Thorium-230 is a radioactive isotope of thorium, a naturally occurring element. It has a half-life of about 75,000 years, which means it takes that long for half of a sample to decay. Thorium-230 is produced from the decay of uranium-234 and is found in trace amounts in natural uranium ores. This isotope is significant in the study of geochronology, as it helps scientists date geological formations and archaeological artifacts. Its decay products, including radon-222, can also be important in understanding environmental and health impacts related to radioactive materials.