# Shared Flashcard Set

## Details

15
Physics
Professional
07/01/2011

Term
Definition
 Radioactivity (Radioactive Decay) – Is Spontaneous Emission of Particles and/or electromagnetic (EM) rays.
Term
 Define parent nuclide.
Definition
 Parent Nuclide – nucleus, which decays.
Term
 Define daughter nuclide.
Definition
 Daughter Nuclide – nucleus formed following the decay event.
Term
Definition
 Natural Radioactivity – occurs from naturally occurring nuclides.
Term
 Define decay rate.
Definition
 The number of atom disintegrations occurring per unit time.
Term
 List eight (8) general mechanisms of radioactive decay.
Definition
 Radioactive Decay Mechanisms:a. Alpha decayb. Beta decayc. Positron decayd. Electron capture (K capture)e. Photon decayf. Internal conversiong. Neutron emissionh. Proton decay
Term
 Define decay constant and give equation.
Definition
 Decay Constant (λ, Greek Letter Lambda)a. Average rate of disintegration for a particular isotope, or probability that any of a number (N) of atoms of anisotope will decay in a certain time period.λ=(ln2)/(t1/2)
Term
 Define activity.
Definition
 Rate at which radioactive disintegrations occur.
Term
 Define half-life and give equation.
Definition
 Half-Life (t1/2):a. Time required for the number of atoms present in a sample of isotope to decay to one-half its value.b. For a given isotope, t1/2 is constant.t1/2= ln2/λ
Term
 Define Curie.
Definition
 Curie (Ci) - amount of any radioisotope that has 3.7 x 10^10 atoms disintegrating per second.(Most common unit of activity)
Term
 Write the formula whichdefines activity in terms of theamount of material at an instantand the activity constant.
Definition
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Term
 Write the formula which expresses the amount of material remaining after a period of time.
Definition
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Term
 Define specific activity.
Definition
 Specific Activity (SA): Number of curies per unit mass or volume (Used to describe the activity per unit mass)
Term
 Define decay chain.
Definition
 The path a radioactive isotope may take during decay.
Term
 Define compound decay.
Definition
 Compound decay indicates that a radioisotope requires multiple decays to reach stability
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