573.56 5 0.098 4 e+b+
1577.90 10 0.0075 14 e+b+
1590.04 9 0.0280 21 e+b+
1594.52 6 0.055 3 e+b+
1599.57 4 0.265 7 e+b+
1606.4 3 0.6231 14 e+b+
1609.14 14 0.0178 21 e+b+
1610.52 22 0.0037 12 e+b+
1637.87 5 0.082 3 e+b+
1641.9 3 0.0072 12 e+b+
1647.82 17 0.0103 15 e+b+
1656.05 24 0.026 5 e+b+
1664.98 6 0.87 3 e+b+
1678.1 5 0.007 3 e+b+
1684.80 5 0.111 4 e+b+
1691.6 4 0.010 8 e+b+
1710.08 11 0.0129 10 e+b+
1713.09 9 0.0177 12 e+b+
1728.02 7 0.0410 21 e+b+
1745.60 12 0.0118 13 e+b+
1750.45 6 0.0288 13 e+b+
1758.10 10 0.0025 3 e+b+
1764.86 9 0.007 3 e+b+
1769.60 20 0.0021 3 e+b+
1793.64 6 0.048 3 e+b+
1795.30 10 0.0144 14 e+b+
1803.60 8 0.0144 10 e+b+
1835.55 15 0.0098 10 e+b+
1846.2 3 0.0040 12 e+b+
1866.17 25 0.0121 17 e+b+
1869.00 10 0.00041 7 e+b+
1889.22 8 0.0217 16 e+b+
1913.60 10 0.00048 7 e+b+
1954.76 11 0.0139 14 e+b+

X-rays from 155Dy (9.9 h 2)

E (keV) I (%) Assignment
5,547 0.32 3 Tb Ll
6,239 0.84 5 Tb La2
6,273 7.6 5 Tb La1
6,284 0.112 9 Tb Lh
6,940 0.46 7 Tb Lb4
6,977 4.9 4 Tb Lb1
7,097 0.76 12 Tb Lb3
7,116 0.078 5 Tb Lb6
7,367 1.57 11 Tb Lb2
8,105 0.84 7 Tb Lg1
8,398 0.147 24 Tb Lg2
8,423 0.21 3 Tb Lg3
43,288 0.0095 3 Tb Ka3
43,744 27.8 8 Tb Ka2
44,482 49.8 14 Tb Ka1
50,228 5.02 14 Tb Kb3
50,384 9.7 3 Tb Kb1
50,738 0.160 7 Tb Kb5
51,698 3.23 9 Tb Kb2
51,849 1.20 5 Tb Kb4

Betas from 155Dy (9.9 h 2)

>Eb endpoint (keV) Ib (%) Decay mode
102,72 0.047 6 e
139,78 0.096 11 e
180,9 0.105 6 e
183,3 0.123 11 e
225,55 0.099 8 e
228,68 0.387 21 e
233,55 0.042 3 e
258,68 0.115 6 e
300,85 0.482 15 e
344,4 2.29 4 e
429,59 4.88 9 e
438,11 0.267 22 e
455,65 4.33 7 e
554,96 0.00044 8 b+
564,1 0.0044 3 b+
601,86 1.60 4 e
623,51 0.093 9 e
642,5 0.602 15 e
799,54 0.79 8 e
845,58 1.27 4 b+
939,02 10.77 19 e
974,5 0.288 17 e
1007,04 0.039 7 b+
1026,13 0.55 3 e
1032,43 1.27 4 e
1072,5 0.065 18 b+
1144,12 0.100 7 e
1188,07 0.015 9 e
1203,36 4.08 9 e
1232,63 0.121 14 e
1333,87 0.234 21 e
1350,58 0.05 4 e
1576,96 0.109 18 e
1586,1 1.02 6 e
1627,7 0.16 4 e
1867,58 64.9 17 e
2029,04 1.06 20 e
2094,5 1.4 4 e