155 Ho
67 88
Half life: 48 m 1
Jp: 5/2+
Decay mode: e+b+
Sn (keV): 9485 25
Sp (keV): 2951 25
Prod. mode: Charged particle reaction
Literature cut-off date: 1-Mar-1994
Author(s): C.W. Reich
ENSDF citation: NDS 71,709 (1994)

Decay properties

Mode Branching (%) Q-value (keV)
e+b+ 100 3102 20

Gammas from 155Ho (48 m 1)

Eg (keV) Ig (%) Decay mode
9.1 1 0.00032 4 e+b+
22.15 5 0.000051 10 e+b+
22.15 5 0.0109 21 e+b+
37.80 4 1.34 25 e+b+
39.39 2 3.31 16 e+b+
45.38 5 5 3 e+b+
47.37 2 2.25 25 e+b+
49.52 5 0.075 15 e+b+
66.12 3 0.164 8 e+b+
74.33 3 0.041 4 e+b+
79.72 5 0.0300 25 e+b+
86.75 2 0.77 4 e+b+
88.26 5 0.021 5 e+b+
91.35 3 0.075 13 e+b+
92.22 6 0.038 13 e+b+
96.91 2 1.04 5 e+b+
100.84 6 0.047 16 e+b+
101.34 7 0.065 23 e+b+
102.16 3 0.064 8 e+b+
103.89 2 2.17 11 e+b+
108.79 2 0.463 25 e+b+
111.47 3 0.115 8 e+b+
115.3 1 e+b+
115.5 1 0.82 4 e+b+
123.10 6 0.025 e+b+
124.54 5 0.313 13 e+b+
136.30 2 5.00 25 e+b+
137.76 4 0.31 8 e+b+
138.46 4 0.88 9 e+b+
146.57 2 0.69 8 e+b+
147.63 6 0.052 8 e+b+
149.24 4 0.125 13 e+b+
150.09 6 0.050 13 e+b+
160.55 0.25 5 e+b+
160.76 4 0.94 19 e+b+
160.82 5 e+b+
161.08 8 0.25 5 e+b+
163.02 2 0.99 5 e+b+
185.13 2 2.25 13 e+b+
185.89 2 0.338 25 e+b+
189.09 2 0.250 25 e+b+
200.17 2 0.43 4 e+b+
200.86 7 1.52 6 e+b+
202.41 2 1.70 9 e+b+
206.08 8 0.19 e+b+
206.52 2 0.50 13 e+b+
208.41 2 1.61 8 e+b+
212.70 2 0.425 25 e+b+
215.03 2 0.262 13 e+b+
218.93 2 1.42 8 e+b+
224.55 2 0.15 5 e+b+
238.54 9 0.063 25 e+b+
240.19 2 12.5 6 e+b+
243.55 3 0.29 4 e+b+
247.77 2 1.55 8 e+b+
259.09 7 0.237 13 e+b+
262.23 3 1.13 13 e+b+
264.35 14 0.162 25 e+b+
266.4 1 <0.32 e+b+
272.22 2 0.71 13 e+b+
281.22 8 0.138 13 e+b+
286.02 2 0.63 4 e+b+
288.64 4 0.59 5 e+b+
304.02 2 0.387 25 e+b+
309.65 4 0.96 9 e+b+
309.65 4 0.96 9 e+b+
311.85 3 0.54 5 e+b+
321.31 6 0.68 4 e+b+
325.40 2 2.75 13 e+b+
336.02 3 0.46 5 e+b+
344.18 8 0.7 1 e+b+
348.99 3 0.70 4 e+b+
353.49 9 0.19 11 e+b+
369.10 10 0.56 11 e+b+
369.30 10 0.25 13 e+b+
373.26 4 0.40 4 e+b+
377.6 2 0.100 25 e+b+
382.88 14 0.56 6 e+b+
383.95 14 0.99 10 e+b+
391.15 10 0.162 25 e+b+
397.14 15 0.175 25 e+b+
408.58 2 1.24 6 e+b+
416.84 3 0.338 25 e+b+
420.97 3 0.70 4 e+b+
430.70 14 0.131 13 e+b+
439.71 3 0.525 25 e+b+
444.3 1 0.050 13 e+b+
448.98 3 0.74 4 e+b+
456.23 4 0.70 4 e+b+
460.73 5 0.60 4 e+b+
476.42 9 0.400 25 e+b+
478.2 2 <0.6 e+b+
479.13 4 <0.6 e+b+
493.3 3 0.138 14 e+b+
495.3 3 0.138 14 e+b+
502.9 3 0.13 6 e+b+
515.62 7 0.43 4 e+b+
518.43 15 0.15 6 e+b+
523.66 5 0.234 17 e+b+
529.4 3 0.087 25 e+b+
533.1 3 0.063 25 e+b+
536.6 1 0.095 10 e+b+
542.50 7 0.121 20 e+b+
554.0 2 e+b+
555.9 2 <0.35 e+b+
557.6 2 <0.35 e+b+
566.28 4 0.341 17 e+b+
569.2 2 0.29 10 e+b+
576.74 10 0.111 11 e+b+
599.22 15 0.10 4 e+b+
615.7 3 0.40 5 e+b+
616.2 4 0.10 4 e+b+
623.9 3 0.075 25 e+b+
648.45 8 0.124 16 e+b+
654.16 9 0.225 25 e+b+
659.6 2 0.162 25 e+b+
687.19 10 0.139 11 e+b+
689.07 11 0.122 16 e+b+
692.29 12 0.121 13 e+b+
699.50 15 0.153 13 e+b+
752.5 4 e+b+
765.85 7 0.228 14 e+b+
768.72 6 0.25 13 e+b+
791.75 8 0.144 13 e+b+
802.94 6 0.325 25 e+b+
825.5 3 0.200 25 e+b+
828.4 2 0.150 25 e+b+
834.85 9 0.21 5 e+b+
867.6 2 0.150 25 e+b+
872.42 12 0.125 25 e+b+
875.40 12 0.150 25 e+b+
892.2 2 0.54 6 e+b+
897.14 7 1.00 5 e+b+
902.03 11 0.325 25 e+b+
955.09 14 0.100 25 e+b+
994.10 7 0.75 6 e+b+
1010.8 3 0.162 25 e+b+
1015.35 6 0.60 5 e+b+
1027.9 2 0.14 5 e+b+
1033.47 4 1.06 5 e+b+
1057.2 2 0.162 25 e+b+
1081.40 6 0.69 6 e+b+
1178.39 4 0.563 25 e+b+
1218.0 3 0.147 17 e+b+
1259.21 9 0.150 25 e+b+
1270.95 14 0.138 25 e+b+
1327.48 7 0.200 15 e+b+
1332.63 12 0.114 15 e+b+
1371.9 4 0.124 11 e+b+
1398.0 6 0.087 25 e+b+
1471.1 3 0.070 14 e+b+
1476.5 5 0.075 25 e+b+
1504.8 4 0.075 25 e+b+
1516.6 3 0.063 25 e+b+
1530.2 2 0.125 25 e+b+
1535.9 2 0.138 25 e+b+
1540.0 2 0.150 25 e+b+
1613.6 2 0.21 4 e+b+
1672.5 3 0.087 25 e+b+
1679.4 4 0.063 25 e+b+
1693.6 2 0.087 25 e+b+
1696.0 3 0.075 25 e+b+
1700.7 2 0.125 25 e+b+
1708.3 5 0.10 4 e+b+
1883.0 15 0.14 5 e+b+
1935.3 3 0.14 4 e+b+
1939.7 2 0.162 25 e+b+
1943.0 3 0.100 25 e+b+
1972.8 3 0.138 25 e+b+
1994.7 2 0.112 25 e+b+
2018.9 2 0.21 5 e+b+
2045.0 2 0.081 19 e+b+
2063.5 2 0.162 25 e+b+
2069.2 1 0.26 6 e+b+
2113.2 2 0.150 25 e+b+
2128.6 2 0.14 4 e+b+
2150.3 2 0.225 25 e+b+
2167.8 2 0.125 25 e+b+
2170.7 2 0.150 25 e+b+
2182.1 2 0.075 25 e+b+
2184.6 2 0.063 25 e+b+
2192.1 2 0.175 25 e+b+
2200.9 1 0.225 25 e+b+
2207.3 2 0.150 25 e+b+
2218.5 3 0.075 25 e+b+
2222.1 4 0.087 25 e+b+
2241.3 1 0.438 25 e+b+

