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Chapter 4
Key Terms and Concepts
21
Chemistry
Undergraduate 1
03/11/2012

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Term
alpha particle
Definition
A nuclear particle identical to a helium nucleus with symbol α or 24He
Term
becquerel (Bq)
Definition
A unit of activity of a radioactive sample equal to one disintegration per second
Term
beta particle
Definition
A particle identical to an electron with symbol β or -10e that forms in the nucleus when a neutron changes to a proton and an electron
Term
carbon dating
Definition
A technique used to date ancient specimens that contain carbon. The age is determined by the amount of active carbon-14 that remains in the samples
Term
chain reaction
Definition
A fission reaction that will continue once it has been initiated by a high-energy neutron bombarding a heavy nucleus such as uranium-235
Term
curie (Ci)
Definition
A unit of radiation equal to 3.7 x 1010 disintegrations/s
Term
decay curve
Definition
A diagram of the decay of a radioactive element
Term
equivalent dose
Definition
The measure of biological damage from an absorbed dose that has been adjusted for the type of radiation
Term
fission
Definition
A process in which large nuclei are split into smaller pieces, releasing large amounts of energy
Term
fusion
Definition
A reaction in which large amounts of energy are released when small nuclei combine to form larger nuclei
Term
gamma ray
Definition
High-energy radiation (with symbol 00γ) that is emitted by an unstable nucleus
Term
gray (Gy)
Definition
A unit of absorbed dose equal to 100 rads
Term
half-life
Definition
The length of time it takes for one-half of a radioactive sample to decay
Term
positron
Definition
A particle with no mass and a positive charge produced when a proton is transformed into a neutron and a positron
Term
rad (radiation absorbed dose)
Definition
a measure of an amount of radiation absorbed by the body
Term
Radiation
Definition
Energy or particles released by radioactive atoms
Term
radioactive decay
Definition
The process by which an unstable nucleus breaks down and releases high-energy radiation
Term
rem (radiation equivalent in humans)
Definition
A measure of the biological damage caused by the various kinds of radiation (rad x radiation biological factor)
Term
scan
Definition
The image of a site in the body created by the detection of radiation from radioactive isotopes that have accumulated in that site
Term
shielding
Definition
Materials used to provide protection from radioactive sources
Term
sievert (Sv)
Definition
A unit of biological damage (equivalent dose) equal to 100 rems
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