157 Ho
67 90
Half life: 12.6 m 2
Jp: 7/2-
Decay mode: e+b+
Sn (keV): 9.49E3 sy
Sp (keV): 3647 50
Literature cut-off date: 1-Mar-1996
Author(s): R.G. Helmer
ENSDF citation: NDS 78,219 (1996)

Decay properties

Mode Branching (%) Q-value (keV)
e+b+ 100 2540 50

Gammas from 157Ho (12.6 m 2)

Eg (keV) Ig (%) Decay mode
14.23 5 1.07 16 e+b+
23.11 5 e+b+
26.07 4 e+b+
37.36 8 <0.23 e+b+
49.15 4 0.82 20 e+b+
51.7 1 e+b+
55.6 e+b+
61.11 2 5.3 5 e+b+
67.4 1 e+b+
71.1 1 0.036 9 e+b+
78.89 5 0.052 11 e+b+
86.55 2 5.8 6 e+b+
98.7 1 0.09 5 e+b+
106.48 4 0.91 9 e+b+
109.86 2 0.64 7 e+b+
121.0 1 0.30 7 e+b+
125.76 5 0.104 18 e+b+
126.95 4 0.30 5 e+b+
129.95 2 0.89 9 e+b+
131.9 1 0.091 23 e+b+
143.5 5 0.08 3 e+b+
147.73 1 2.04 20 e+b+
150.05 2 0.84 9 e+b+
153.09 1 3.1 3 e+b+
162.35 2 1.41 14 e+b+
163.9 2 0.36 5 e+b+
173.52 2 0.66 7 e+b+
188.05 4 4.2 4 e+b+
193.41 4 7.3 7 e+b+
196.41 4 0.66 7 e+b+
208.70 6 1.27 14 e+b+
210.5 5 0.079 23 e+b+
224.6 3 0.157 16 e+b+
227.4 2 0.28 3 e+b+
234.61 5 1.02 11 e+b+
251.5 5 0.16 7 e+b+
253.2 1 0.163 5 e+b+
257.88 5 1.14 11 e+b+
260.7 2 0.061 20 e+b+
267.0 4 0.5 3 e+b+
269.3 1 0.188 18 e+b+
272.17 8 4.3 4 e+b+
273.8 2 0.31 3 e+b+
279.97 1 22.7 11 e+b+
297.00 10 0.79 9 e+b+
320.2 1 1.8 5 e+b+
340.5 5 0.34 11 e+b+
341.16 6 17.5 17 e+b+
347.1 2 0.09 5 e+b+
353.80 10 0.218 23 e+b+
358.75 10 0.70 14 e+b+
360.54 10 0.59 7 e+b+
365.1 1 0.11 7 e+b+
367.2 1 0.32 7 e+b+
377.7 1 0.0068 23 e+b+
379.12 8 0.150 16 e+b+
388.4 1 0.45 5 e+b+
394.2 1 0.068 18 e+b+
395.6 3 0.066 16 e+b+
400.2 2 0.186 18 e+b+
401.6 3 0.045 14 e+b+
405.9 2 0.077 11 e+b+
416.5 2 0.050 16 e+b+
420.0 1 0.28 3 e+b+
428.2 2 0.17 3 e+b+
430.3 2 0.15 4 e+b+
447.3 5 0.09 5 e+b+
449.6 2 0.22 3 e+b+
463.3 1 0.32 3 e+b+
466.0 1 0.168 23 e+b+
468.0 1 0.152 23 e+b+
476.7 1 0.55 5 e+b+
508.3 2 3.0 3 e+b+
522.8 1 0.134 20 e+b+
527.4 6 0.045 e+b+
540.5 2 0.118 20 e+b+
550.1 2 0.19 6 e+b+
555.5 2 3.0 3 e+b+
567.7 2 0.17 3 e+b+
570.2 1 0.59 11 e+b+
582.2 1 0.10 4 e+b+
597.5 3 0.14 7 e+b+
600.4 5 0.13 3 e+b+
610.2 2 0.15 6 e+b+
626.8 3 0.18 5 e+b+
628.2 5 0.18 e+b+
648.8 4 0.32 7 e+b+
661.9 1 0.32 5 e+b+
685.4 2 0.82 11 e+b+
688.1 2 0.48 7 e+b+
703.0 2 0.19 3 e+b+
708.6 1 1.36 14 e+b+
749.0 2 0.20 7 e+b+
779.0 2 0.46 5 e+b+
791.0 2 0.25 5 e+b+
801.7 4 0.048 16 e+b+
828.1 2 0.59 7 e+b+
835.30 10 1.07 11 e+b+
842.4 3 0.25 7 e+b+
870.1 1 0.89 9 e+b+
896.6 1 4.0 4 e+b+
928.9 1 0.59 7 e+b+
936.4 3 0.159 23 e+b+
946.2 2 0.195 20 e+b+
954.9 2 0.086 18 e+b+
963.0 2 0.120 23 e+b+
969.0 2 0.084 16 e+b+
1037.2 2 0.129 23 e+b+
1039.0 4 0.09 3 e+b+
1043.8 3 0.05 3 e+b+
1053.7 3 0.084 16 e+b+
1063.3 3 0.127 23 e+b+
1072.6 4 0.059 25 e+b+
1082.1 3 0.111 23 e+b+
1090.2 3 0.059 14 e+b+
1150.0 1 0.82 9 e+b+
1158.8 2 0.059 23 e+b+
1169.9 3 0.22 6 e+b+
1172.2 2 0.089 25 e+b+
1191.9 2 0.15 3 e+b+
1202.1 2 0.073 14 e+b+
1211.1 1 2.34 23 e+b+
1232.6 4 0.079 23 e+b+
1239.7 2 0.064 14 e+b+
1274.8 3 0.14 3 e+b+
1298.3 2 0.089 18 e+b+
1302.9 2 0.13 3 e+b+
1319.0 3 0.18 3 e+b+
1332.5 2 0.054 11 e+b+
1349.8 3 0.11 3 e+b+
1358.9 2 0.073 23 e+b+
1380.2 2 0.32 7 e+b+
1395.0 2 0.041 9 e+b+
1406.5 2 0.15 5 e+b+
1460.2 2 0.32 7 e+b+
1490.9 2 0.043 e+b+
1510.4 2 0.05 e+b+
1521.9 2 0.039 e+b+
1563.7 2 0.07 e+b+
1763.7 5 0.050 25 e+b+
1788.6 2 0.08 3 e+b+

