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{{Nuclear physics}}
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The '''decay energy''' is the [[energy]] released by a [[radioactive decay]]. Radioactive decay is the process in which an unstable [[atomic nucleus]] loses energy by emitting ionizing particles and [[radiation]]. This decay, or loss of energy, results in an atom of one type, called the parent [[nuclide]] transforming to an atom of a different type, called the daughter nuclide.
 
==Decay calculation==
The energy difference of the [[reactant]]s is often written as ''Q'':
 
<math>Q = (\text{Kinetic energy})_{\text{after}} - (\text{Kinetic energy})_{\text{before}}\,\!</math>
<math>Q = ((\text{Rest mass})_{\text{before}} \times c^2) - ((\text{Rest mass})_{\text{after}} \times c^2)\,\!</math>
 
Decay energy is usually quoted in terms of the energy units '''MeV''' (million [[electronvolt]]s) or '''KeV''' (thousand electronvolts).
 
Types of radioactive decay include
* [[gamma ray]]
* [[beta decay]] (decay energy is divided between the emitted [[electron]] and the [[neutrino]] which is emitted at the same time)
* [[alpha decay]]
 
The decay energy is the mass difference ''dm'' between the parent and the daughter atom and particles. It is equal to the energy of radiation ''E''. If ''A'' is the [[Radioactive_decay#Radioactive_decay_rates|radioactive activity]], i.e. the number of transforming atoms per time, ''M'' the molar mass, then the radiation power ''W'' is:
<math>W = dm \times \left ( \frac{A}{M} \right )\,\!</math>
or
<math>W = E \times \left ( \frac{A}{M} \right )\,\!</math>
 
Example: [[Cobalt-60|<sup>60</sup>Co]] decays into <sup>60</sup>Ni. The mass difference ''dm'' is 0.003[[Atomic mass unit|u]]. The radiated energy is approximately 2.8 MeV. The molar weight is 59.93. The half life ''T'' of 5.7a corresponds to the activity A=(N*(-ln(2)))/T, where N is the number of atoms per mol. Taking care of the units the radiation power for <sup>60</sup>Co is 17.9 W/g
 
Radiation power in ''W/g'' for several isotopes:
: <sup>60</sup>Co: 17.9
: <sup>238</sup>Pu: 0.57
: <sup>137</sup>Cs: 0.6
: <sup>241</sup>Am: 0.1
: <sup>210</sup>Po: 140 (T=136 d)
: <sup>90</sup>Sr: 0.9
 
==References==
[http://www.nucleonica.net/nuclTxtbook.aspx Radioactivity Radionuclides Radiation by Joseph Magill and Jean Galy, Springer Verlag, 2005]
 
==External links==
*[http://www.science.uwaterloo.ca/~cchieh/cact/nuctek/decayenergy.html University of Waterloo science]
 
{{phys-stub}}
[[Category:Nuclear physics]]

Latest revision as of 16:46, 23 December 2014

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