Radioisotopes - Half Lives

Time for isotope radiation to be reduced by 50%. Comprehensive reference table of half-lives for various radioisotopes in seconds, minutes, hours, days, and years.

Radioisotope	Half Life (seconds)	Half Life (minutes)	Half Life (hours)	Half Life (days)	Half Life (years)
110Ag	24.6
241Am					432.2
243Am					7370
198Au				6.18
133Ba					10.53
140Ba				12.75
7Be				53.28
210Bi				5.01
82Br			35.304
14C					5715
45Ca				162.7
109Cd				462
144Ce				284.6
36Cl					301000
242Cm				162.8
244Cm					18.11
60Co					5271
51Cr				27.7
134Cs					2065
137Cs					30.3
64Cu			12.701
55Fe					2.73
59Fe				44.51
72Ga			14.1
68Ge				270.8
3H					12.32
203Hg				46.61
131I				8.04
115In					440×1012
192Ir				73.83
40K					1.26×109
42K			12.36
85Kr					10.73
140La			40.27
54Mn				312.2
99Mo				2.7476
22Na					2.605
24Na			14.96
63Ni					100
237Np					2.14×106
32P				14.28
210Pb					22.6
103Pd				16.99
109Pd			13.43
147Pm					2.6234
210Po				138.38
144Pr		17.28
232Pu		34
233Pu		20.9
234Pu			8.8
235Pu		25.3
236Pu					2.87
237Pu				45.2
238Pu					87.74
239Pu					24110
240Pu					6537
241Pu					14.4
242Pu					375000
243Pu			4.956
244Pu					82×106
245Pu			10.5
246Pu				10.85
86Rb				18.65
87Rb					48.8×109
102Rh					2.9
106Rh	29.9
106Ru					1.02
35S				87.2
243Sb					2.758
46Sc				83.81
85Se				119.78
32Si					160
113Sn				115.1
89Sr				50.52
90Sr					29.1
182Ta				114.43
99Tc					213000
123Te					13×1012
201Tl			72.912
170Tm				128.6
222U	1×10-6
225U	0.08
226U	0.5
227U		1.1
228U		9.1
229U		58
230U				20.8
231U				4.2
232U					68.9
233U					159000
234U					245000
235U					704×106
236U					23.4×106
237U				6.75
238U					4.46×109
239U		23.5
240U			14.1
242U		16.8
50V					140000×1012
90Y			2.67
65Zn				243.8
95Zr				64.02