Decay product

The decay chain from lead-212 down to lead-208, showing the intermediate decay products.

Nuclear physics

Nucleus · Nucleons (p, n) · Nuclear matter · Nuclear force · Nuclear structure · Nuclear reaction
Models of the nucleus Liquid drop · Nuclear shell model · Interacting boson model · Ab initio
Nuclides' classification Isotopes – equal Z Isobars – equal A Isotones – equal N Isodiaphers – equal N − Z Isomers – equal all the above Mirror nuclei – Z ↔ N Stable · Magic · Even/odd · Halo
Nuclear stability Binding energy · p–n ratio · Drip line · Island of stability · Valley of stability
Radioactive decay Alpha α · Beta β (2β, β⁺) · K/L capture · Isomeric (Gamma γ · Internal conversion) · Spontaneous fission · Cluster decay · Neutron emission · Proton emission Decay energy · Decay chain · Decay product · Radiogenic nuclide
Nuclear fission Spontaneous · Products (pair breaking) · Photofission
Capturing processes electron · neutron (s · r) · proton (p · rp)
High energy processes Spallation (by cosmic ray) · Photodisintegration
Nucleosynthesis and nuclear astrophysics Nuclear fusion Processes: Stellar · Big Bang · Supernova Nuclides: Primordial · Cosmogenic · Artificial
High energy nuclear physics Quark–gluon plasma · RHIC · LHC
Scientists Alvarez · Becquerel · Bethe · A.Bohr · N.Bohr · Chadwick · Cockcroft · Ir.Curie · Fr.Curie · Pi.Curie · Skłodowska-Curie · Davisson · Fermi · Hahn · Jensen · Lawrence · Mayer · Meitner · Oliphant · Oppenheimer · Proca · Purcell · Rabi · Rutherford · Soddy · Strassmann · Szilárd · Teller · Thomson · Walton · Wigner

In nuclear physics, a decay product (also known as a daughter product, daughter isotope or daughter nuclide) is the remaining nuclide left over from radioactive decay. Radioactive decay often proceeds via a sequence of steps (decay chain). For example, ²³⁸U decays to ²³⁴Th which decays to ^234mPa which decays, and so on, to ²⁰⁶Pb (which is stable):

{\ce {^{238}U->\overbrace {\underbrace {^{234}Th} _{daughter~of~^{238}U}->\underbrace {^{234\!m}Pa} _{granddaughter~of~^{238}U}->\cdots ->{^{206}Pb}} ^{decay~products~of~^{238}U}}}

In this example:

²³⁴Th, ^234mPa,…,²⁰⁶Pb are the decay products of ²³⁸U.
²³⁴Th is the daughter of the parent ²³⁸U.
^234mPa (234 metastable) is the granddaughter of ²³⁸U.

These might also be referred to as the daughter products of ²³⁸U.^[1]

Decay products are important in understanding radioactive decay and the management of radioactive waste.

For elements above lead in atomic number, the decay chain typically ends with an isotope of thallium or lead.

In many cases members of the decay chain are far more radioactive than the original nuclide. Thus, although uranium is not dangerously radioactive when pure, some pieces of naturally occurring pitchblende are quite dangerous owing to their radium content. Similarly, thorium gas mantles are very slightly radioactive when new, but become far more radioactive after only a few months of storage.

Although it cannot be predicted whether any given atom of a radioactive substance will decay at any given time, the decay products of a radioactive substance are extremely predictable. Because of this, decay products are important to scientists in many fields who need to know the quantity or type of the parent product. Such studies are done to measure pollution levels (in and around nuclear facilities) and for other matters.

References

↑ Glossary of Volume 7 (Depleted Uranium — authors: Naomi H. Harley, Ernest C. Foulkes, Lee H. Hilborne, Arlene Hudson, and C. Ross Anthony) of A review of the scientific literature as it pertains to gulf war illnesses.

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Decay product

See also

References