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Home
Science
Chemistry
Radioactive Decay
Types of Radioactive Decay
Alpha decay
: the loss of an
α
-particle
α
-particle
: a helium nucleus
Beta decay
: the loss of a
β
-particle
β
-particle
: a high-energy electron
Positron emission
: the loss of a positron
Positron
: a particle that has the same mass as, but an opposite charge to, that of an electron
Gamma emission
: the loss of a
γ
-ray
γ
-ray
: high-energy radiation that almost always accompanies the loss of a nuclear particle:
Electron capture (K-capture)
: addition of an electron to a proton in the nucleus
The result of this process is that a proton is transformed into a neutron
Kinetics of Radioactive Decay
Nuclear transmutation is a first-order process.
The kinetics of such a process obey this equation:
ln(
Nt/N
0) =
−kt
Nt is the mass, or number of particles at time t.
No is the original.
The half-life of such a process is
0.693/
k=t
1/2
Comparing the amount of a radioactive nuclide present at a given point in time with the amount normally present, one can find the age of an object.
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