Tungsten-171

Properties and data of the isotope ¹⁷¹W.

Content

General data

Name of the isotope:Tungsten-171; W-171Symbol:¹⁷¹W or 17174WMass number A:171 (= number of nucleons)Atomic number Z:74 (= number of protons)Neutrons N:97Isotopic mass:170.94945(3) u (atomic weight of Tungsten-171)Nuclide mass:170.9088591 u (calculated nuclear mass without electrons)Mass excess:-47.08702 MeVMass defect:1.47009922 u (per nucleus)Nuclear binding energy:1369.38860283 MeV (per nucleus)
8.00812048 MeV (average binding energy per nucleon)Separation energy:S_N = 7.87(3) MeV (first neutron)
S_P = 4.24(4) MeV (first proton)Half-life:2.38(4) minDecay constant λ:0.0048539718526607 s^-1Specific activity α:1.719488366287 × 10⁺¹⁹ Bq g^-1
464726585.48316 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Year of discovery:1983

Radioactive Decay

Half-life T_½ = 2.38(4) min (minutes) respectively 1.428 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁷¹Ta	100 %	4.63(4) MeV

Parent Nuclides

Direct parent isotope is: ¹⁷¹Re.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 171) with Tungsten-171. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 97	Isobar A = 171
56	¹⁵³Ba
57	¹⁵⁴La
58	¹⁵⁵Ce
59	¹⁵⁶Pr
60	¹⁵⁷Nd
61	¹⁵⁸Pm
62	¹⁵⁹Sm
63	¹⁶⁰Eu
64	¹⁶¹Gd
65	¹⁶²Tb	¹⁷¹Tb
66	¹⁶³Dy	¹⁷¹Dy
67	¹⁶⁴Ho	¹⁷¹Ho
68	¹⁶⁵Er	¹⁷¹Er
69	¹⁶⁶Tm	¹⁷¹Tm
70	¹⁶⁷Yb	¹⁷¹Yb
71	¹⁶⁸Lu	¹⁷¹Lu
72	¹⁶⁹Hf	¹⁷¹Hf
73	¹⁷⁰Ta	¹⁷¹Ta
74	¹⁷¹W	¹⁷¹W
75	¹⁷²Re	¹⁷¹Re
76	¹⁷³Os	¹⁷¹Os
77	¹⁷⁴Ir	¹⁷¹Ir
78	¹⁷⁵Pt	¹⁷¹Pt
79	¹⁷⁶Au	¹⁷¹Au
80	¹⁷⁷Hg	¹⁷¹Hg
81	¹⁷⁸Tl
82	¹⁷⁹Pb