X-rays from 155Ho (48 m 1)

E (keV) I (%) Assignment
5,743 0.40 4 Dy Ll
6,458 1.03 8 Dy La2
6,495 9.3 7 Dy La1
6,534 0.149 12 Dy Lh
7,204 0.93 15 Dy Lb4
7,248 6.6 5 Dy Lb1
7,370 1.51 24 Dy Lb3
7,374 0.098 7 Dy Lb6
7,636 1.91 15 Dy Lb2
8,426 1.15 10 Dy Lg1
8,714 0.29 5 Dy Lg2
8,753 0.42 7 Dy Lg3
44,743 0.0087 3 Dy Ka3
45,208 23.3 7 Dy Ka2
45,998 41.7 12 Dy Ka1
51,947 4.27 12 Dy Kb3
52,113 8.25 24 Dy Kb1
52,475 0.143 6 Dy Kb5
53,476 2.76 8 Dy Kb2
53,634 0.95 4 Dy Kb4

Betas from 155Ho (48 m 1)

>Eb endpoint (keV) Ib (%) Decay mode
862,25 0.055 9 b+
1046,53 0.10 2 b+
1177,94 0.058 8 b+
1327,3 0.068 13 b+
1377,27 0.058 8 b+
1510,89 0.145 24 b+
1522,45 0.32 5 b+
1596,27 0.10 2 b+
1623,78 0.19 3 b+
1631,02 0.11 1 b+
1639,66 0.25 4 b+
1656,67 0.20 2 b+
1671,47 0.46 9 b+
1697,11 0.061 16 b+
1704,6 0.20 3 b+
1728,89 0.32 5 b+
1731 0.85 12 b+
1754,59 0.67 9 b+
1832,21 0.43 10 b+
1839,8 3.5 5 b+
1854,71 0.12 2 b+
1855,47 0.73 12 b+
1877,59 0.2 1 b+
1884,25 2.8 4 e
1943,68 1.1 2 b+
1993,23 2 b+
2040,62 3.8 10 b+
2068,53 2.7 4 e
2080 4 3 b+
2199,94 1.01 13 e
2349,3 0.79 15 e
2399,27 0.59 7 e
2532,89 1.10 18 e
2544,45 2.4 4 e
2618,27 0.67 10 e
2645,78 1.16 19 e
2653,02 0.66 9 e
2661,66 1.45 21 e
2678,67 1.1 1 e
2693,47 2.5 5 e
2719,11 0.32 8 e
2726,6 1.01 14 e
2750,89 1.6 2 e
2753 4.2 6 e
2776,59 3.1 4 e
2854,21 1.8 4 e
2861,8 13.9 18 e
2876,71 1.5 3 e
2877,47 2.9 5 e
2899,59 0.6 5 e
2965,68 3.8 7 e
3015,23 7 e
3062,62 11 3 e
3102 12 8 e