Uses of radioisotopes carbon dating

The rate of iodine-131 uptake, determined with a Geiger counter or other scanning device, indicates whether the thyroid glands are functioning properly.Sodium chloride containing sodium-24, can be injected into the bloodstream to study blood circulation. The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.Libby received the Nobel Prize in Chemistry for his work in 1960.This makes food safer and also keeps it fresh longer.Significant progress has been made in this field of study since the discovery of radioactivity and its properties. Recalling that all biologic organisms contain a given concentration of carbon-14, we can use this information to help solve questions about when the organism died. When an organism dies it has a specific ratio by mass of carbon-14 to carbon-12 incorporated in the cells of it's body.

PET scans have been used to study the effects of drugs on cancers, to measure damage in victims of stroke or heart attack, and to study chemical changes that occur during epileptic seizures..Some materials that do not contain carbon, like clay pots, can be dated if they were fired in an oven (burnt) and contain carbon as a result of this.It should be noted that it is not the artefact that is being dated, it is the soot, ash or charring.Remembering that the half-life of carbon-14 is 5700 years, then after 5700 years half as much carbon-14 remains within the organism.Glucose tagged with carbon-11 (half-life, 20.3 minutes and positron decay mode) circulates through the body, and the positrons emitted in the heart, brain or some other organ are monitored by a PET detector.

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