Isotopes of Tungsten

Natural tungsten contains five stable isotopes. Twenty one other unstable isotopes are recognized.

	Natural Abun. (%)	Atomic Mass	Half- life	Decay Mode /Energy (/MeV)	Part. En. /Intensity (MeV/%)	Cross-sect. Ther. Neut. (b)	Spin (h/2 pi)	Magnetic Dipl.Mom. (nm)	Electric Quad. Mom. (b)	Gamma En. /Intensity (MeV/%)
158W		157.97383	0.9ms	alpha
159W		158.97239	7ms	alpha
160W		159.94848	0.08s	alpha	5.92		0+
161W		160.94714	0.41s	ß+,E.C./ 8.4 alpha	5.78
162W		161.96329	1.39s	ß+,E.C./ 5.8 alpha	5.54		0+
163W		162.96227	2.8s	ß+,E.C./ 7.5 alpha	5.38
164W		163.95882	6s	ß+,E.C./ 4.9 alpha	5.15		0+			rad. an.
165W		164.95811	5.1s	ß+,E.C./ 6.8 alpha	4.91					rad. an.
166W		165.95502	16s	ß+,E.C./ 4.4 alpha	4.74		0+			rad. an.
167W		166.95454	20s	E.C./ 6.1
168W		167.95186	53s	E.C./ 3.7
169W		168.95175	1.3m	E.C./ 5.4
170W		169.94929	2.4m	E.C./ 3
171W		170.94946	2.4m	E.C./ 4.6
172W		171.94743	6.6m	ß+,E.C./ 2.5						0.0359 0.1302 0.4576 0.6236
173W		172.94771	6.3m	E.C./ 3.8						0.0499 0.1057 0.3652 0.707
174W		173.94616	35m	E.C./ 1.7			0+			0.0354 0.3287 0.4288
175W		174.94677	35m	E.C./ 2.9			1/2-			0.015 - 0.27
176W		175.94559	2.5h	ß+,E.C./ 0.8			0+			0.03358 0.06129 0.09487 0.1002
177W		176.94661	2.21h	E.C./ 2			1/2-			Ta k x rays 0.15505 0.18569 0.42694
178W		177.94584	21.6d	E.C./ 0.09			0+			Ta k x rays
179mW			6.4m	I.T./ 0.222 E.C.			1/2-			W k x rays 0.222
179W		178.947067	38m	E.C./ 1.06			7/2-			Ta k x rays 0.0307
180W	0.12 %	179.946701				4 b	0+
181W		180.948192	121.2d	E.C./ 0.19			9/2+			Ta k x rays 0.13617 0.15221
182W	26.3 %	181.948202				20 b	0+
183mW			5.15s	I.T.			11/2+			W k x rays 0.0465 0.0526 0.0991 0.1605
183W	14.28 %	182.95022				10.5 b	1/2-	0.11778 nm
184W	30.7 %	183.950928				2 b	0+
185mW			1.6m	I.T./ 0.1974			11/2+			W k x rays 0.0659 0.1315 0.1737
185W		184.953416	74.8d	ß-/ 0.433	0.433/ 99.9	3.3 b	3/2-			0.12536
186W	28.6 %	185.954357				36 b	0+
187W		186.957153	23.9h	ß-/ 1.312	0.624 1.315	70 b	3/2-	0.62 nm		Re k x rays 0.0725 0.47951 0.68572
188W		187.95848	69.4d	ß-/ 0.349	0.349/ 99		0+			0.0636 0.2271 0.2907
189W		188.9619	11.5m	ß-/ 2.5	1.4 2.5		3/2-			0.258 0.417 0.55
190W		189.96321	30m	ß-/ 1.3	0.95		0+			Re k x rays 0.1576 0.1621

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