Term
|
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
|
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
|
Definition
| a radioactive isotope produced solely by human activity |
|
|
Term
|
Definition
| the conversion of one element to another either naturally or artificially |
|
|
Term
|
Definition
| any element with an atomic number greater than 92 (uranium) |
|
|
