Radioactive dating for middle school - Radiometric Dating - Tulane University


Iodine-131 can be "seen" by nuclear medicine imaging techniques (., gamma cameras ) whenever it is given for therapeutic use, since about 10% of its energy and radiation dose is via gamma radiation. However, since the other 90% of radiation (beta radiation) causes tissue damage without contributing to any ability to see or "image" the isotope, other less-damaging radioisotopes of iodine such as iodine-123 (see isotopes of iodine ) are preferred in situations when only nuclear imaging is required. The isotope I-131 is still occasionally used for purely diagnostic (., imaging) work, due to its low expense compared to other iodine radioisotopes. Very small medical imaging doses of I-131 have not shown any increase in thyroid cancer. The low-cost availability of I-131, in turn, is due to the relative ease of creating I-131 by neutron bombardment of natural tellurium in a nuclear reactor, then separating I-131 out by various simple methods (., heating to drive off the volatile iodine). By contrast, other iodine radioisotopes are usually created by far more expensive techniques, starting with reactor radiation of expensive capsules of pressurized xenon gas.

Electron ( �/em> - ) emission is literally the process in which an electron is ejected or emitted from the nucleus. When this happens, the charge on the nucleus increases by one. Electron ( �/i> - ) emitters are found throughout the periodic table, from the lightest elements ( 3 H) to the heaviest ( 255 Es). The product of �/i> - -emission can be predicted by assuming that both mass number and charge are conserved in nuclear reactions. If 40 K is a �/i> - -emitter, for example, the product of this reaction must be 40 Ca.


Radioactive dating for middle school

Radioactive dating for middle school