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

Selected radioactive isotopes
Isotope t 1/2 DecayMode(s) Energy(MeV) Percent γ size 12{γ} {} -Ray Energy(MeV) Percent
3 H size 12{rSup { size 8{ 3 {}} }H} {} 12.33 y β size 12{β rSup { size 8{ - {}} } } {} ­ 0.0186 100%
14 C size 12{rSup { size 8{ 6 {}} }Li} {} 5730 y β size 12{β rSup { size 8{ - {}} } } {} 0.156 100%
13 N size 12{rSup { size 8{ 13 {}} }N} {} 9.96 min β + size 12{β rSup { size 8{+{}} } } {} 1.20 100%
22 Na size 12{rSup { size 8{ 6 {}} }Li} {} 2.602 y β + size 12{β rSup { size 8{+{}} } } {} 0.55 90% γ size 12{γ} {} 1.27 100%
32 P size 12{rSup { size 8{ 32 {}} }P} {} 14.28 d β size 12{β rSup { size 8{ - {}} } } {} 1.71 100%
35 S size 12{rSup { size 8{ 35 {}} }S} {} 87.4 d β size 12{β rSup { size 8{ - {}} } } {} ­ 0.167 100%
36 Cl size 12{rSup { size 8{ 36 {}} }Cl} {} 3 . 00 × 10 5 y size 12{3 "." "00" times "10" rSup { size 8{5} } y} {} β size 12{β rSup { size 8{ - {}} } } {} 0.710 100%
40 K size 12{rSup { size 8{ 40 {}} }K} {} 1 . 28 × 10 9 y size 12{1 "." "28" times "10" rSup { size 8{9} } y} {} β size 12{β rSup { size 8{ - {}} } } {} 1.31 89%
43 K size 12{rSup { size 8{ 43 {}} }K} {} 22.3 h β size 12{β rSup { size 8{ - {}} } } {} 0.827 87% γ s size 12{γs} {} 0.373 87%
0.618 87%
45 Ca size 12{rSup { size 8{ 6 {}} }Li} {} 165 d β size 12{β rSup { size 8{ - {}} } } {} ­ 0.257 100%
51 Cr size 12{rSup { size 8{ 51 {}} }Cr} {} 27.70 d EC γ size 12{γ} {} 0.320 10%
52 Mn size 12{rSup { size 8{ 52 {}} }Mn} {} 5.59d β + size 12{β rSup { size 8{+{}} } } {} 3.69 28% γ s size 12{γs} {} 1.33 28%
1.43 28%
52 Fe size 12{rSup { size 8{ 52 {}} }Fe} {} 8.27 h β + size 12{β rSup { size 8{+{}} } } {} 1.80 43% 0.169 43%
0.378 43%
59 Fe size 12{rSup { size 8{ 59 {}} }Fe} {} 44.6 d β s size 12{β rSup { size 8{ - {}} } s} {} 0.273 45% γ s size 12{γs} {} 1.10 57%
0.466 55% 1.29 43%
60 Co size 12{rSup { size 8{ 60 {}} }Co} {} 5.271 y β size 12{β rSup { size 8{ - {}} } } {} ­ 0.318 100% γ s size 12{γs} {} 1.17 100%
1.33 100%
65 Zn size 12{rSup { size 8{ 65 {}} }Zn} {} 244.1 d EC γ size 12{γ} {} 1.12 51%
67 Ga size 12{rSup { size 8{ 67 {}} }Ga} {} 78.3 h EC γ s size 12{γs} {} 0.0933 70%
0.185 35%
0.300 19%
others
75 Se size 12{rSup { size 8{ 75 {}} }Se} {} 118.5 d EC γ s size 12{γs} {} 0.121 20%
0.136 65%
0.265 68%
0.280 20%
others