X-rays from 157Ho (12.6 m 2)

E (keV) I (%) Assignment
5,743 0.56 6 Dy Ll
6,458 1.45 11 Dy La2
6,495 13.1 10 Dy La1
6,534 0.193 17 Dy Lh
7,204 0.79 12 Dy Lb4
7,248 8.6 8 Dy Lb1
7,370 1.28 20 Dy Lb3
7,374 0.137 11 Dy Lb6
7,636 2.69 22 Dy Lb2
8,426 1.50 13 Dy Lg1
8,714 0.25 4 Dy Lg2
8,753 0.36 6 Dy Lg3
44,743 0.0154 8 Dy Ka3
45,208 41.2 20 Dy Ka2
45,998 73 4 Dy Ka1
51,947 7.5 4 Dy Kb3
52,113 14.6 7 Dy Kb1
52,475 0.252 15 Dy Kb5
53,476 4.86 23 Dy Kb2
53,634 1.68 10 Dy Kb4

Betas from 157Ho (12.6 m 2)

>Eb endpoint (keV) Ib (%) Decay mode
306,87 0.0014 13 b+
527,88 0.009 4 b+
621,43 0.063 24 b+
991,1 0.038 10 b+
1009,78 0.19 5 b+
1098,07 0.32 7 b+
1159,76 1.0 2 e
1176,88 2.8 6 b+
1328,87 4.4 7 e
1356,01 0.48 21 b+
1456,86 0.7 b+
1549,88 3.0 5 e
1643,43 11 2 e
2013,1 1.21 22 e
2031,78 5.6 10 e
2120,07 7.2 11 e
2198,88 49 8 e
2378,01 5.2 22 e
2478,86 6 e