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preface to fifteenth edition

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4.78 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 />

Astatine<br />

(cont.)<br />

209 5.41 h (5.65), K, Po-x;<br />

(0.545, 0.782, 0.790)<br />

210 8.1 h K, Po-x; (0.245, 0.528,<br />

1.181, 1.437, 1.483)<br />

211 7.214 h (5.87); K, Po-x;<br />

(0.669, 0.742)<br />

Radon 210 2.4 h (6.039); (0.196, 0.458,<br />

0.571, 0.649)<br />

211 14.68 h (5.784, 5.851); (0.169,<br />

0.250, 0.370, 0.674,<br />

0.678, 1.363)<br />

212 24 min (6.260)<br />

220 55.6 s (6.288)<br />

222 2.8235 d 0.74(5) (5.49); (0.510)<br />

Francium 212 20 min (6.41, 6.26); (1.186,<br />

1.275)<br />

220 27.4 s (6.686, 0.641, 6.582);<br />

(0.106, 0.154, 0.162)<br />

221 4.8 min (6.341); (0.218, 0.409)<br />

222 14.3 min (0.178)<br />

223 22.0 min (0.117)<br />

Radium *224 3.66 d 12.0(5) (5.685, 5.45); K, Rn-x;<br />

(0.241, 0.409, 0.650)<br />

*226 1599 y 13 (4.78, 4.60); K, Rn-x;<br />

(0.186, 0.262)<br />

*228 5.76 y 36.(5) (0.0135)<br />

Actinium *227 21.77 y 8.8(7) 10 2 (0.045); (4.95, 4.94);<br />

K, Th-x; (0.084,<br />

0.160, 0.270)<br />

*228 6.15 h (2.18, 1.85, 1.11); K,<br />

Th-x; (0.339, 0.911,<br />

0.969)<br />

Thorium 226 30.6 min (6.337, 6.228); (0.206,<br />

0.242)<br />

228 1.913 y 1.2(2) 10 2 (5.42, 5.34, 5.18); K,<br />

Ra-x<br />

*230 7.54 10 4 y 23.4(5) (4.68, 4.62); K, Ra-x;<br />

(0.068)<br />

231 1.063 d (0.305, 0.218, 0.138)<br />

*232 1.405 10 10 y 7.37(4) (4.01, 3.95); (0.059)<br />

233 22.3 min 1.5(1) 10 3 (1.245); (0.459)<br />

*234 24.10 d 1.8(5) (0.198, 0.102); K,<br />

Pa-x<br />

Protactinium 230 17.4 d 1.5(3) 10 3 (0.51); (0.444, 0.455,<br />

0.899, 0.952)<br />

*231 3.25 10 4 y 2.0(1) 10 2 (5.06, 5.03, 5.01, 4.95,<br />

4.73); K, Ac-x;<br />

(0.260, 0.284, 0.300,<br />

0.330)

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