86 Rb size 12{rSup { size 8{ 86 {}} }Rb} {} 18.8 d β s size 12{β rSup { size 8{ - {}} } s} {} 0.69 9% γ size 12{γ} {} 1.08 9%
1.77 91%
85 Sr size 12{rSup { size 8{ 85 {}} }Sr} {} 64.8 d EC γ size 12{γ} {} 0.514 100%
90 Sr size 12{rSup { size 8{ 90 {}} }Sr} {} 28.8 y β size 12{β rSup { size 8{ - {}} } } {} ­ 0.546 100%
90 Y size 12{rSup { size 8{ 90 {}} }Y} {} 64.1 h β size 12{β rSup { size 8{ - {}} } } {} ­ 2.28 100%
99m Tc size 12{rSup { size 8{ 99m {}} }Tc} {} 6.02 h IT γ size 12{γ} {} 0.142 100%
113m In size 12{rSup { size 8{ 113m {}} }In} {} 99.5 min IT γ size 12{γ} {} 0.392 100%
123 I size 12{rSup { size 8{ 123 {}} }I} {} 13.0 h EC γ size 12{γ} {} 0.159 ≈100% size 12{ approx "100"%} {}
131 I size 12{rSup { size 8{ 131 {}} }I} {} 8.040 d β s size 12{β rSup { size 8{ - {}} } s} {} 0.248 7% γ s size 12{γs} {} 0.364 85%
0.607 93% others
others
129 Cs size 12{rSup { size 8{ 129 {}} }Cs} {} 32.3 h EC γ s size 12{γs} {} 0.0400 35%
0.372 32%
0.411 25%
others
137 Cs size 12{rSup { size 8{ 137 {}} }Cs} {} 30.17 y β s size 12{β rSup { size 8{ - {}} } s} {} ­ 0.511 95% γ size 12{γ} {} 0.662 95%
1.17 5%
140 Ba size 12{rSup { size 8{ 140 {}} }Ba} {} 12.79 d β size 12{β rSup { size 8{ - {}} } } {} 1.035 ≈100% size 12{ approx "100"%} {} γ s size 12{γs} {} 0.030 25%
0.044 65%
0.537 24%
others
198 Au size 12{rSup { size 8{ 198 {}} }Au} {} 2.696 d β size 12{β rSup { size 8{ - {}} } } {} ­ 1.161 ≈100% size 12{ approx "100"%} {} γ size 12{γ} {} 0.412 ≈100% size 12{ approx "100"%} {}
197 Hg size 12{rSup { size 8{ 197 {}} }Hg} {} 64.1 h EC γ size 12{γ} {} 0.0733 100%
210 Po size 12{rSup { size 8{ 210 {}} }Po} {} 138.38 d α size 12{α} {} 5.41 100%
226 Ra size 12{rSup { size 8{ 226 {}} }Ra} {} 1 . 60 × 10 3 y size 12{1 "." "60" times "10" rSup { size 8{3} } y} {} α s size 12{αs} {} 4.68 5% γ size 12{γ} {} 0.186 100%
4.87 95%
235 U size 12{rSup { size 8{ 6 {}} }Li} {} 7 . 038 × 10 8 y size 12{7 "." "038" times "10" rSup { size 8{8} } y} {} α size 12{α} {} 4.68 ≈100% size 12{ approx "100"%} {} γ s size 12{γs} {} numerous <0.400%
238 U size 12{rSup { size 8{ 6 {}} }Li} {} 4 . 468 × 10 9 y size 12{4 "." "468" times "10" rSup { size 8{9} } y} {} α s size 12{αs} {} 4.22 23% γ size 12{γ} {} 0.050 23%
4.27 77%
237 Np size 12{rSup { size 8{ 237 {}} }Np} {} 2 . 14 × 10 6 y size 12{2 "." "14" times "10" rSup { size 8{6} } y} {} α s size 12{αs} {} numerous γ s size 12{γs} {} numerous <0.250%
4.96 (max.)
