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B | Selected Radioactive Isotopes

Resource ID: VrcwM_2t@5
Grade Range: PreK - 12

B | Selected Radioactive Isotopes

B | Selected Radioactive Isotopes

Decay modes are αα size 12{α} {}, β−β− size 12{β rSup { size 8{ - {}} } } {}, β+β+ size 12{β rSup { size 8{+{}} } } {}, electron capture (EC) and isomeric transition (IT). EC results in the same daughter nucleus as would β+β+ size 12{β rSup { size 8{+{}} } } {} decay. IT is a transition from a metastable excited state. Energies for β±β± size 12{β rSup { size 8{ +- {}} } } {} decays are the maxima; average energies are roughly one-half the maxima.

Isotope t 1/2 DecayMode(s) Energy(MeV) Percent γγ size 12{γ} {}-Ray Energy(MeV) Percent
3H3H size 12{rSup { size 8{ 3 {}} }H} {} 12.33 y β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 0.0186 100%
14C14C size 12{rSup { size 8{ 6 {}} }Li} {} 5730 y β−β− size 12{β rSup { size 8{ - {}} } } {} 0.156 100%
13N13N size 12{rSup { size 8{ 13 {}} }N} {} 9.96 min β+β+ size 12{β rSup { size 8{+{}} } } {} 1.20 100%
22Na22Na size 12{rSup { size 8{ 6 {}} }Li} {} 2.602 y β+β+ size 12{β rSup { size 8{+{}} } } {} 0.55 90% γγ size 12{γ} {} 1.27 100%
32P32P size 12{rSup { size 8{ 32 {}} }P} {} 14.28 d β−β− size 12{β rSup { size 8{ - {}} } } {} 1.71 100%
35S35S size 12{rSup { size 8{ 35 {}} }S} {} 87.4 d β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 0.167 100%
36Cl36Cl size 12{rSup { size 8{ 36 {}} }Cl} {} 3.00×105y3.00×105y size 12{3 "." "00" times "10" rSup { size 8{5} } y} {} β−β− size 12{β rSup { size 8{ - {}} } } {} 0.710 100%
40K40K size 12{rSup { size 8{ 40 {}} }K} {} 1.28×109y1.28×109y size 12{1 "." "28" times "10" rSup { size 8{9} } y} {} β−β− size 12{β rSup { size 8{ - {}} } } {} 1.31 89%
43K43K size 12{rSup { size 8{ 43 {}} }K} {} 22.3 h β−β− size 12{β rSup { size 8{ - {}} } } {} 0.827 87% γsγs size 12{γs} {} 0.373 87%
0.618 87%
45Ca45Ca size 12{rSup { size 8{ 6 {}} }Li} {} 165 d β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 0.257 100%
51Cr51Cr size 12{rSup { size 8{ 51 {}} }Cr} {} 27.70 d EC γγ size 12{γ} {} 0.320 10%
52Mn52Mn size 12{rSup { size 8{ 52 {}} }Mn} {} 5.59d β+β+ size 12{β rSup { size 8{+{}} } } {} 3.69 28% γsγs size 12{γs} {} 1.33 28%
1.43 28%
52Fe52Fe size 12{rSup { size 8{ 52 {}} }Fe} {} 8.27 h β+β+ size 12{β rSup { size 8{+{}} } } {} 1.80 43% 0.169 43%
0.378 43%
59Fe59Fe size 12{rSup { size 8{ 59 {}} }Fe} {} 44.6 d β−sβ−s size 12{β rSup { size 8{ - {}} } s} {} 0.273 45% γsγs size 12{γs} {} 1.10 57%
0.466 55% 1.29 43%
60Co60Co size 12{rSup { size 8{ 60 {}} }Co} {} 5.271 y β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 0.318 100% γsγs size 12{γs} {} 1.17 100%
1.33 100%
65Zn65Zn size 12{rSup { size 8{ 65 {}} }Zn} {} 244.1 d EC γγ size 12{γ} {} 1.12 51%
67Ga67Ga size 12{rSup { size 8{ 67 {}} }Ga} {} 78.3 h EC γsγs size 12{γs} {} 0.0933 70%
0.185 35%
0.300 19%
others
75Se75Se size 12{rSup { size 8{ 75 {}} }Se} {} 118.5 d EC γsγs size 12{γs} {} 0.121 20%
0.136 65%
0.265 68%
0.280 20%
others
86Rb86Rb size 12{rSup { size 8{ 86 {}} }Rb} {} 18.8 d β−sβ−s size 12{β rSup { size 8{ - {}} } s} {} 0.69 9% γγ size 12{γ} {} 1.08 9%
