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4.74 SECTION 4<br />

TABLE 4.16<br />

Table of Nuclides (Continued)<br />

Element A Half-life<br />

Natural<br />

abundance,<br />

%<br />

Cross<br />

section,<br />

barns<br />

Radiation (MeV)<br />

Erbium (cont.) 171 7.52 h 370.(40) (1.49); Tm-x; (0.112,<br />

0.296, 0.308)<br />

172 2.05 d (0.28, 0.36); (0.407,<br />

0.610)<br />

Thullium 166 7.70 h (0.184, 0.779, 1.273,<br />

2.052)<br />

169 100 106<br />

170 128.6 d 100.(20) (0.968, 0.884)<br />

171 1.92 y 160 (0.096); (0.067)<br />

172 2.65 d (1.79, 1.86); (1.387,<br />

1.466, 1.530, 1.609)<br />

173 8.2 h (0.80, 0.86); (0.399,<br />

0.461)<br />

Ytterbium 165 9.9 min (1.58); (1.090)<br />

166 2.363 d (0.184, 0.779, 1.273,<br />

2.052)<br />

169 32.03 d 3.6(3) 10 3 (0.110, 0.177, 0.198)<br />

171 14.3(2) 50.(10)<br />

173 16.12(21) 16.(2)<br />

174 31.8(4) 120<br />

175 4.19 d (0.466); Lu-x;<br />

(0.396)<br />

176 12.7(2) 3.1(2)<br />

177 1.9 h (1.40); K, Lu-x;<br />

(0.150)<br />

178 1.23 h (0.25); (0.141, 0.325,<br />

0.352, 0.381, 0.613)<br />

Lutetium 164 3.14 min (1.6, 3.8); (0.124,<br />

0.262, 0.740, 0.864,<br />

0.880)<br />

165 16.7 min (2.06); (0.121, 0.132,<br />

0.174, 0.204)<br />

175 97.41(2) 24<br />

176m 3.66 h (1.229, 1.317); Hf-x;<br />

(0.0884)<br />

176 3.8 10 16 y 2100 (0.202, 0.307)<br />

177 6.75 d 10.(3) 10 2 (0.497), Hf-x; (0.113,<br />

0.208)<br />

Hafnium 178 27.297(4) 85<br />

179 13.629(6) 46<br />

†179m 1 18.7 s (0.161, 0.214)<br />

†179m 2 25.1 d (0.123, 0.146, 0.363,<br />

0.454)<br />

180 35.100(7) 13.(1)<br />

180m 5.519 h IT, Hf-x; (0.215, 0.332,<br />

0.443)<br />

181 42.4 d 30.(25) (0.408); Ta-x;<br />

(0.133, 0.346, 0.482)<br />

† Two different metastable states possessing the same mass number but different half-lives.

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