239 Pu size 12{rSup { size 8{ 239 {}} }Pu} {} 2 . 41 × 10 4 y size 12{2 "." "41" times "10" rSup { size 8{4} } y} {} α s size 12{αs} {} 5.19 11% γ s size 12{γs} {} 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 size 12{rSup { size 8{ 243 {}} }Am} {} 7 . 37 × 10 3 y size 12{7 "." "37" times "10" rSup { size 8{3} } y} {} α s size 12{αs} {} Max. 5.44 γ s size 12{γs} {} 0.075
5.37 88% others
5.32 11%
others

Questions & Answers

what is Andromeda
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what is velocity
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displacement per unit time
Murlidhar
the ratec of displacement over time
Jamie
the rate of displacement over time
Jamie
the rate of displacement over time
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did you need it right now
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up to tomorrow
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i need a description and derivation of kinetic theory of gas
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pls the sum of change in kinetic and potential energy is always what ?
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i need a description and derivation of kinetic theory of gas
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did you need it right now
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A few grains of table salt were put in a cup of cold water kept at constant temperature and left undisturbed. eventually all the water tasted salty. this is due to?
Faith Reply
Aunt Faith,please i am thinking the dissolution here from the word "solution" exposed the grains of salt to be dissolved in the water.Thankyou
Junior
dissolution please
Junior
Aunt Faith,please i am thinking the dissolution here from the word "solution" exposed the grains of salt to be dissolved in the water.Thankyou
Junior
it is either diffusion or osmosis. just confused
Faith
due to solvation....
Pathani
what is solvation pls
Faith
water molecule surround the salt molecules . solute solute attraction break in the same manner solvent solvent interaction also break. as a result solute and solvent attraction took place.
Pathani
okay thanks
Faith
my pleasure
Pathani
what is solvation pls
Faith
water act as a solvent and salt act as solute
Pathani
okay thanks
Faith
its ok
Pathani
due to solvation....
Pathani
water molecule surround the salt molecules . solute solute attraction break in the same manner solvent solvent interaction also break. as a result solute and solvent attraction took place.
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what is magnetism
Eze Reply
physical phenomena arising from force caused by magnets
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is the phenomenon of attracting magnetic substance like iron, cobalt etc.
Faith
what is heat
John Reply
Heat is a form of energy where molecules move
saran
Can you please help me with some questions
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topic-- question
Salman
I know this is unrelated to physics, but how do I get the MCQs and essay to work. they arent clickable.
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20cm3 of 1mol/dm3 solution of a monobasic acid HA and 20cm3 of 1mol/dm3 solution of NaOH are mixed in a calorimeter and a temperature rise of 274K is observed. If the heat capacity of the calorimeter is 160J/K, calculate the enthalpy of neutralization of the acid.(SHCw=4.2J/g/K) Formula. (ms*cs+C)*T
Lilian Reply
why is a body moving at a constant speed able to accelerate
Lilian Reply
20cm3 of 1mol/dm3 solution of a monobasic acid HA and 20cm3 of 1mol/dm3 solution of NaOH are mixed in a calorimeter and a temperature rise of 274K is observed. If the heat capacity of the calorimeter is 160J/K, calculate the enthalpy of neutralization of the acid.(SHCw=4.2J/g/K) Formula. (ms*cs+C)*T
Lilian
because it changes only direction and the speed is kept constant
Justice
Why is the sky blue...?
Star Reply
It's filtered light from the 2 forms of radiation emitted from the sun. It's mainly filtered UV rays. There's a theory titled Scatter Theory that covers this topic
Mike
A heating coil of resistance 30π is connected to a 240v supply for 5min to boil a quantity of water in a vessel of heat capacity 200jk. If the initial temperature of water is 20°c and it specific heat capacity is 4200jkgk calculate the mass of water in a vessel
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A thin equi convex lens is placed on a horizontal plane mirror and a pin held 20 cm vertically above the lens concise in position with its own image the space between the undersurface of d lens and the mirror is filled with water (refractive index =1•33)and then to concise with d image d pin has to
Azummiri Reply
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Azummiri
what happens when a nuclear bomb and atom bomb bomb explode add the same time near each other
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A monkey throws a coconut straight upwards from a coconut tree with a velocity of 10 ms-1. The coconut tree is 30 m high. Calculate the maximum height of the coconut from the top of the coconut tree? Can someone answer my question
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