1.77 91%
85Sr85Sr size 12{rSup { size 8{ 85 {}} }Sr} {} 64.8 d EC γγ size 12{γ} {} 0.514 100%
90Sr90Sr size 12{rSup { size 8{ 90 {}} }Sr} {} 28.8 y β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 0.546 100%
90Y90Y size 12{rSup { size 8{ 90 {}} }Y} {} 64.1 h β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 2.28 100%
99mTc99mTc size 12{rSup { size 8{ 99m {}} }Tc} {} 6.02 h IT γγ size 12{γ} {} 0.142 100%
113mIn113mIn size 12{rSup { size 8{ 113m {}} }In} {} 99.5 min IT γγ size 12{γ} {} 0.392 100%
123I123I size 12{rSup { size 8{ 123 {}} }I} {} 13.0 h EC γγ size 12{γ} {} 0.159 ≈100%≈100% size 12{ approx "100"%} {}
131I131I size 12{rSup { size 8{ 131 {}} }I} {} 8.040 d β−sβ−s size 12{β rSup { size 8{ - {}} } s} {} 0.248 7% γsγs size 12{γs} {} 0.364 85%
0.607 93% others
others
129Cs129Cs size 12{rSup { size 8{ 129 {}} }Cs} {} 32.3 h EC γsγs size 12{γs} {} 0.0400 35%
0.372 32%
0.411 25%
others
137Cs137Cs size 12{rSup { size 8{ 137 {}} }Cs} {} 30.17 y β−sβ−s size 12{β rSup { size 8{ - {}} } s} {} ­ 0.511 95% γγ size 12{γ} {} 0.662 95%
1.17 5%
140Ba140Ba size 12{rSup { size 8{ 140 {}} }Ba} {} 12.79 d β−β− size 12{β rSup { size 8{ - {}} } } {} 1.035 ≈100%≈100% size 12{ approx "100"%} {} γsγs size 12{γs} {} 0.030 25%
0.044 65%
0.537 24%
others
198Au198Au size 12{rSup { size 8{ 198 {}} }Au} {} 2.696 d β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 1.161 ≈100%≈100% size 12{ approx "100"%} {} γγ size 12{γ} {} 0.412 ≈100%≈100% size 12{ approx "100"%} {}
197Hg197Hg size 12{rSup { size 8{ 197 {}} }Hg} {} 64.1 h EC γγ size 12{γ} {} 0.0733 100%
210Po210Po size 12{rSup { size 8{ 210 {}} }Po} {} 138.38 d αα size 12{α} {} 5.41 100%
226Ra226Ra size 12{rSup { size 8{ 226 {}} }Ra} {} 1.60×103y1.60×103y size 12{1 "." "60" times "10" rSup { size 8{3} } y} {} αsαs size 12{αs} {} 4.68 5% γγ size 12{γ} {} 0.186 100%
4.87 95%
235U235U size 12{rSup { size 8{ 6 {}} }Li} {} 7.038×108y7.038×108y size 12{7 "." "038" times "10" rSup { size 8{8} } y} {} αα size 12{α} {} 4.68 ≈100%≈100% size 12{ approx "100"%} {} γsγs size 12{γs} {} numerous <0.400%
238U238U size 12{rSup { size 8{ 6 {}} }Li} {} 4.468×109y4.468×109y size 12{4 "." "468" times "10" rSup { size 8{9} } y} {} αsαs size 12{αs} {} 4.22 23% γγ size 12{γ} {} 0.050 23%
4.27 77%
237Np237Np size 12{rSup { size 8{ 237 {}} }Np} {} 2.14×106y2.14×106y size 12{2 "." "14" times "10" rSup { size 8{6} } y} {} αsαs size 12{αs} {} numerous γsγs size 12{γs} {} numerous <0.250%
4.96 (max.)
239Pu239Pu size 12{rSup { size 8{ 239 {}} }Pu} {} 2.41×104y2.41×104y size 12{2 "." "41" times "10" rSup { size 8{4} } y} {} αsαs size 12{αs} {} 5.19 11% γsγs size 12{γs} {} 7.5×10−57.5×10−5 size 12{7 "." 5 times "10" rSup { size 8{ - 5} } } {} 73%
5.23 15% 0.013 15%
5.24 73% 0.052 10%
others
243Am243Am size 12{rSup { size 8{ 243 {}} }Am} {} 7.37×103y7.37×103y size 12{7 "." "37" times "10" rSup { size 8{3} } y} {} αsαs size 12{αs} {} Max. 5.44 γsγs size 12{γs} {} 0.075
5.37 88% others
5.32 11%
others
Table B1

Selected Radioactive Isotopes

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