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Unit 6 Section C Vocabulary
Using Radioactivity
7
Chemistry
10th Grade
07/20/2012

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Term
half-life
Definition
the time for a radioactive substance to lose half of its radioactivity from decay; at the end of one half-life, 50% of the original radioisotope remains
Term
positron emission tomography (PET)
Definition
a technique for examining metabolic activity in tissues (particularly in the brain) by measuring blood flow containing tracers that emit positrons
Term
positrons
Definition
a positively charged subatomic particle with the same mass as an electron; the antimatter counterpart to the electron
Term
Magnetic resonance imaging (MRI)
Definition
a non-invasive computerized method of imaging soft human tissues by use of a powerful magnet and radio waves
Term
synthetic radioisotope
Definition
a radioactive isotope produced solely by human activity
Term
transmutation
Definition
the conversion of one element to another either naturally or artificially
Term
transuranium element
Definition
any element with an atomic number greater than 92 (uranium)
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