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Selected Radioactive Isotopes

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Decay modes are αα size 12{α} {}, ββ 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.

Table 1: Selected Radioactive Isotopes
Isotope t 1/2 DecayMode(s) Energy(MeV) Percent   γγ size 12{γ} {}-Ray Energy(MeV) Percent
3 H 3 H size 12{rSup { size 8{ 3 {}} }H} {} 12.33 y ββ size 12{β rSup { size 8{ - {}} } } {} ­ 0.0186 100%      
14 C 14 C size 12{rSup { size 8{ 6 {}} }Li} {} 5730 y β β size 12{β rSup { size 8{ - {}} } } {} 0.156 100%      
13 N 13 N size 12{rSup { size 8{ 13 {}} }N} {} 9.96 min β + β + size 12{β rSup { size 8{+{}} } } {} 1.20 100%      
22 Na 22 Na size 12{rSup { size 8{ 6 {}} }Li} {} 2.602 y β + β + size 12{β rSup { size 8{+{}} } } {} 0.55 90% γ γ size 12{γ} {} 1.27 100%
32 P 32 P size 12{rSup { size 8{ 32 {}} }P} {} 14.28 d β β size 12{β rSup { size 8{ - {}} } } {} 1.71 100%      
35 S 35 S size 12{rSup { size 8{ 35 {}} }S} {} 87.4 d ββ size 12{β rSup { size 8{ - {}} } } {} ­ 0.167 100%      
36 Cl 36 Cl size 12{rSup { size 8{ 36 {}} }Cl} {} 3 . 00 × 10 5 y 3 . 00 × 10 5 y size 12{3 "." "00" times "10" rSup { size 8{5} } y} {} β β size 12{β rSup { size 8{ - {}} } } {} 0.710 100%      
40 K 40 K size 12{rSup { size 8{ 40 {}} }K} {} 1 . 28 × 10 9 y 1 . 28 × 10 9 y size 12{1 "." "28" times "10" rSup { size 8{9} } y} {} β β size 12{β rSup { size 8{ - {}} } } {} 1.31 89%      
43 K 43 K size 12{rSup { size 8{ 43 {}} }K} {} 22.3 h β β size 12{β rSup { size 8{ - {}} } } {} 0.827 87% γ s γ s size 12{γs} {} 0.373 87%
            0.618 87%
45 Ca 45 Ca size 12{rSup { size 8{ 6 {}} }Li} {} 165 d ββ size 12{β rSup { size 8{ - {}} } } {} ­ 0.257 100%      
51 Cr 51 Cr size 12{rSup { size 8{ 51 {}} }Cr} {} 27.70 d EC     γ γ size 12{γ} {} 0.320 10%
52 Mn 52 Mn size 12{rSup { size 8{ 52 {}} }Mn} {} 5.59d β + β + size 12{β rSup { size 8{+{}} } } {} 3.69 28% γ s γ s size 12{γs} {} 1.33 28%
            1.43 28%
52 Fe 52 Fe 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%
59 Fe 59 Fe size 12{rSup { size 8{ 59 {}} }Fe} {} 44.6 d β s β s size 12{β rSup { size 8{ - {}} } s} {} 0.273 45% γ s γ s size 12{γs} {} 1.10 57%
      0.466 55%   1.29 43%
60 Co 60 Co size 12{rSup { size 8{ 60 {}} }Co} {} 5.271 y ββ size 12{β rSup { size 8{ - {}} } } {} ­ 0.318 100% γ s γ s size 12{γs} {} 1.17 100%
            1.33 100%
65 Zn 65 Zn size 12{rSup { size 8{ 65 {}} }Zn} {} 244.1 d EC     γ γ size 12{γ} {} 1.12 51%
67 Ga 67 Ga size 12{rSup { size 8{ 67 {}} }Ga} {} 78.3 h EC     γ s γ s size 12{γs} {} 0.0933 70%
            0.185 35%
            0.300 19%
            others  
75 Se 75 Se size 12{rSup { size 8{ 75 {}} }Se} {} 118.5 d EC     γ s γ s size 12{γs} {} 0.121 20%
            0.136 65%
            0.265 68%
            0.280 20%
            others  
86 Rb 86 Rb size 12{rSup { size 8{ 86 {}} }Rb} {} 18.8 d β s β s size 12{β rSup { size 8{ - {}} } s} {} 0.69 9% γ γ size 12{γ} {} 1.08 9%
      1.77 91%      
85 Sr 85 Sr size 12{rSup { size 8{ 85 {}} }Sr} {} 64.8 d EC     γ γ size 12{γ} {} 0.514 100%
90 Sr 90 Sr size 12{rSup { size 8{ 90 {}} }Sr} {} 28.8 y ββ size 12{β rSup { size 8{ - {}} } } {} ­ 0.546 100%      
90 Y 90 Y size 12{rSup { size 8{ 90 {}} }Y} {} 64.1 h ββ size 12{β rSup { size 8{ - {}} } } {} ­ 2.28 100%      
99m Tc 99m Tc size 12{rSup { size 8{ 99m {}} }Tc} {} 6.02 h IT     γ γ size 12{γ} {} 0.142 100%
113m In 113m In size 12{rSup { size 8{ 113m {}} }In} {} 99.5 min IT     γ γ size 12{γ} {} 0.392 100%
123 I 123 I size 12{rSup { size 8{ 123 {}} }I} {} 13.0 h EC     γ γ size 12{γ} {} 0.159 ≈100% ≈100% size 12{ approx "100"%} {}
131 I 131 I size 12{rSup { size 8{ 131 {}} }I} {} 8.040 d β s β s size 12{β rSup { size 8{ - {}} } s} {} 0.248 7% γ s γ s size 12{γs} {} 0.364 85%
      0.607 93%   others  
      others        
129 Cs 129 Cs size 12{rSup { size 8{ 129 {}} }Cs} {} 32.3 h EC     γ s γ s size 12{γs} {} 0.0400 35%
            0.372 32%
            0.411 25%
            others  
137 Cs 137 Cs size 12{rSup { size 8{ 137 {}} }Cs} {} 30.17 y βsβs size 12{β rSup { size 8{ - {}} } s} {} ­ 0.511 95% γ γ size 12{γ} {} 0.662 95%
      1.17 5%      
140 Ba 140 Ba 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"%} {} γ s γ s size 12{γs} {} 0.030 25%
            0.044 65%
            0.537 24%
            others  
198 Au 198 Au size 12{rSup { size 8{ 198 {}} }Au} {} 2.696 d ββ size 12{β rSup { size 8{ - {}} } } {} ­ 1.161 ≈100% ≈100% size 12{ approx "100"%} {} γ γ size 12{γ} {} 0.412 ≈100% ≈100% size 12{ approx "100"%} {}
197 Hg 197 Hg size 12{rSup { size 8{ 197 {}} }Hg} {} 64.1 h EC     γ γ size 12{γ} {} 0.0733 100%
210 Po 210 Po size 12{rSup { size 8{ 210 {}} }Po} {} 138.38 d α α size 12{α} {} 5.41 100%      
226 Ra 226 Ra size 12{rSup { size 8{ 226 {}} }Ra} {} 1 . 60 × 10 3 y 1 . 60 × 10 3 y size 12{1 "." "60" times "10" rSup { size 8{3} } y} {} α s α s size 12{αs} {} 4.68 5% γ γ size 12{γ} {} 0.186 100%
      4.87 95%      
235 U 235 U size 12{rSup { size 8{ 6 {}} }Li} {} 7 . 038 × 10 8 y 7 . 038 × 10 8 y size 12{7 "." "038" times "10" rSup { size 8{8} } y} {} α α size 12{α} {} 4.68 ≈100% ≈100% size 12{ approx "100"%} {} γ s γ s size 12{γs} {} numerous <0.400%
238 U 238 U size 12{rSup { size 8{ 6 {}} }Li} {} 4 . 468 × 10 9 y 4 . 468 × 10 9 y size 12{4 "." "468" times "10" rSup { size 8{9} } y} {} α s α s size 12{αs} {} 4.22 23% γ γ size 12{γ} {} 0.050 23%
      4.27 77%      
237 Np 237 Np size 12{rSup { size 8{ 237 {}} }Np} {} 2 . 14 × 10 6 y 2 . 14 × 10 6 y size 12{2 "." "14" times "10" rSup { size 8{6} } y} {} α s α s size 12{αs} {} numerous   γ s γ s size 12{γs} {} numerous <0.250%
      4.96 (max.)        
239 Pu 239 Pu size 12{rSup { size 8{ 239 {}} }Pu} {} 2 . 41 × 10 4 y 2 . 41 × 10 4 y size 12{2 "." "41" times "10" rSup { size 8{4} } y} {} α s α s size 12{αs} {} 5.19 11% γ s γ s size 12{γs} {} 7 . 5 × 10 5 7 . 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  
243 Am 243 Am size 12{rSup { size 8{ 243 {}} }Am} {} 7 . 37 × 10 3 y 7 . 37 × 10 3 y size 12{7 "." "37" times "10" rSup { size 8{3} } y} {} α s α s size 12{αs} {} Max. 5.44   γ s γ s size 12{γs} {} 0.075  
      5.37 88%   others  
      5.32 11%      
      others        

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